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Dimensional crossover in a layered ferromagnet detected by spin correlation driven distortions
A. Ron, E. Zoghlin, L. Balents +2
Magneto-elastic distortions are commonly detected across magnetic long-range ordering (LRO) transitions. In principle, they are also induced by the magnetic short-range ordering (S…
Experimental Discovery of Topological Surface States - A New Type of 2D Electron Systems (Review Article)
M. Zahid Hasan, Su-Yang Xu, David Hsieh +2
Topological Surface States (TSS) represent new types of two dimensional electron systems with novel and unprecedented properties distinct from any quantum Hall-like or spin-Hall ef…
Measurement of intrinsic Dirac fermion cooling on the surface of a topological insulator BiSe using time- and angle-resolved photoemission spectroscopy
Y. H. Wang, D. Hsieh, E. J. Sie +5
We perform time- and angle-resolved photoemission spectroscopy of a prototypical topological insulator BiSe to study the ultrafast dynamics of surface and bulk electrons af…
Control over topological insulator photocurrents with light polarization
J. W. McIver, D. Hsieh, H. Steinberg +2
Three-dimensional topological insulators represent a new quantum phase of matter with spin-polarized surface states that are protected from backscattering. The static electronic pr…
Selective probing of photo-induced charge and spin dynamics in the bulk and surface of a topological insulator
D. Hsieh, F. Mahmood, J. W. McIver +3
Topological insulators possess completely different spin-orbit coupled bulk and surface electronic spectra that are each predicted to exhibit exotic responses to light. Here we rep…
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 new experimental approach for the exploration of topological quantum phenomena : Topological Insulators and Superconductors
M. Zahid Hasan, David Hsieh, Yuqi Xia +3
The three-dimensional topological insulator (originally called "topological insulators") is the first example in nature of a topologically ordered electronic phase existing in thre…
Direct observation of spin-polarized surface states in the parent compound of topological insulator Bi-Sb using spin-resolved-ARPES in a 3D Mott-polarimetry spin mode
D. Hsieh, Y. Xia, L. Wray +9
We report high-resolution spin-resolved photoemission spectroscopy (Spin-ARPES) measurements on the parent compound Sb of the first discovered 3D topological insulator Bi{1-x}Sb{x}…
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…
Observation of a warped helical spin-texture in BiSe from circular dichroism angle-resolved photoemission spectroscopy
Y. H. Wang, D. Hsieh, D. Pilon +4
A differential coupling of topological surface states to left- versus right-circularly polarized light is the basis of many opto-spintronics applications of topological insulators.…
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…
Direct observation of spin-polarized surface states in the parent compound of a topological insulator using high-resolution spin-resolved-ARPES spectroscopy in a Mott-polarimetry mode
D. Hsieh, L. A. Wray, D. Qian +4
We report high-resolution spin-resolved photoemission spectroscopy (Spin-ARPES) measurements on the parent compound Sb of the recently discovered 3D topological insulator Bi1-xSbx…
A topological Dirac insulator in a quantum spin Hall phase (experimental realization of a 3D Topological Insulator)
D. Hsieh, D. Qian, L. Wray +4
When electrons are subject to a large external magnetic field, the conventional charge quantum Hall effect \cite{Klitzing,Tsui} dictates that an electronic excitation gap is genera…
Observation of topologically protected Dirac spin-textures and πBerry's phase in pure Antimony (Sb) and topological insulator BiSb
D. Hsieh, Y. Xia, L. Wray +10
A topologically ordered material is characterized by a rare quantum organization of electrons that evades the conventional spontaneously broken symmetry based classification of con…
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…
Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
Y. Xia, D. Qian, D. Hsieh +8
Recent theories and experiments have suggested that strong spin-orbit coupling effects in certain band insulators can give rise to a new phase of quantum matter, the so-called topo…
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…
A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
D. Hsieh, D. Qian, L. Wray +4
When electrons are subject to a large external magnetic field, the conventional charge quantum Hall effect \cite{Klitzing,Tsui} dictates that an electronic excitation gap is genera…
Electrons on the surface of Bi2Se3 form a topologically-ordered two dimensional gas with a non-trivial Berry's phase
Y. Xia, L. Wray, D. Qian +8
The interface between a superconductor and a topological insulator has been proposed to harbor novel quasiparticles that realize physical schemes for fault-tolerant quantum computa…