# 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…

## Topics from this paper

## 604 Citations

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

- Physics
- 2016

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…

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

- MedicineScientific reports
- 2021

It is revealed that in a semiconductor quantum-well driven by a cw-laser with linear polarization, the optical Stark effect conducts bulk-band crossing, and the resulting Floquet-Dirac semimetallic phase supports an unconventional edge state in the projected one-dimensional Brillouin zone under a boundary condition that an electron is confined in the direction perpendicular to that of the laser polarization.

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

- Communications Physics
- 2021

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

- Physics, MedicineScientific reports
- 2015

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

- Physics
- 2020

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

- Chemistry, Physics
- 2017

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

- Physics
- 2017

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…

Ultrafast electron dynamics in the topological insulator Bi2Se3 studied by time-resolved photoemission spectroscopy

- Physics
- 2014

Abstract We characterize the topological insulator Bi2Se3 using time- and angle-resolved photoemission spectroscopy. By employing two-photon photoemission, a complete picture of the unoccupied…

Anomalous Photoelectric Effect of a Polycrystalline Topological Insulator Film

- Materials Science, MedicineScientific reports
- 2014

Under illumination with non-polarised light, transport measurements reveal that the resistance of the topological surface states suddenly increases when the polycrystalline film is illuminated, and the resistance variation is positively dependent on the light intensity but has no relation to the applied electric field.

Fundamentally fastest optical processes at the surface of a topological insulator

- PhysicsPhysical Review B
- 2018

We predict that a single oscillation of a strong optical pulse can significantly populate the surface conduction band of a three-dimensional topological insulator, Bi2Se3. Both linearly- and…

## References

SHOWING 1-10 OF 42 REFERENCES

Ultrafast surface carrier dynamics in the topological insulator Bi₂Te₃.

- Materials Science, PhysicsNano letters
- 2012

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

- Physics, MedicineNature
- 2013

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

- Physics, MedicineScience
- 2010

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

- Physics
- 2011

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

- Physics
- 2013

(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.

- Physics, MedicinePhysical review letters
- 2010

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.

- Physics, MedicinePhysical review letters
- 2012

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

- Physics
- 2011

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

- Physics
- 1997

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

- Chemistry, PhysicsScience
- 2013

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.