Publications (71)
Bulk Fermi surface of the type-II Weyl semimetal candidate NbIrTe
Rico Schönemann, Yu-Che Chiu, Wenkai Zheng +5
Recently, a new group of layered transition-metal tetra-chalcogenides were proposed, via first principles calculations, to correspond to a new family of Weyl type-II semimetals wit…
Giant Tunability of Intersubband Transitions and Quantum Hall Quartets in Few-Layer InSe Quantum Wells
Dmitry Shcherbakov, Greyson Voigt, Shahriar Memaran +8
A two-dimensional (2D) quantum electron system is characterized by the quantized energy levels, or subbands, in the out-of-plane direction. Populating higher subbands and controlli…
High-temperature superconductivity on the verge of a structural instability in lanthanum superhydride
Dan Sun, Vasily S. Minkov, Shirin Mozaffari +5
A possibility of high, room-temperature superconductivity was predicted for metallic hydrogen in the 1960s. However, metallization and superconductivity of hydrogen are yet to be u…
Charge density wave in a band insulator
Md Shafayat Hossain, Wenhao Liu, Yuqi Zhang +20
Charge density wave (CDW) implies a periodic modulation of the charge density. Typically observed in metallic systems, CDWs arise from Fermi surface instabilities, resulting in the…
Room-temperature quantum spin Hall edge state in a higher-order topological insulator BiBr
Nana Shumiya, Md Shafayat Hossain, Jia-Xin Yin +24
Room-temperature realization of macroscopic quantum phenomena is one of the major pursuits in fundamental physics. The quantum spin Hall state, a topological quantum phenomenon tha…
Magnetic anisotropy of the alkali iridate NaIrO at high magnetic fields: evidence for strong ferromagnetic Kitaev correlations
Sitikantha. D Das, Sarbajaya Kundu, Zengwei Zhu +10
The magnetic field response of the Mott-insulating honeycomb iridate NaIrO is investigated using torque magnetometry measurements in magnetic fields up to 60 tesla. A p…
Signatures of Electron Fractionalization in Ultraquantum Bismuth
Kamran Behnia, Luis Balicas, Yakov Kopelevich
Because of the long Fermi wavelength of itinerant electrons, the quantum limit of elemental bismuth (unlike most metals) can be attained with a moderate magnetic field. The quantiz…
Enhanced Optoelectronic Response in Bilayer Lateral Heterostructures of Transition Metal Dichalcogenides
Prasana K. Sahoo, Shahriar Memaran, Yan Xin +8
Two-dimensional lateral heterojunctions are basic components for low-power and flexible optoelectronics. In contrast to monolayers, devices based on few-layer lateral heterostructu…
Disorder driven crossover between anomalous Hall regimes in FeGaTe
Sang-Eon Lee, Minkyu Park, W. Kice Brown +8
The large anomalous Hall conductivity (AHC) of the Fe(Ge,Ga)Te compounds has attracted considerable attention. Here, we expose the intrinsic nature of AHC in FeGaTe…
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…
Metal to insulator quantum-phase transition in few-layered ReS
Nihar R. Pradhan, Amber McCreary, Daniel Rhodes +11
In ReS a layer-independent direct band-gap of 1.5 eV implies a potential for its use in optoelectronic applications. ReS crystallizes in the 1T-structure which l…
High Field de Haas - van Alphen Studies of the Fermi Surfaces of LaMIn (M = Co, Rh, Ir)
Donavan Hall, Luis Balicas, Z. Fisk +3
We report measurements of the de Haas - van Alphen effect on a series of compounds, LaMIn (M = Co, Rh, Ir). The results show that each of the Co and Ir Fermi surfaces (FSs) e…
Bulk Fermi surfaces of the Dirac type-II semimetallic candidate NiTe2
Wenkai Zheng, Rico Schönemann, Shirin Mozaffari +7
Here, we present a study on the Fermi-surface of the Dirac type-II semi-metallic candidate NiTe via the temperature and angular dependence of the de Haas-van Alphen (dHvA) effe…
Magnetism and Spin Dynamics in Room-Temperature van der Waals Magnet FeGeTe
Laith Alahmed, Bhuwan Nepal, Juan Macy +12
Two-dimensional (2D) van der Waals (vdWs) materials have gathered a lot of attention recently. However, the majority of these materials have Curie temperatures that are well below…
Topological properties of possible Weyl superconducting states of URuSi
Pallab Goswami, Luis Balicas
We show that the current thermodynamic measurements in the superconducting phase of are compatible with two distinct singlet chiral paired st…
