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Dimensional crossover and symmetry transformation of the charge density waves in VSe2
P. Chen, Y. -H. Chan, R. -Y. Liu +5
Collective phenomena in solids can be sensitive to the dimensionality of the system; a case of special interest is VSe2, which shows a (r7 x r3) charge density wave (CDW) in the si…
Experimental evidence of plasmarons and effective fine structure constant in electron-doped graphene/h-BN heterostructure
Hongyun Zhang, Shuopei Wang, Eryin Wang +13
Electron-electron interaction is fundamental in condensed matter physics and can lead to composite quasiparticles called plasmarons, which strongly renormalize the dispersion and c…
Quantum-spin-Hall insulator with a large gap: single-layer 1T' WSe
P. Chen, W. -W. Pai, Y. -H. Chan +6
Two-dimensional (2D) topological insulators (TIs) are promising platforms for low-dissipation spintronic devices based on the quantum spin Hall (QSH) effect, but experimental reali…
Emergence of charge density waves and a pseudogap in single-layer TiTe2
P. Chen, Woei Wu Pai, Y. -H. Chan +8
Two-dimensional materials constitute a promising platform for developing nanoscale devices and systems. Their physical properties can be very different from those of the correspond…
Experimental observation of topological Fermi arcs in type-II Weyl semimetal MoTe2
Ke Deng, Guoliang Wan, Peng Deng +17
Weyl semimetal is a new quantum state of matter [1-12] hosting the condensed matter physics counterpart of relativisticWeyl fermion [13] originally introduced in high energy physic…
Charge-Carrier Screening in Single-Layer Graphene
David A. Siegel, William Regan, Alexei V. Fedorov +2
The effect of charge-carrier screening on the transport properties of a neutral graphene sheet is studied by directly probing its electronic structure. We find that the Fermi veloc…
Angle Dependent Van Hove Singularities in Slightly Twisted Graphene Bilayer
Wei Yan, Mengxi Liu, Rui-Fen Dou +7
Recent studies show that two low-energy Van Hove singularities (VHSs) seen as two pronounced peaks in the density of states (DOS) could be induced in twisted graphene bilayer. Here…
Topological Surface States and Dirac point tuning in ternary Bi2Te2Se class of topological insulators
M. Neupane, S. -Y. Xu, L. A. Wray +14
Using angle-resolved photoemission spectroscopy, we report electronic structure for representative members of ternary topological insulators. We show that several members of this f…
Electron dynamics in topological insulator based semiconductor-metal interfaces (topological p-n interface based on Bi2Se3 class)
L. Andrew Wray, Suyang Xu, Madhab Neupane +10
Single-Dirac-cone topological insulators (TI) are the first experimentally discovered class of three dimensional topologically ordered electronic systems, and feature robust, massl…
A topological insulator surface under strong Coulomb, magnetic and disorder perturbations
L. Andrew Wray, Su-Yang Xu, Yuqi Xia +7
Three dimensional topological insulators embody a newly discovered state of matter characterized by conducting spin-momentum locked surface states that span the bulk band gap as de…
Realization of an isolated Dirac node and strongly modulated Spin Texture in the topological insulator Bi2Te3
Su-Yang Xu, L. A. Wray, Y. Xia +12
The development of spin-based applications of topological insulators requires the knowledge and understanding of spin texture configuration maps as they change via gating in the vi…
Observation of Topological Order in the TlBiSe2 class : Probing the "spin" and "phase" on topological insulator surfaces
Su-Yang Xu, L. A. Wray, Y. Xia +9
A topological insulator is characterized by spin-momentum locking on its boundary. The spin momentum locking on the surface of a three dimensional topological insulator leads to th…
Discovery of several large families of Topological Insulator classes with backscattering-suppressed spin-polarized single-Dirac-cone on the surface
Su-Yang Xu, L. A. Wray, Y. Xia +9
Three dimensional (3D) topological insulators are novel states of quantum matter that feature spin-momentum locked helical Dirac fermions on their surfaces and hold promise to open…
First observation of Spin-Momentum Helical Locking in Bi2Se3 and Bi2Te3, demonstration of Topological-Order at 300K and a realization of topological-transport-regime
D. Hsieh, Y. Xia, D. Qian +14
Both the theoretical and experimental discovery of single-Dirac-cone topological-insulator-class was reported at arXiv:0812.2078 (2008) [Y. Xia et.al., Nature Physics 5, 398-402 (2…
Time-reversal-protected single-Dirac-cone topological-insulator states in Bi2Te3 and Sb2Te3: Topologically Spin-polarized Dirac fermions with pi Berry's Phase
D. Hsieh, Y. Xia, D. Qian +12
We show that the strongly spin-orbit coupled materials Bi2Te3 and Sb2Te3 (first non-Bi topological insulator) and their derivatives belong to the Z2 (Time-Reversal-Protected, elast…
Topological Control: Systematic control of topological insulator Dirac fermion density on the surface of Bi2Te3
Y. Xia, D. Qian, D. Hsieh +8
Three dimensional (3D) topological insulators are quantum materials with a spin-orbit induced bulk insulating gap that exhibit quantum-Hall-like phenomena in the absence of applied…
First observation of spin-helical Dirac fermions and topological phases in undoped and doped Bi2Te3 demonstrated by spin-ARPES spectroscopy
D. Hsieh, Y. Xia, D. Qian +12
Electron systems that possess light-like dispersion relations or the conical Dirac spectrum, such as graphene and bismuth, have recently been shown to harbor unusual collective sta…