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Strongly Anisotropic Spin and Orbital Rashba Effect at a Tellurium - Noble Metal Interface
B. Geldiyev, M. Ünzelmann, P. Eck +19
We study the interplay of lattice, spin and orbital degrees of freedom in a two-dimensional model system: a flat square lattice of Te atoms on a Au(100) surface. The atomic structu…
Inversion Symmetry Breaking in Epitaxial Ultrathin Bi (111) Films
Hadass S. Inbar, Muhammad Zubair, Jason T. Dong +8
Bismuth (Bi) films hold potential for spintronic devices and topological one-dimensional edge transport. Large-area high-quality (111) Bi ultrathin films are grown on InSb (111)B s…
Tuning the Band Topology of GdSb by Epitaxial Strain
Hadass S. Inbar, Dai Q. Ho, Shouvik Chatterjee +12
Rare-earth monopnictide (RE-V) semimetal crystals subjected to hydrostatic pressure have shown interesting trends in magnetoresistance, magnetic ordering, and superconductivity, wi…
Epitaxial growth, magnetoresistance, and electronic band structure of GdSb magnetic semimetal films
Hadass S. Inbar, Dai Q. Ho, Shouvik Chatterjee +12
Motivated by observations of extreme magnetoresistance (XMR) in bulk crystals of rare-earth monopnictide (RE-V) compounds and emerging applications in novel spintronic and plasmoni…
Two-dimensional ferromagnetic extension of a topological insulator
P. Kagerer, C. I. Fornari, S. Buchberger +19
Inducing a magnetic gap at the Dirac point of the topological surface state (TSS) in a 3D topological insulator (TI) is a route to dissipationless charge and spin currents. Ideally…
The nature of ferromagnetism in the chiral helimagnet
N. Sirica, P. Vilmercati, F. Bondino +12
The chiral helimagnet, , hosts exotic spin textures, whose influence on the magneto-transport properties, make this material an ideal candidate for future spintron…
Concomitant enhancement of electron-phonon coupling and electron-electron interaction in graphene decorated with ytterbium
Minhee Kang, Jinwoong Hwang, Ji-Eun Lee +2
The interplay between electron-electron interaction and electron-phonon coupling has been one of the key issues in graphene as it can provide information on the origin of enhanced…
Controlling magnetoresistance by tuning semimetallicity through dimensional confinement and heteroepitaxy
Shouvik Chatterjee, Shoaib Khalid, Hadass S. Inbar +7
Controlling the electronic properties via bandstructure engineering is at the heart of modern semiconductor devices. Here, we extend this concept to semimetals where, utilizing LuS…
Weak antilocalization in quasi-two-dimensional electronic states of epitaxial LuSb thin films
Shouvik Chatterjee, Shoaib Khalid, Hadass S. Inbar +10
Observation of large non-saturating magnetoresistance in rare-earth monopnictides has raised enormous interest in understanding the role of its electronic structure. Here, by a com…
Observation of Dirac surface states in the hexagonal PtBi2, a possible origin of the linear magnetoresistance
S. Thirupathaiah, Y. Kushnirenko, E. Haubold +8
The nonmagnetic compounds showing extremely large magnetoresistance are attracting a great deal of research interests due to their potential applications in the field of spintronic…
Electronic structure of transferred graphene/h-BN van der Waals heterostructures with nonzero stacking angles by nano-ARPES
Eryin Wang, Guorui Chen, Guoliang Wan +8
In van der Waals heterostructures, the periodic potential from the Moiré superlattice can be used as a control knob to modulate the electronic structure of the constituent material…
Second generation Dirac cones and inversion symmetry breaking induced gaps in graphene/hexagonal boron nitride
Eryin Wang, Xiaobo Lu, Shijie Ding +12
Graphene/h-BN has emerged as a model van der Waals heterostructure, and the band structure engineering by the superlattice potential has led to various novel quantum phenomena incl…
Magnetic effects in sulfur-decorated graphene
Choongyu Hwang, Shane A. Cybart, S. J. Shin +13
The interaction between two different materials can present novel phenomena that are quite different from the physical properties observed when each material stands alone. Strong e…
Monolayer charge-neutral graphene on platinum with extremely weak electron-phonon coupling
Wei Yao, Eryin Wang, Ke Deng +13
Epitaxial growth of graphene on transition metal substrates is an important route for obtaining large scale graphene. However, the interaction between graphene and the substrate of…
Topological nature of FeSeTe superconductor
Zhijun Wang, P. Zhang, Gang Xu +10
We demonstrate, using first-principles calculations, that the electronic structure of FeSeTe (=0.5) is topologically non-trivial, characterized by an odd $\mathbb…
Electronic structure basis for the titanic magnetoresistance in WTe
I. Pletikosić, Mazhar N. Ali, A. Fedorov +2
The electronic structure basis of the extremely large magnetoresistance in layered non-magnetic tungsten ditelluride has been investigated by angle-resolved photoelectron spectrosc…
Hyperfine field assessment of the magnetic structure of ZrZn2
A. V. Tsvyashchenko, D. A. Salamatin, A. Velichkov +9
Time differential perturbed angular gamma-gamma-correlation (TDPAC) method on 111Cd nuclei probes inserted in ZrZn1.9 is used to measure the magnetic hyperfine fields (MHF) at Zr a…
Quasiparticle Dynamics in Reshaped Helical Dirac Cone of Topological Insulators
Lin Miao, Z. F. Wang, Wenmei Ming +14
Topological insulators (TIs) and graphene present two unique classes of materials which are characterized by spin polarized (helical) and non-polarized Dirac-cone band structures,…
Electron behavior in topological insulator based P-N overlayer interfaces
L. A. Wray, M. Neupane, S. -Y. Xu +8
Topological insulators (TIs) are novel materials that manifest spin-polarized Dirac states on their surfaces or at interfaces made with conventional matter. We have measured the el…
Widespread spin polarization effects in photoemission from topological insulators
Chris Jozwiak, Yulin Chen, Alexei V. Fedorov +11
High resolution spin- and angle-resolved photoemission spectroscopy (spin-ARPES) was performed on the three-dimensional topological insulator BiSe using a recently develope…
Direct measurement of quantum phases in graphene via photoemission spectroscopy
Choongyu Hwang, Cheol-Hwan Park, David A. Siegel +3
Quantum phases provide us with important information for understanding the fundamental properties of a system. However, the observation of quantum phases, such as Berry's phase and…
Electron-Phonon Coupling in Highly-Screened Graphene
David A. Siegel, Choongyu Hwang, Alexi V. Fedorov +1
Photoemission studies of graphene have resulted in a long-standing controversy concerning the strength of the experimental electron-phonon interaction in comparison with theoretica…
Many-body interactions in quasi-freestanding graphene
David A. Siegel, Cheol-Hwan Park, Choongyu Hwang +4
The Landau-Fermi liquid picture for quasiparticles assumes that charge carriers are dressed by many-body interactions, forming one of the fundamental theories of solids. Whether th…
Quasi-Freestanding Multilayer Graphene Films on the Carbon Face of SiC
David A. Siegel, Choongyu Hwang, Alexei V. Fedorov +1
The electronic band structure of as-grown and doped graphene grown on the carbon face of SiC is studied by high-resolution angle-resolved photoemission spectroscopy, where we obser…