Surface state charge dynamics of a high-mobility three-dimensional topological insulator.
نویسندگان
چکیده
We present a magneto-optical study of the three-dimensional topological insulator, strained HgTe, using a technique which capitalizes on advantages of time-domain spectroscopy to amplify the signal from the surface states. This measurement delivers valuable and precise information regarding the surface-state dispersion within <1 meV of the Fermi level. The technique is highly suitable for the pursuit of the topological magnetoelectric effect and axion electrodynamics.
منابع مشابه
Estimation of Accumulated Charge on . Complex Insulator Surface by using Axisymmetric Three Dimensional FM with Fixed Sand - Bed . by Ryu - ichiro OHYAMA
The surface of insulators accumulates charge during subject to high voltage stresses electrically.The surface charging causes deteriorations of electrical performance and durability of high voltage insulators in gas. In this paper, we describe a result of visual analysis of electric fields with accumulation charge on complex insulator surface to clear the effect of surface charging on the diele...
متن کاملUltrafast photocurrents at the surface of the three-dimensional topological insulator Bi2Se3
Three-dimensional topological insulators are fascinating materials with insulating bulk yet metallic surfaces that host highly mobile charge carriers with locked spin and momentum. Remarkably, surface currents with tunable direction and magnitude can be launched with tailored light beams. To better understand the underlying mechanisms, the current dynamics need to be resolved on the timescale o...
متن کاملModel Realization and Numerical Studies of a Three-Dimensional Bosonic Topological Insulator and Symmetry-Enriched Topological Phases
We study a topological phase of interacting bosons in (3þ 1) dimensions that is protected by charge conservation and time-reversal symmetry. We present an explicit lattice model that realizes this phase and that can be studied in sign-free Monte Carlo simulations. The idea behind our model is to bind bosons to topological defects called hedgehogs. We determine the phase diagram of the model and...
متن کاملOptically detecting the edge-state of a three-dimensional topological insulator under ambient conditions by ultrafast infrared photoluminescence spectroscopy
Ultrafast infrared photoluminescence spectroscopy was applied to a three-dimensional topological insulator TlBiSe2 under ambient conditions. The dynamics of the luminescence exhibited bulk-insulating and gapless characteristics bounded by the bulk band gap energy. The existence of the topologically protected surface state and the picosecond-order relaxation time of the surface carriers, which w...
متن کاملAmbipolar surface state thermoelectric power of topological insulator Bi2Se3.
We measure gate-tuned thermoelectric power of mechanically exfoliated Bi2Se3 thin films in the topological insulator regime. The sign of the thermoelectric power changes across the charge neutrality point as the majority carrier type switches from electron to hole, consistent with the ambipolar electric field effect observed in conductivity and Hall effect measurements. Near the charge neutrali...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Physical review letters
دوره 107 13 شماره
صفحات -
تاریخ انتشار 2011