Publications (136)
Extraordinary epitaxial alignment of graphene islands on Au(111)
Joseph M. Wofford, Elena Starodub, Andrew L. Walter +7
Pristine, single-crystalline graphene displays a unique collection of remarkable electronic properties that arise from its two-dimensional, honeycomb structure. Using in-situ low-e…
Electronic band structure changes across the antiferromagnetic phase transition of exfoliated MnPS probed by -ARPES
Jeff Strasdas, Benjamin Pestka, Milosz Rybak +17
Exfoliated magnetic 2D materials enable versatile tuning of magnetization, e.g., by gating or providing proximity-induced exchange interaction. However, their electronic band struc…
Revealing the Electronic Structure of van der Waals Antiferromagnetic NiPS through Synchrotron-Based -ARPES and Alkali Metal Dosing
Yifeng Cao, Qishuo Tan, Yucheng Guo +13
This study presents a comprehensive analysis of the band structure in NiPS, a van der Waals layered antiferromagnet, utilizing high-resolution synchrotron-based angle-resolved…
A Novel Quasi-One-Dimensional Topological Insulator in Bismuth Iodide -BiI
Gabriel Autès, Anna Isaeva, Luca Moreschini +16
Recent progress in the field of topological states of matter(1,2) has largely been initiated by the discovery of bismuth and antimony chalcogenide bulk topological insulators (TIs)…
Giant spin-splitting and gap renormalization driven by trions in single-layer WS/h-BN heterostructures
Jyoti Katoch, Søren Ulstrup, Roland J. Koch +9
In two-dimensional (2D) semiconducting transition metal dichalcogenides (TMDs), new electronic phenomena such as tunable band gaps and strongly bound excitons and trions emerge fro…
Weyl nodal ring states and Landau quantization with very large magnetoresistance in square-net magnet EuGa
Shiming Lei, Kevin Allen, Jianwei Huang +17
Magnetic topological semimetals (TSMs) allow for an effective control of the topological electronic states by tuning the spin configuration, and therefore are promising materials f…
Antiferromagnetic metal phase in an electron-doped rare-earth nickelate
Qi Song, Spencer Doyle, Grace A. Pan +28
Long viewed as passive elements, antiferromagnetic materials have emerged as promising candidates for spintronic devices due to their insensitivity to external fields and potential…
Synthesis and physical properties of a new layered ferromagnet, Cr1.21Te2
Zhixue Shu, Haozhe Wang, Na Hyun Jo +5
Single crystals of a new layered compound, Cr1.21Te2, was synthesized via a vapor transport method. The crystal structure and physical properties were characterized by single cryst…
Enhanced tunability of two-dimensional electron gas on SrTiO3 through heterostructuring
Hyang Keun Yoo, Luca Moreschini, Andrew L. Walter +4
Two-dimensional electron gases (2DEGs) on the SrTiO3 (STO) surface or in STO-based heterostructures have exhibited many intriguing phenomena, which are strongly dependent on the 2D…
Momentum-resolved view of highly tunable many-body effects in a graphene/hBN field-effect device
Ryan Muzzio, Alfred J. H. Jones, Davide Curcio +12
Integrating the carrier tunability of a functional two-dimensional material electronic device with a direct probe of energy- and momentum-resolved electronic excitations is essenti…
Topological band inversion in HgTe(001): surface and bulk signatures from photoemission
Raphael C. Vidal, Giovanni Marini, Lukas Lunczer +14
HgTe is a versatile topological material and has enabled the realization of a variety of topological states, including two- and three-dimensional (3D) topological insulators and to…
Local interface effects modulate global charge order and optical properties of 1T-TaS/1H-WSe heterostructures
Samra HusremoviÄ, Valerie S. McGraw, Medha Dandu +14
1T-TaS is a layered charge density wave (CDW) crystal exhibiting sharp phase transitions and associated resistance changes. These resistance steps could be exploited for inform…