High magnetic field response of superconductivity dome in quantum artificial High Tc superlattices with variable geometry
Gaetano Campi, Andrea Alimenti, Sang-Eon Lee +5
It is known that cuprate artificial high Tc superlattices (AHTS) with period d, composed of quantum wells confining interface space charge in stoichiometric Mott insulator layers (…
Field induced density wave in a kagome superconductor
Md Shafayat Hossain, Qi Zhang, Julian Ingham +19
On the kagome lattice, electrons benefit from the simultaneous presence of band topology, flat electronic bands, and van Hove singularities, forming competing or cooperating orders…
Anisotropic positive linear and sub-linear magnetoresistivity in the cubic type-II Dirac metal PdIn
Aikaterini Flessa Savvidou, Andrzej Ptok, G. Sharma +6
We report a transport study on PdIn which displays multiple Dirac type-II nodes in its electronic dispersion. PdIn is characterized by low residual resistivities an…
Diverse Magnetic Phase Diagram and Anomalous Hall Effect in Antiferromagetic LuMnSn
Shirin Mozaffari, Seung-Hwan Do, Richa P. Madhogaria +7
The interactions between conduction electrons and magnetism can significantly enhance the Hall signal, a phenomenon known as the anomalous Hall effect (AHE). While the AHE is gener…
Transport response of topological hinge modes in -BiBr
Md Shafayat Hossain, Qi Zhang, Zhiwei Wang +19
Electronic topological phases are renowned for their unique properties, where conducting surface states exist on the boundary of an insulating three-dimensional bulk. While the tra…
Giant Anisotropic Magnetoresistance due to Purely Orbital Rearrangement in the Quadrupolar Heavy Fermion Superconductor PrVAl
Yasuyuki Shimura, Qiu Zhang, Bin Zeng +11
We report the discovery of giant and anisotropic magnetoresistance due to the orbital rearrangement in a non-magnetic correlated metal. In particular, we measured the magnetoresist…
Photoconductivity of few-layered p-WSe2 phototransistors via multi-terminal measurements
Nihar R. Pradhan, Carlos Garcia, Joshua Holleman +6
Recently, two-dimensional materials and in particular transition metal dichalcogenides (TMDs) were extensively studied because of their strong light-matter interaction and the rema…
Terahertz field-induced giant symmetry modulations in a van der Waals antiferromagnet
Sheikh Rubaiat Ul Haque, Martin J. Cross, Sangeeta Rajpurohit +19
Strong-field terahertz (THz) excitations enable dynamic control over electronic, lattice and symmetry degrees of freedom in quantum materials. Here, we uncover pronounced terahertz…
Non-stoichiometry and Defects in the Weyl Semimetals TaAs, TaP, NbP, and NbAs
Tiglet Besara, Daniel Rhodes, Kuan-Wen Chen +6
We report a structural study of the Weyl semimetals TaAs, TaP, NbP, and NbAs, utilizing diffraction techniques (single crystal x-ray diffraction and energy dispersive spectroscopy)…
Broken symmetries associated with a Kagome chiral charge order
Zi-Jia Cheng, Md Shafayat Hossain, Qi Zhang +17
Chirality or handedness manifests in all fields of science, ranging from cell biology, molecular interaction, and catalysis to different branches of physics. In condensed matter ph…
Kramers nodal lines in intercalated TaS superconductors
Yichen Zhang, Yuxiang Gao, Aki Pulkkinen +24
Kramers degeneracy is one fundamental embodiment of the quantum mechanical nature of particles with half-integer spin under time reversal symmetry. Under the chiral and noncentrosy…
Discovery of a topological exciton insulator with tunable momentum order
Md Shafayat Hossain, Tyler A. Cochran, Yu-Xiao Jiang +27
Correlated topological materials often maintain a delicate balance among physical symmetries: many topological orders are symmetry protected, while most correlated phenomena arise…
Anomalously high supercurrent density in a two-dimensional topological material
Qi Zhang, Md Shafayat Hossain, Brian Casas +24
Ongoing advances in superconductors continue to revolutionize technology thanks to the increasingly versatile and robust availability of lossless supercurrent. In particular high s…
Sequential Edge-Epitaxy in 2D Lateral Heterostructures
Prasana K. Sahoo, Shahriar Memaran, Yan Xin +2
Two-dimensional (2D) heterojunctions display a remarkable potential for application in high performance, low power electro-optical systems. p-n junctions based on vertically stacke…
