Ultrafast photodoping and effective Fermi-Dirac distribution of the Dirac particles in Bi2Se3

Abstract

We exploit time- and angle- resolved photoemission spectroscopy to determine the evolution of the out-of-equilibrium electronic structure of the topological insulator Bi2Se. The response of the Fermi-Dirac distribution to ultrashort IR laser pulses has been studied by modelling the dynamics of the hot electrons after optical excitation. We disentangle a large increase of the effective temperature T* from a shift of the chemical potential mu*, which is consequence of the ultrafast photodoping of the conduction band. The relaxation dynamics of T* and mu* are k-independent and these two quantities uniquely define the evolution of the excited charge population. We observe that the energy dependence of the non-equilibrium charge population is solely determined by the analytical form of the effective Fermi-Dirac distribution.

arXiv comment5 Pages, 3 Figures

References in corpus (15)

• Topological Insulators in Three Dimensions
• Topological Insulators with Inversion Symmetry
• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
• Topological Surface States Protected From Backscattering by Chiral Spin Texture
• Tunable Multifunctional Topological Insulators in Ternary Heusler Compounds
• Control over topological insulator photocurrents with light polarization
• Coexistence of the topological state and a two-dimensional electron gas on the surface of Bi2Se3
• Ultrafast Optical Excitation of a Persistent Surface-State Population in the Topological Insulator Bi2Se3
• Measurement of intrinsic Dirac fermion cooling on the surface of a topological insulator Bi${}_2$Se${}_3$ using time- and angle-resolved photoemission spectroscopy
• Ultrafast surface carrier dynamics in the topological insulator Bi2Te3
• Observation of Single Dirac Cone Topological Surface State in Compounds TlBiTe2 and TlBiSe2 from a New Topological Insulator Family
• Giant ambipolar Rashba effect in a semiconductor: BiTeI
• Selective probing of photo-induced charge and spin dynamics in the bulk and surface of a topological insulator
• Quasi-particle scattering and protected nature of topological states in a parent topological insulator Bi${}_2$Se${}_3$

Cited by in corpus (47)

• Colloquium: Topological Band Theory
• Direct view on the ultrafast carrier dynamics in graphene
• Ultrafast helicity control of surface currents in topological insulators with near-unity fidelity
• Direct Optical Coupling to an Unoccupied Dirac Surface State in the Topological Insulator Bi${}_2$Se${}_3$
• Time- and Angle-Resolved Photoemission Studies of Quantum Materials
• Distinguishing bulk and surface electron-phonon coupling in the topological insulator Bi2Se3 using time-resolved photoemission spectroscopy
• Ultrafast Dynamics of Massive Dirac Fermions in Bilayer Graphene
• Tuning a Schottky barrier in a photoexcited topological insulator with transient Dirac cone electron-hole asymmetry
• Tunable Carrier Multiplication and Cooling in Graphene
• Gigantic surface life-time of an intrinsic topological insulator revealed via time-resolved (pump-probe) ARPES
• Spin-Polarized Surface Resonances Accompanying Topological Surface State Formation
• First-principles approach to excitons in time-resolved and angle-resolved photoemission spectra
• Ultrafast Electron Dynamics in the Topological Insulator Bi2Se3 Studied by Time-Resolved Photoemission Spectroscopy
• Energy dissipation in the time domain governed by bosons in a correlated material
• Unraveling photoinduced spin dynamics in topological insulator Bi2Se3
• Ultrafast spin polarization control of Dirac fermions in topological insulators
• Generation of Transient Photocurrents in the Topological Surface State of Sb${}_2$Te${}_3$ by Direct Optical Excitation with Mid-Infrared Pulses
• Momentum resolved spin dynamics of bulk and surface excited states in the topological insulator $\mathrm{B}{\mathrm{i}}_2\mathrm{S}{\mathrm{e}}_3$
• Ultrafast Optical Control of the Electronic Properties of $ZrT{e}_5$
• Evidence of reduced surface electron-phonon scattering in the conduction band of Bi_{2}Se_{3} by non-equilibrium ARPES
• Ultrafast Electron Dynamics in Epitaxial Graphene Investigated with Time- and Angle-Resolved Photoemission Spectroscopy
• Sub-picosecond spin dynamics of excited states in the topological insulator Bi${}_2$Te${}_3$
• Ultrafast Energy- and Momentum-resolved Surface Dirac Photocurrents in the Topological Insulator Sb${}_2$Te${}_3$
• Revealing Optical Transitions and Carrier Recombination Dynamics within the Bulk Band Structure of Bi2Se3
• Extracting the Temperature of Hot Carriers in Time- and Angle-Resolved Photoemission
• Ultrafast spin density wave transition in Chromium governed by thermalized electron gas
• Advancing time- and angle-resolved photoemission spectroscopy: The role of ultrafast laser development
• Chemical Potential Fluctuations in Topological Insulator (Bi${}_{0.5}$Sb${}_{0.5}$)${}_2$Te${}_3$ Films Visualized by Photocurrent Spectroscopy
• Hot carrier-assisted switching of the electron-phonon interaction in 1$T$-VSe${}_2$
• Transient Hot Electron Dynamics in Single-Layer TaS${}_2$
• Numerical solver for the time-dependent far-from-equilibrium Boltzmann equation
• Spatially resolved Landau level spectroscopy of the topological Dirac cone of bulk-type Sb2Te3(0001): potential fluctuations and quasiparticle lifetime
• Van der Waals engineering of ultrafast carrier dynamics in magnetic heterostructures
• Ultrafast Evolution of Bulk, Surface and Surface Resonance States in Photoexcited Bi${}_2$Te${}_3$
• Switchable quantized conductance in topological insulators revealed by the Shockley-Ramo theorem
• Photoinduced changes of the chemical potential in superconducting Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Ultrafast dynamics of photocurrents in surface states of 3D topological insulators
• Numerical scheme for the far-out-of-equilibrium time-dependent Boltzmann collision operator: 1D second-degree momentum discretisation and adaptive time stepping
• Relaxation dynamics of the optically driven nonequilibrium states in the electron- and hole-doped topological-insulator materials $(B{i}_{1-x}S{b}_x{)}_{2}T{e}_3$
• Coherence and de-coherence in the Time-Resolved ARPES of realistic materials: an ab-initio perspective
• Ultrafast relaxation of acoustic and optical phonons in a topological nodal-line semimetal ZrSiS
• Ultrafast electron dynamics at the Dirac node of the topological insulator Sb${}_2$Te${}_3$
• Numerical Solver for the out-of-equilibrium time dependent Boltzmann Collision operator: Application to 2D materials
• High-resolution MHz time- and angle-resolved photoemission spectroscopy based on a tunable vacuum ultraviolet source
• High repetition rate Time-Resolved VUV ARPES at 10.8 eV photon energy
• Transient Pauli blocking in a InN film as a mechanism for broadband ultrafast optical switching
• Terahertz electro-optic effect in Bi${}_2$Se${}_3$ crystals