Spatially Resolved Electronic Properties of Single-Layer WS on Transition Metal Oxides
Søren Ulstrup, Jyoti Katoch, Roland J. Koch +10
There is a substantial interest in the heterostructures of semiconducting transition metal dichalcogenides (TMDCs) amongst each other or with arbitrary materials, through which the…
Visualization of Tunable Electronic Structure of Monolayer TaIrTe
Sandy Adhitia Ekahana, Aalok Tiwari, Souvik Sasmal +16
Monolayer TaIrTe has emerged as an attractive material platform to study intriguing phenomena related to topology and strong electron correlations. Recently, strong interaction…
Tunable Two-Dimensional Group-III Metal Alloys
Siavash Rajabpour, Alexander Vera, Wen He +20
Chemically stable quantum-confined 2D metals are of interest in next-generation nanoscale quantum devices. Bottom-up design and synthesis of such metals could enable the creation o…
Uniaxial "nematic-like" electronic structure and Fermi surface of untwinned CaFe2As2
Qiang Wang, Zhe Sun, Eli Rotenberg +8
Obtaining the electronic structure of the newly discovered iron-based superconductors is the key to understanding the mechanism of their high-temperature superconductivity. We used…
Epitaxial Kagome Thin Films as a Platform for Topological Flat Bands
Shuyu Cheng, M. Nrisimhamurty, Tong Zhou +10
Systems with flat bands are ideal for studying strongly correlated electronic states and related phenomena. Among them, kagome-structured metals such as CoSn have been recognized a…
Spin-polarised surface fermiology of ohmic WSe/NbSe interfaces
Oliver J. Clark, Thi-Hai-Yen Vu, Ben A. Chambers +9
Discovering and engineering spin-polarised surface states in the electronic structures of condensed matter systems is a crucial first step in development of spintronic devices, whe…
Spatiotemporal Imaging of Thickness-Induced Band Bending Junctions
Joeson Wong, Artur R. Davoyan, Bolin Liao +8
Van der Waals materials exhibit naturally passivated surfaces and can form versatile heterostructures, enabling observation of carrier transport mechanisms not seen in three-dimens…
Emergence of excitonic superfluid at topological-insulator surfaces
Yasen Hou, Rui Wang, Rui Xiao +11
Excitons are spin integer particles that are predicted to condense into a coherent quantum state at sufficiently low temperature, and exciton condensates can be realized at much hi…
Pseudogap in a crystalline insulator doped by disordered metals
Sae Hee Ryu, Minjae Huh, Do Yun Park +4
A key to understand how electrons behave in crystalline solids is the band structure that connects the energy of electron waves to their wavenumber (k). Even in the phase of matter…
Spin-Polarized Standing Waves in the Fermi Surface of a Ferromagnetic Thin Film
J. Schaefer, M. Hoinkis, Eli Rotenberg +2
The spin-selective electron reflection at a ferromagnetic-paramagnetic interface is investigated using Fe films on a W(110) substrate. Angle-resolved photoemission of the majority…
Spectral Evidence for Local-Moment Ferromagnetism in van der Waals Metals FeGaTe and FeGeTe
Han Wu, Chaowei Hu, Yaofeng Xie +26
Magnetism in two-dimensional (2D) materials has attracted considerable attention recently for both fundamental understanding of magnetism and their tunability towards device applic…
p-Wave Orbital Angular Momentum Texture in a Chiral Crystal
Dongjin Oh, Chiara Pacella, Xiangyu Luo +8
The spin and orbital angular momentum (SAM and OAM) are conceptually analogous, yet their roles in condensed matter systems have not been often treated on equal footing. While SAM…
Controlling spin-orbit coupling to tailor type-II Dirac bands
Nguyen Huu Lam, Phuong Lien Nguyen, Byoung Ki Choi +12
NiTe2, a type-II Dirac semimetal with strongly tilted Dirac band, has been explored extensively to understand its intriguing topological properties. Here, using density-functional…