Surface electronic structure of the topological Kondo insulator candidate correlated electron system SmB6
Madhab Neupane, Nasser Alidoust, SuYang Xu +15
The Kondo insulator SmB6 has long been known to exhibit low temperature transport anomalies whose origin is of great interest. Here we uniquely access the surface electronic struct…
Optoelectronic switch based on intrinsic dual Schottky diodes in ambipolar MoSe field-effect transistors
Nihar R. Pradhan, Zhengguang Lu, Daniel Rhodes +3
Here, we report the observation of a hitherto unreported optoelectronic effect, namely a light-induced diode-like response in multi-layered MoSe field-effect transistors whose…
Field induced density wave in the heavy fermion compound CeRhIn5
Philip J. W. Moll, Bin Zeng, Luis Balicas +4
Metals containing Ce often show strong electron correlations due to the proximity of the 4f state to the Fermi energy, leading to strong coupling with the conduction electrons. Thi…
Writing and detecting topological charges in exfoliated FeGeTe
Alex Moon, Yue Li, Conor McKeever +10
FeGeTe is a promising two-dimensional (2D) van der Waals (vdW) magnet for practical applications, given its magnetic properties. These include Curie temperatures above…
Anomalous metamagnetism in the low carrier density Kondo lattice YbRh3Si7
Binod K. Rai, S. Chikara, Xiaxin Ding +25
We report complex metamagnetic transitions in single crystals of the new low carrier Kondo antiferromagnet YbRh3Si7. Electrical transport, magnetization, and specific heat measurem…
High Photoresponsivity and Short Photo Response Times in Few-Layered WSe Transistors
Nihar R. Pradhan, Jonathan Ludwig, Zhengguang Lu +6
Here, we report the photoconducting response of field-effect transistors based on three atomic layers of chemical vapor transport grown WSe crystals mechanically exfoliated ont…
Type-II Weyl nodes, flat bands, and evidence for a topological Hall-effect in the new ferromagnet FeCrTe
Shyam Raj Karullithodi, Vadym Kulichenko, Mario A. Plata +5
The interplay between linearly dispersing or Dirac-like, and flat electronic bands, for instance, in the kagome ferromagnets, has attracted attention due to a possible interplay be…
Superconductivity and a van Hove singularity confined to the surface of a topological semimetal
Md Shafayat Hossain, Rajibul Islam, Zi-Jia Cheng +16
The interplay between electronic topology and superconductivity is the subject of great current interest in condensed matter physics. For example, superconductivity induced on the…
Superconducting dome due to the Fano-Feshbach shape resonance in artificial high-Tc superlattices
Gaetano Campi, Andrea Alimenti, Danielle Villa +7
In this work we provide compelling experimental validation of the Bianconi Perali Valletta (BPV) theory predicting a superconducting dome based on a quantum material design of Arti…
Critical current oscillations in the intrinsic hybrid vortex state of SmFeAs(O,F)
Philip J. W. Moll, Luis Balicas, Xiyu Zhu +4
In layered superconductors the order parameter may be modulated within the unit cell, leading to non-trivial modifications of the vortex core if the interlayer coherence length $ξ…
In-plane anisotropic magnetoresistance in detwinned ( = 0, 0.6)
Kelly J. Neubauer, Mason L. Klemm, Shirin Mozaffari +6
Understanding the magnetoresistance (MR) of a magnetic material forms the basis for uncovering the orbital mechanisms and charge-spin interactions in the system. Although the paren…
Pronounced photovoltaic response from multi-layered transition-metal dichalcogenides PN-junctions
Shahriar Memaran, Nihar R. Pradhan, Zhengguang Lu +7
Transition metal dichalcogenides (TMDs) are layered semiconductors with indirect band gaps comparable to Si. These compounds can be grown in large area, while their gap(s) can be t…
Tunable superconductivity coexisting with the anomalous Hall effect in 1T'-WS2
Md Shafayat Hossain, Qi Zhang, David Graf +25
Transition metal dichalcogenides are a family of quasi-two-dimensional materials that display a high technological potential due to their wide range of electronic ground states, e.…
Two-Fold Anisotropic Superconductivity in Bilayer T-MoTe
Zizhong Li, Apoorv Jindal, Alex Strasser +10
Noncentrosymmetric 2D superconductors with large spin-orbit coupling offer an opportunity to explore superconducting behaviors far beyond the Pauli limit. One such superconductor,…
