Observation of Floquet-Bloch States on the Surface of a Topological Insulator

@article{Wang2013ObservationOF,
  title={Observation of Floquet-Bloch States on the Surface of a Topological Insulator},
  author={Y. Wang and Hadar Steinberg and Pablo Jarillo-Herrero and Nuh Gedik},
  journal={Science},
  year={2013},
  volume={342},
  pages={453 - 457}
}
Topological Replicas When a periodic perturbation couples strongly to electrons in a solid, replicas of the original electronic levels are predicted to develop at certain energies—the so-called Floquet-Bloch states. Such conditions can be achieved by shining light on a solid, but the effect is challenging to observe. Wang et al. (p. 453) used time- and angle-resolved photoemission spectroscopy to photoexcite Bi2Se3 and observe its dispersion at various delay times. The replicas were seen at… 

Selective scattering between Floquet–Bloch and Volkov states in a topological insulator

Time- and angle-resolved photoelectron spectroscopy experiments are used to monitor the transition between Floquet–Bloch and Volkov states in the topological insulator Bi2Se3. The coherent optical

Floquet states and optical conductivity of an irradiated two-dimensional topological insulator

We study the topology of the Floquet states and time-averaged optical conductivity of the lattice model of a thin topological insulator subject to a circularly polarized light using the extended Kubo

Edge states of Floquet–Dirac semimetal in a laser-driven semiconductor quantum-well

Band crossings observed in a wide range of condensed matter systems are recognized as a key to understand low-energy fermionic excitations that behave as massless Dirac particles. Despite rapid

Observation of a giant mass enhancement in the ultrafast electron dynamics of a topological semimetal

Topological phases of matter offer exciting possibilities to realize lossless charge and spin information transport on ultrafast time scales. However, this requires detailed knowledge of their

Ultrafast electron dynamics at the Dirac node of the topological insulator Sb2Te3

This work explores the surface Dirac fermion dynamics in the TI Sb2Te3 by time- and angle-resolved photoemission spectroscopy (TrARPES) and finds an in-gap DP located completely above the Fermi energy (EF).

Electronic transport in one-dimensional Floquet topological insulators via topological and nontopological edge states

Based on probing electronic transport properties we propose an experimental test for the recently discovered rich topological phase diagram of one-dimensional Floquet topological insulators with

Laser-induced persistent photovoltage on the surface of a ternary topological insulator at room temperature

Using time- and angle-resolved photoemission, we investigate the ultrafast response of excited electrons in the ternary topological insulator (Bi1-xSbx)2Te3 to fs-infrared pulses. We demonstrate that

Subpicosecond spin dynamics of excited states in the topological insulator Bi2Te3

Using time-, spin-, and angle-resolved photoemission, we investigate the ultrafast spin dynamics of hot electrons on the surface of the topological insulator Bi2Te3 following optical excitation by

Floquet topological insulators: from band structure engineering to novel non-equilibrium quantum phenomena.

We review methods for using time-periodic fields (e.g., laser or microwave fields) to induce non-equilibrium topological phenomena in quantum many-body systems. We discuss how such fields can be used
...

References

SHOWING 1-10 OF 40 REFERENCES

Ultrafast surface carrier dynamics in the topological insulator Bi₂Te₃.

It is found that the thermalization of the surface states is initially determined by interband scattering from the bulk conduction band, lasting for about 0.5 ps; this establishes a correlation between the nanoscale thickness of the bulk charge reservoir and the evolution of the ultrafast carrier dynamics in the surface Dirac cone.

Photonic Floquet topological insulators

This work proposes and experimentally demonstrate a photonic topological insulator free of external fields and with scatter-free edge transport—a photonic lattice exhibiting topologically protected transport of visible light on the lattice edges.

Massive Dirac Fermion on the Surface of a Magnetically Doped Topological Insulator

This work introduced magnetic dopants into the three-dimensional topological insulator dibismuth triselenide to break the time reversal symmetry and further position the Fermi energy inside the gaps by simultaneous magnetic and charge doping, thus achieving an insulating gapped Dirac state.

Floquet topological insulator in semiconductor quantum wells

Topological phases of matter have captured our imagination over the past few years, with tantalizing properties such as robust edge modes and exotic non-Abelian excitations, and potential

Driven electronic states at the surface of a topological insulator

(Received 29 May 2013; revised manuscript received 11 August 2013; published 23 October 2013) Motivated by recent photoemission experiments on the surface of topological insulators we compute the

Photoinduced transition between conventional and topological insulators in two-dimensional electronic systems.

It is shown how the electron system can be tuned through phases associated with different Chern numbers as the laser intensity is adiabatically swept, i.e., a photoinduced analog of the quantum Hall plateau transition.

Measurement of intrinsic dirac fermion cooling on the surface of the topological insulator Bi2Se3 using time-resolved and angle-resolved photoemission spectroscopy.

Analysis of the evolution of surface states and bulk band spectra in a prototypical topological insulator reveals strong phonon-assisted surface-bulk coupling at high lattice temperature and total suppression of inelastic scattering between the surface and the bulk at low latticeTemperature.

Optical response of graphene under intense terahertz fields

Optical responses of graphene in the presence of intense circularly and linearly polarized terahertz fields are investigated based on the Floquet theory. We examine the energy spectrum and density of

Floquet-Bloch theory of high-harmonic generation in periodic structures

Generation of high harmonics by the interaction of intense laser fields with periodic crystal structures is investigated theoretically. A nonperturbative Floquet-Bloch theory of the interacting

Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator

The observation of the quantum anomalous Hall (QAH) effect in thin films of chromium-doped (Bi,Sb)2Te3, a magnetic topological insulator shows a plateau in the Hall resistance as a function of the gating voltage without any applied magnetic fields, signifying the achievement of the QAH state.