Electronic structure of a Si-containing topological Dirac semimetal CaAl2Si2
Tao Deng, Cheng Chen, Hao Su +17
There has been an upsurge in the discovery of topological quantum materials, where various topological insulators and semimetals have been theoretically predicted and experimentall…
Photo-physics and electronic structure of lateral graphene/MoS2 and metal/MoS2 junctions
Shruti Subramanian, Quinn T. Campbell, Simon Moser +18
Integration of semiconducting transition metal dichalcogenides (TMDs) into functional optoelectronic circuitries requires an understanding of the charge transfer across the interfa…
Morphology of graphene thin film growth on SiC(0001)
Taisuke Ohta, Farid El Gabaly, Aaron Bostwick +6
Epitaxial films of graphene on SiC(0001) are interesting from a basic physics as well as applications-oriented point of view. Here we study the emerging morphology of in-vacuo prep…
Dark states of electrons in a quantum system with two pairs of sublattices
Yoonah Chung, Minsu Kim, Yeryn Kim +14
A quantum state of matter that is forbidden to interact with photons and is therefore undetectable by spectroscopic means is called a dark state. This basic concept can be applied…
Bulk Superconductivity driven by Disorder-Induced Delocalization in 4Hb-Ta(SSe)
Lu Chen, Sae-Hee Ryu, Avior Almoalem +10
The unconventional superconductor 4Hb-TaS is a natural heterostructure that can be broadly understood as interleaving Mott-like and metallic layers. We study the properties of…
Large Exciton Binding Energy in the Bulk van der Waals Magnet CrSBr
Shane Smolenski, Ming Wen, Qiuyang Li +13
Excitons, bound electron-hole pairs, influence the optical properties in strongly interacting solid state systems. Excitons and their associated many-body physics are typically mos…
Intrinsic Insulating Ground State in Transition Metal Dichalcogenide TiSe2
Daniel J. Campbell, Chris Eckberg, Peter Y. Zavalij +8
The transition metal dichalcogenide TiSe has received significant research attention over the past four decades. Different studies have presented ways to suppress the 200~K cha…
Visualizing band structure hybridization and superlattice effects in twisted MoS/WS heterobilayers
Alfred J. H. Jones, Ryan Muzzio, Sahar Pakdel +16
A mismatch of atomic registries between single-layer transition metal dichalcogenides (TMDs) in a two dimensional van der Waals heterostructure produces a moiré superlattice with…
Massive Dirac fermions in a ferromagnetic kagome metal
Linda Ye, Mingu Kang, Junwei Liu +10
The kagome lattice is a two-dimensional network of corner-sharing triangles known as a platform for exotic quantum magnetic states. Theoretical work has predicted that the kagome l…
Van Hove Singularity and Apparent Anisotropy in the Electron-Phonon Interaction in Graphene
Cheol-Hwan Park, Feliciano Giustino, Jessica L. McChesney +5
We show that the electron-phonon coupling strength obtained from the slopes of the electronic energy vs. wavevector dispersion relations, as often done in analyzing angle-resolved…
Direct observation of distinct minibands in moiré superlattices
Saien Xie, Brendan D. Faeth, Yanhao Tang +10
Moiré superlattices comprised of stacked two-dimensional materials present a versatile platform for engineering and investigating new emergent quantum states of matter. At present…
Strain-tunability of the multipolar Berry curvature in altermagnet MnTe
Shane Smolenski, Ning Mao, Dechen Zhang +15
The anomalous Hall effect describes the generation of a transverse voltage by a longitudinal current even in the absence of an external magnetic field. While typically observed in…
A flat band-induced correlated kagome metal
Linda Ye, Shiang Fang, Min Gu Kang +11
The notion of an electronic flat band refers to a collectively degenerate set of quantum mechanical eigenstates in periodic solids. The vanishing kinetic energy of flat bands relat…