Coexistence of Merons with Skyrmions in the Centrosymmetric van der Waals Ferromagnet Fe5GeTe2
Brian W. Casas, Yue Li, Alex Moon +8
FeGeTe is a centrosymmetric, layered van der Waals (vdW) ferromagnet that displays Curie temperatures (270-330 K) that are within the useful range for spintronic…
Magnetic field-induced non-trivial electronic topology in Fe3GeTe2
Juan Macy, Danilo Ratkovski, Purnima P. Balakrishnan +16
The anomalous Hall, Nernst and thermal Hall coefficients of FeGeTe display several features upon cooling, like a reversal in the Nernst signal below K pointing…
Complex Dirac-like Electronic Structure in Atomic Site Ordered Rh3In3.4Ge3.6
Aikaterini Flessa Savvidou, Judith K. Clark, Hua Wang +6
We report the synthesis via an indium flux method of a novel single-crystalline compound Rh3In3.4Ge3.6 that belongs to the cubic Ir3Ge7 structure type. In Rh3In3.4Ge3.6, the In and…
Nematic superconductivity from selective orbital pairing in Ba(Fe1-xMx)2As2 (M = Co, Ni) single crystals
Mason Klemm, Shirin Mozaffari, Rui Zhang +5
We use transport measurements to determine the in-plane anisotropy of the upper critical field Hc2 in detwinned superconducting Ba(Fe1-xMx)2As2 (M = Co, Ni) single crystals. In pre…
Giant Exfoliation Induced Magnetic Coercivity in FeGaTe
Lingrui Mei, PeiYu Cai, Sang-Eon Lee +6
Permanent magnets with strong anisotropy and high coercivity underpin modern information and energy technologies, yet rare-earth-free alternatives remain limited. Here, we show tha…
Evidence of a coupled electron-phonon liquid in NbGe
Hung-Yu Yang, Xiaohan Yao, Vincent Plisson +11
Whereas electron-phonon scattering typically relaxes the electron's momentum in metals, a perpetual exchange of momentum between phonons and electrons conserves total momentum and…
Anomalous insulator metal transition in boron nitride-graphene hybrid atomic layers
Li Song, Luis Balicas, Duncan J. Mowbray +8
The study of two-dimensional (2D) electronic systems is of great fundamental significance in physics. Atomic layers containing hybridized domains of graphene and hexagonal boron ni…
Discovery of a hybrid topological quantum state in an elemental solid
Md Shafayat Hossain, Frank Schindler, Rajibul Islam +17
Topology and interactions are foundational concepts in the modern understanding of quantum matter. Their nexus yields three significant research directions: competition between dis…
Field-Effect Transistors Based on Few-Layered alpha-MoTe_2
Nihar R. Pradhan, Daniel Rhodes, Simin Feng +6
Here we report the properties of field-effect transistors based on few layers of chemical vapor transport grown alpha- MoTe_2 crystals mechanically exfoliated onto SiO_2. We perfor…
Observation of nearly identical superconducting transition temperatures in pressurized Weyl semimetal MIrTe4 (M=Nb and Ta)
Sijin Long, Shu Cai, Rico Schonemann +13
Here we report the observation of pressure-induced superconductivity in type-II Weyl semimetal (WSM) candidate NbIrTe4 and the evolution of its Hall coefficient (RH), magnetoresist…
Superconducting Phase-Diagram of H3S under High Magnetic Fields
Shirin Mozaffari, Dan Sun, Vasily S. Minkov +7
We report the temperature dependence of the upper critical fields of the high temperature superconductor HS under applied pressures of 155 and 160 GPa through t…
Multiple Dirac Nodes and Symmetry Protected Dirac Nodal Line in Orthorhombic -RhSi
Shirin Mozaffari, Niraj Aryal, Rico Schönemann +6
Owing to their chiral cubic structure, exotic multifold topological excitations have been predicted and recently observed in transition metal silicides like -RhSi. Herein, we r…
Van der Waals Schottky barriers as interface probes of the correlation between chemical potential shifts and charge density wave formation in 1T-TiSe and 2H-NbSe
Ang J. Li, Xiaochen Zhu, Daniel Rhodes +3
Layered transition metal dichalcogenide (TMD) materials, i.e. 1T-TiSe and 2H-NbSe, harbor a second order charge density wave (CDW) transition where phonons play a key role…
Pomeranchuk instability of a topological crystal
Md Shafayat Hossain, Zahir Muhammad, Rajibul Islam +13
Nematic quantum fluids appear in strongly interacting systems and break the rotational symmetry of the crystallographic lattice. In metals, this is connected to a well-known instab…