Direct observation of minibands in twisted heterobilayers
Søren Ulstrup, Roland J. Koch, Simranjeet Singh +8
Stacking two-dimensional (2D) van der Waals materials with different interlayer atomic registry in a heterobilayer causes the formation of a long-range periodic superlattice that m…
Structure and Correlation Effects in Semiconducting SrTiO
Young Jun Chang, Aaron Bostwick, Yong Su Kim +2
We have investigated the effects of structure change and electron correlation on SrTiO single crystals using angle-resolved photoemission spectroscopy. We show that the cubic…
Microscopy of hydrogen and hydrogen-vacancy defect structures on graphene devices
Dillon Wong, Yang Wang, Wuwei Jin +8
We have used scanning tunneling microscopy (STM) to investigate two types of hydrogen defect structures on monolayer graphene supported by hexagonal boron nitride (h-BN) in a gated…
Intertwined magnetism and charge density wave order in kagome FeGe
Xiaokun Teng, Ji Seop Oh, Hengxin Tan +15
Electron correlations often lead to emergent orders in quantum materials. Kagome lattice materials are emerging as an exciting platform for realizing quantum topology in the presen…
Scanning tunneling spectroscopy of inhomogeneous electronic structure in monolayer and bilayer graphene on SiC
Victor W. Brar, Yuanbo Zhang, Yossi Yayon +6
We present a scanning tunneling spectroscopy (STS) study of the local electronic structure of single and bilayer graphene grown epitaxially on a SiC(0001) surface. Low voltage topo…
Phason-mediated interlayer exciton diffusion in WS2/WSe2 moiré heterostructure
Antonio Rossi, Jonas Zipfel, Indrajit Maity +13
Moiré potentials in two-dimensional materials have been proven to be of fundamental importance to fully understand the electronic structure of van der Waals heterostructures, from…
Direct visualization of the charge transfer in Graphene/-RuCl heterostructure
Antonio Rossi, Riccardo Dettori, Cameron Johnson +13
We investigate the electronic properties of a graphene and -ruthenium trichloride (hereafter RuCl) heterostructure, using a combination of experimental and theoretical tech…
Tailored topotactic chemistry unlocks heterostructures of magnetic intercalation compounds
Samra HusremoviÄ, Oscar Gonzalez, Berit H. Goodge +15
The construction of thin film heterostructures has been a widely successful archetype for fabricating materials with emergent physical properties. This strategy is of particular im…
Magnetic-Order Induced Spectral-Weight Redistribution in a Triangular Surface System
Gang Li, Philipp Höpfner, Jörg Schäfer +6
The Sn-induced surface reconstruction on Si(111) has been investigated by material-specific many-body calculations and by angle-resolved photoelectron spectr…
Visualization of Strain-Induced Landau Levels in a Graphene - Black Phosphorus Heterostructure
Thi-Hai-Yen Vu, Pin Lyu, Na Hyun Jo +8
Strain-induced pseudo magnetic fields offer the possibility of realizing zero magnetic field Quantum Hall effect in graphene, possibly up to room temperature, representing a promis…
Nature of charge density wave in kagome metal ScV6Sn6
Seongyong Lee, Choongjae Won, Jimin Kim +9
Kagome lattice materials offer a fertile ground to discover novel quantum phases of matter, ranging from unconventional superconductivity and quantum spin liquids to charge orders…
Good plasmons in a bad metal
Francesco L. Ruta, Yinming Shao, Swagata Acharya +12
Correlated materials may exhibit unusually high resistivity increasing linearly in temperature, breaking through the Mott-Ioffe-Regel bound, above which coherent quasiparticles are…
Universal Mechanism of Band-Gap Engineering in Transition-Metal Dichalcogenides
Mingu Kang, Beomyoung Kim, Sae Hee Ryu +7
Two-dimensional (2D) van-der-Waals semiconductors have emerged as a class of materials with promising device characteristics owing to the intrinsic bandgap. For realistic applicati…
Electronic Structure of Exfoliated and Epitaxial Hexagonal Boron Nitride
Roland J. Koch, Jyoti Katoch, Simon Moser +6
Hexagonal boron nitride (hBN) is an essential component in van der Waals heterostructures as it provides high quality and weakly interacting interfaces that preserve the electronic…
Orbital-selective metal skin induced by alkali-metal-dosing Mott-insulating CaRuO
M. Horio, F. Forte, D. Sutter +21
Doped Mott insulators are the starting point for interesting physics such as high temperature superconductivity and quantum spin liquids. For multi-band Mott insulators, orbital se…
Electrically tunable interfacial thermal conduction via electronic structure engineering in / topological insulators
Min Young Kim, Joon Sang Kang, Jangwoo Ha +8
This work provides direct experimental evidence for the role of topological interface states in thermal conduction across a metal/topological insulator junction. It also shows that…
Ultrafast triggering of insulator-metal transition in two-dimensional VSe
Deepnarayan Biswas, Alfred J. H. Jones, Paulina Majchrzak +24
Assembling transition metal dichalcogenides (TMDCs) at the two-dimensional (2D) limit is a promising approach for tailoring emerging states of matter such as superconductivity or c…
The Dirac nodal line network in non-symmorphic rutile semimetal RuO
Vedran Jovic, Roland J. Koch, Swarup K. Panda +11
We employ angle resolved photoemission spectroscopy (ARPES) to investigate the Fermi surface of RuO. We find a network of two Dirac nodal lines (DNL) as previously predicted in…
Autonomous Investigations over WS and Au{111} with Scanning Probe Microscopy
John C. Thomas, Antonio Rossi, Darian Smalley +14
Individual atomic defects in 2D materials impact their macroscopic functionality. Correlating the interplay is challenging, however, intelligent hyperspectral scanning tunneling sp…
Latent Instabilities in Metallic LaNiO3 Films by Strain Control of Fermi-Surface Topology
Hyang Keun Yoo, Seung Ill Hyun, Luca Moreschini +10
Strain control is one of the most promising avenues to search for new emergent phenomena in transition-metal-oxide films. Here, we investigate the strain-induced changes of electro…
Electronic structure and charge-density wave transition in monolayer VS_{2}
Hyuk Jin Kim, Byoung Ki Choi, In Hak Lee +6
Vanadium disulfide (VS_{2}) attracts elevated interests for its charge-density wave (CDW) phase transition, ferromagnetism, and catalytic reactivity, but the electronic structure o…
Tunable Electronic Structure in Gallium Chalcogenide van der Waals Compounds
Brian Shevitski, Søren Ulstrup, Roland J. Koch +8
Transition metal monochalcogenides comprise a class of two-dimensional materials with electronic band gaps that are highly sensitive to material thickness and chemical composition.…
Observation of the topological Dirac fermions and surface states in superconducting BaSn3
K. Huang, A. Y. Luo, C. Chen +15
The interplay between topological electronic structure and superconductivity has attracted tremendous research interests recently as they could induce topological superconductivity…
Observation of topological electronic structure in quasi-1D superconductor TaSe3
Cheng Chen, Aiji Liang, Shuai Liu +21
Topological superconductors (TSCs), with the capability to host Majorana bound states that can lead to non-Abelian statistics and application in quantum computation, have been one…
Discovery of interlayer plasmon polaron in graphene/WS heterostructures
Søren Ulstrup, Yann in 't Veld, Jill A. Miwa +11
Harnessing electronic excitations involving coherent coupling to bosonic modes is essential for the design and control of emergent phenomena in quantum materials [1]. In situations…
Bilayer splitting and c-axis coupling in bilayer manganites showing colossal magnetoresistance