Field-Induced Quadrupolar Quantum Criticality in PrV2Al20
Yasuyuki Shimura, Masaki Tsujimoto, Bin Zeng +3
PrV2Al20 is the heavy fermion superconductor based on the cubic Gamma3 doublet that exhibits non- magnetic quadrupolar ordering below ~ 0.6 K. Our magnetotransport study on PrV2Al2…
Enhanced Superconductivity in Monolayer -MoTe with Tilted Ising Spin Texture
Daniel Rhodes, Noah F. Yuan, Younghun Jung +13
Crystalline two-dimensional (2D) superconductors with low carrier density are an exciting new class of materials in which superconductivity coexists with strong interactions, the e…
High magnetic field induced crossover from the Kondo to Fermi liquid behavior in 1-VTe single crystals
Xiaxin Ding, Jie Xing, Gang Li +3
The magnetic and magnetotransport properties of metallic 1-VTe single crystals were investigated at temperatures from 1.3 to 300 K and in magnetic fields up to 35 T. Upon…
Local Inversion Symmetry Breaking and Thermodynamic Evidence for Ferrimagnetism in Fe3GaTe2
Sang-Eon Lee, Yue Li, Yeonkyu Lee +19
The layered compound Fe3GaTe2 is attracting attention due to its high Curie temperature, low dimensionality, and the presence of topological spin textures above room temperature, m…
Light sources with bias tunable spectrum based on van der Waals interface transistors
Hugo Henck, Diego Mauro, Daniil Domaretskiy +13
Light-emitting electronic devices are ubiquitous in key areas of current technology, such as data communications, solid-state lighting, displays, and optical interconnects. Control…
Spin excitations and the Fermi surface of superconducting FeS
Haoran Man, Jiangang Guo, Rui Zhang +17
High-temperature superconductivity occurs near antiferromagnetic instabilities and nematic state. Debate remains on the origin of nematic order in FeSe and its relation with superc…
Coexistence of Weyl Physics and Planar Defects in Semimetals TaP and TaAs
Tiglet Besara, Daniel A. Rhodes, Kuan-Wen Chen +10
We report a structural study of the Weyl semimetals TaAs and TaP, utilizing diffraction and imaging techniques, where we show that they contain a high density of defects, leading t…
Unconventional gapping behavior in a kagome superconductor
Md Shafayat Hossain, Qi Zhang, Eun Sang Choi +19
Determining the types of superconducting order in quantum materials is a challenge, especially when multiple degrees of freedom, such as bands or orbitals, contribute to the fermio…
Thickness and twist angle dependent interlayer excitons in metal monochalcogenide heterostructures
Wenkai Zheng, Li Xiang, Felipe de Quesada +18
Interlayer excitons, or bound electron-hole pairs whose constituent quasiparticles are located in distinct stacked semiconducting layers, are being intensively studied in heterobil…
Phase Modulators Based on High Mobility Ambipolar ReSe2 Field-Effect Transistors
Nihar R. Pradhan, Carlos Garcia, Bridget Isenberg +11
We fabricated ambipolar field-effect transistors (FETs) from multi-layered triclinic ReSe2, mechanically exfoliated onto a SiO2 layer grown on p-doped Si. In contrast to previous r…
Topological Hall Effect in Antiferromagnetic Co doped FeGaTe
Shyam Raj Karullithodi, Yeonkyu Lee, Vadym Kulichenko +8
FeGaTe is van der Waals (vdW) ferromagnet with a Curie temperature ranging from 350 K to 380 K, followed upon cooling by a ferrimagnetic transition near room temperat…
Gate-modulated conductance of few-layer WSe_2 field-effect transistors in the subgap regime: Schottky barrier transistor and subgap impurity states
Junjie Wang, Daniel Rhodes, Simin Feng +7
Two key subjects stand out in the pursuit of semiconductor research: material quality and contact technology. The fledging field of atomically thin transition metal dichalcogenides…
Direct-Write Printed Contacts to Layered and 2D Materials
Sharadh Jois, Erica Lee, Philip Li +10
Advancements in fabrication methods have shaped new computing device technologies. Among these methods, depositing electrical contacts to the channel material is fundamental to dev…
Hall plateaus at magic angles in bismuth beyond the quantum limit
Benoit Fauque, Huan Yang, Ilya Sheikin +3
We present a study of the angular dependence of the resistivity tensor up to 35 T in elemental bismuth complemented by torque magnetometry measurements in a similar configuration.…