C. Jozwiak, J. Graf, S. Y. Zhou +5
By performing angle-resolved photoemission spectroscopy of the bilayer colossal magnetoresistive (CMR) manganite, , we provide the complete mapping o…
Revealing the EuCd_{2}As_{2} Semiconducting Band Gap via n-type La-Doping
Ryan A. Nelson, Jesaiah King, Shuyu Cheng +16
EuCd_{2}As_{2} has attracted considerable interest as one of the few magnetic Weyl semimetal candidate materials, although recently there have been emerging reports that claim it t…
A substitutional quantum defect in WS discovered by high-throughput computational screening and fabricated by site-selective STM manipulation
John C. Thomas, Wei Chen, Yihuang Xiong +21
Point defects in two-dimensional materials are of key interest for quantum information science. However, the space of possible defects is immense, making the identification of high…
Charge order landscape and competition with superconductivity in kagome metals
Mingu Kang, Shiang Fang, Jonggyu Yoo +13
In kagome metals AV3Sb5 (A = K, Rb, Cs), three-dimensional charge order (3D-CO) is the primary instability that sets the stage for other collective orders to emerge, including unid…
Visualizing Atomic-Scale Negative Differential Resistance in Bilayer Graphene
Keun Su Kim, Tae-Hwan Kim, Andrew L. Walter +4
We investigate the atomic-scale tunneling characteristics of bilayer graphene on silicon carbide using the scanning tunneling microscopy. The high-resolution tunneling spectroscopy…
Direct visualization of gate-tunable flat bands in twisted double bilayer graphene
Souvik Sasmal, Ryan Muzzio, Ahmed Khalifa +12
The symmetry-broken correlated states in twisted double bilayer graphene (TDBG) can be tuned via several external knobs, including twist angle, displacement field, and carrier dens…
Small scale rotational disorder observed in epitaxial graphene on SiC(0001)
Andrew L. Walter, Aaron Bostwick, Florian Speck +8
Interest in the use of graphene in electronic devices has motivated an explosion in the study of this remarkable material. The simple, linear Dirac cone band structure offers a uni…
Small Fermi pockets intertwined with charge stripes and pair density wave order in a kagome superconductor
Hong Li, Dongjin Oh, Mingu Kang +13
The kagome superconductor family AV3Sb5 (A=Cs, K, Rb) emerged as an exciting platform to study exotic Fermi surface instabilities. Here we use spectroscopic-imaging scanning tunnel…
Interfacial Electron-Phonon Coupling Constants Extracted from Intrinsic Replica Bands in Monolayer FeSe/SrTiO
Brendan D. Faeth, Saien Xie, Shuolong Yang +10
The observation of replica bands by angle-resolved photoemission spectroscopy has ignited interest in the study of electron-phonon coupling at low carrier densities, particularly i…
Quasiparticle Transformation During a Metal-Insulator Transition in Graphene
Aaron Bostwick, Jessica L. McChesney, Konstantin Emtsev +4
Here we show, with simultaneous transport and photoemission measurements, that the graphene terminated SiC(0001) surface undergoes a metal-insulator transition (MIT) upon dosingwit…
Orbital Fingerprint of Topological Fermi Arcs in a Weyl Semimetal
Chul-Hee Min, Hendrik Bentmann, Jennifer N. Neu +15
The monopnictides TaAs and TaP are well-established Weyl semimetals. Yet, a precise assignment of Fermi arcs, accomodating the predicted chiral charge of the bulk Weyl points, has…
Investigating the Electrical Transport Properties and Electronic Structure of Zr2CuSb3
Eoghan Downey, Soumya S. Bhat, Shane Smolenski +7
The checkerboard lattice has been proposed to host topological flat bands as a result of destructive interference among its various electronic hopping terms. However, it has proven…
Spectromicroscopic measurement of surface and bulk band structure interplay in a disordered topological insulator
Erica Kotta, Lin Miao, Yishuai Xu +9
Topological insulators are bulk semiconductors that manifest in-gap massless Dirac surface states due to the topological bulk-boundary correspondence principle [1-3]. These surface…
Symmetry Breaking in Few Layer Graphene Films
Aaron Bostwick, Taisuke Ohta, Jessica L. McChesney +4
Recently, it was demonstrated that the quasiparticle dynamics, the layer-dependent charge and potential, and the c-axis screening coefficient could be extracted from measurements o…
Role of electron-phonon coupling in excitonic insulator candidate Ta2NiSe5
Cheng Chen, Xiang Chen, Weichen Tang +15
Electron-hole bound pairs, or excitons, are common excitations in semiconductors. They can spontaneously form and ``condense'' into a new insulating ground state -- the so-called e…
Comparative Electronic Structures of the Chiral Helimagnets Cr1/3NbS2 and Cr1/3TaS2
Lilia S. Xie, Oscar Gonzalez, Kejun Li +16
Magnetic materials with noncollinear spin textures are promising for spintronic applications. To realize practical devices, control over the length and energy scales of such spin t…
Nanoscale view of engineered massive Dirac quasiparticles in lithographic superstructures
Alfred J. H. Jones, Lene Gammelgaard, Mikkel O. Sauer +13
Massive Dirac fermions are low-energy electronic excitations characterized by a hyperbolic band dispersion. They play a central role in several emerging physical phenomena such as…
Topological flat bands in frustrated kagome lattice CoSn
Mingu Kang, Shiang Fang, Linda Ye +8
Electronic flat bands in momentum space, arising from strong localization of electrons in real space, are an ideal stage to realize strong correlation phenomena. In certain lattice…
Fermi Surface and Electron Correlation Effects of Ferromagnetic Iron
J. Schaefer, M. Hoinkis, Eli Rotenberg +2
The electronic band structure of bulk ferromagnetic iron is explored by angle-resolved photoemission for electron correlation effects. Fermi surface cross-sections as well as band…
Nature of the current-induced insulator-to-metal transition in CaRuO as revealed by transport-ARPES
Cissy T Suen, Igor MarkoviÄ, Marta Zonno +21
The Mott insulator CaRuO exhibits a rare insulator-to-metal transition (IMT) induced by DC current. While structural changes associated with this transition have been track…
Twofold van Hove singularity and origin of charge order in topological kagome superconductor CsV3Sb5
Mingu Kang, Shiang Fang, Jeong-Kyu Kim +14
The layered vanadium antimonides AV3Sb5 (A = K, Rb, Cs) are a recently discovered family of topological kagome metals with a rich phenomenology of strongly correlated electronic ph…
Confinement Heteroepitaxy: Realizing Atomically Thin, Half-van der Waals Materials
Natalie Briggs, Brian Bersch, Yuanxi Wang +16
Three-dimensional epitaxial heterostructures are based on covalently-bonded interfaces, whereas those from 2-dimensional (2D) materials exhibit van der Waals interactions. Under th…
Influence of Bi Alloying on GaAs Valence Band Structure
Joshua J. P. Cooper, Jared W. Mitchell, Shane Smolenski +9
Bi alloying is predicted to transform GaAs from a semiconductor to a topological insulator or semi-metal. To date, studies of the GaAsBi alloy band structure have been…
Hot carrier-assisted switching of the electron-phonon interaction in 1-VSe
Paulina Majchrzak, Sahar Pakdel, Deepnarayan Biswas +20
We apply an intense infrared laser pulse in order to perturb the electronic and vibrational states in the three-dimensional charge density wave material 1-VSe. Ultrafast sna…
magnetoARPES: Angle Resolved Photoemission Spectroscopy with Magnetic Field Control
Sae Hee Ryu, Garett Reichenbach, Chris M. Jozwiak +4
Angle-Resolved Photoemission Spectroscopy (ARPES) is a premier technique for understanding the electronic excitations in conductive, crystalline matter, in which the induced photoc…
Strongly correlated itinerant magnetism on the boundary of superconductivity in a magnetic transition metal dichalcogenide
Nikola Maksimovic, Ryan Day, Na-Hyun Jo +8
Metallic ferromagnets with strongly interacting electrons often exhibit remarkable electronic phases such as ferromagnetic superconductivity, complex spin textures, and nontrivial…
Mapping the three-dimensional fermiology of the triangular lattice magnet EuAgSb
J. Green, Harry W. T. Morgan, Morgaine Mandigo-Stoba +9
In this paper, we report the temperature-field phase diagram as well as present a comprehensive study of the electronic structure and three-dimensional fermiology of the triangular…
Measurements of the quantum geometric tensor in solids
Mingu Kang, Sunje Kim, Yuting Qian +15
Understanding the geometric properties of quantum states and their implications in fundamental physical phenomena is at the core of modern physics. The Quantum Geometric Tensor (QG…
Effective screening and the plasmaron bands in Graphene
Andrew L. Walter, Aaron Bostwick, Ki-Joon Jeon +10
Electron-plasmon coupling in graphene has recently been shown to give rise to a "plasmaron" quasiparticle excitation. The strength of this coupling has been predicted to depend on…
Designer three-dimensional electronic bands in asymmetric transition metal dichalcogenide heterostructures
Oliver J. Clark, Anugrah Azhar, Ben A. Chambers +15
Van der Waals materials enable the construction of atomically sharp interfaces between compounds with distinct crystal and electronic properties. This is dramatically exploited in…
Mesoscale variations of chemical and electronic landscape on the surface of Weyl semimetal CoSnS visualized by ARPES and XPS
Sudheer Anand Sreedhar, Matthew Staab, Mingkun Chen +14
The multiple crystalline terminations in magnetic Weyl semimetal CoSnS display distinct topological and trivial surface states, which have successfully been distinguish…
Spin Excitations and Flat Electronic Bands in a Cr-based Kagome Superconductor
Zehao Wang, Yucheng Guo, Hsiao Yu Huang +33
In the quest for topology- and correlation-driven quantum states, kagome lattice materials have garnered significant interest for their band structures, featuring flat bands (FBs)…
Dimensional crossover of the electronic structure in LaNiO3 ultrathin films: Orbital reconstruction, Fermi surface nesting, and the origin of the metal-insulator transition
Hyang Keun Yoo, Seung Ill Hyun, Luca Moreschini +9
Dimensionality control in the LaNiO3 (LNO) heterostructure has attracted attention due to its two-dimensional (2D) electronic structure was predicted to have an orbital ordered ins…
In-plane orientation effects on the electronic structure, stability and Raman scattering of monolayer graphene on Ir(111)
Elena Starodub, Aaron Bostwick, Luca Moreschini +4
We employ angle-resolved photoemission spectroscopy (ARPES) to investigate the electronic structures of two rotational variants of epitaxial, single-layer graphene on Ir(111). As g…
Magnetization-direction-tunable kagome Weyl line
Zi-Jia Cheng, Ilya Belopolski, Tyler A. Cochran +21
Kagome magnets provide a fascinating platform for a plethora of topological quantum phenomena. Here, utilizing angle-resolved photoemission spectroscopy, we demonstrate Weyl lines…
Electronic rotons and Wigner crystallites in a two-dimensional dipole liquid
Soobin Park, Minjae Huh, Chris Jozwiak +3
A key concept proposed by Landau to explain superfluid liquid helium is the elementary excitation of quantum particles called rotons. The irregular arrangement of atoms in a liquid…
Graphene-driven correlated electronic states in one dimensional defects within WS
Antonio Rossi, John C. Thomas, Johannes T. Küchle +19
Tomonaga-Luttinger liquid (TLL) behavior in one-dimensional systems has been predicted and shown to occur at semiconductor-to-metal transitions within two-dimensional materials. Re…