Band resolved imaging of photocurrent in a topological insulator

Abstract

We study the microscopic origins of photocurrent generation in the topological insulator Bi${}_2$Se${}_3$ via time- and angle-resolved photoemission spectroscopy. We image the unoccupied band structure as it evolves following a circularly polarized optical excitation and observe an asymmetric electron population in momentum space, which is the spectroscopic signature of a photocurrent. By analyzing the rise times of the population we identify which occupied and unoccupied electronic states are coupled by the optical excitation. We conclude that photocurrents can only be excited via resonant optical transitions coupling to spin-orbital textured states. Our work provides a microscopic understanding of how to control photocurrents in systems with spin-orbit coupling and broken inversion symmetry.

References in corpus (22)

• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• First direct observation of Spin-textures in Topological Insulators : Spin-resolved ARPES as a probe of topological quantum spin Hall effect and Berry's phase
• Quantized circular photogalvanic effect in Weyl semimetals
• Strong surface scattering in ultrahigh mobility Bi2Se3 topological insulator crystals
• Direct optical detection of Weyl fermion chirality in a topological semimetal
• Ultrafast Optical Excitation of a Persistent Surface-State Population in the Topological Insulator Bi2Se3
• Ultrafast photocurrents at the surface of the three-dimensional topological insulator ${\mathrm{Bi}}_2{\mathrm{Se}}_3$
• Ultrafast helicity control of surface currents in topological insulators with near-unity fidelity
• Maximal Rashba-like spin splitting via kinetic energy-driven inversion symmetry breaking
• Why is the bulk resistivity of topological insulators so small?
• Spin-Polarized Surface Resonances Accompanying Topological Surface State Formation
• Helicity dependent photocurrent in electrically gated (Bi,Sb)_2Te_3 thin films
• 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 $\mathrm{B}{\mathrm{i}}_2\mathrm{S}{\mathrm{e}}_3$
• Unoccupied Topological States on Bismuth Chalcogenides
• 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${}_3$
• Observation of Chiral Surface Excitons in a Topological Insulator Bi${}_2$Se${}_3$
• Determine the chirality of Weyl fermions from the circular dichroism spectra of time-dependent ARPES
• Revealing the Coulomb interaction strength in a cuprate superconductor

Cited by in corpus (34)

• Time- and Angle-Resolved Photoemission Studies of Quantum Materials
• Quantum frequency doubling in the topological insulator Bi2Se3
• Are there universal signatures of topological phases in high harmonic generation? Probably not
• Phonon-induced Floquet second-order topological phases protected by space-time symmetries
• Tuning time and energy resolution in time-resolved photoemission spectroscopy with nonlinear crystals
• Observation of Chiral Surface Excitons in a Topological Insulator Bi${}_2$Se${}_3$
• A time- and angle-resolved photoemission spectroscopy with probe photon energy up to 6.7 eV
• Dynamical separation of bulk and edge transport in HgTe-based 2D topological insulators
• Advancing time- and angle-resolved photoemission spectroscopy: The role of ultrafast laser development
• Detecting light-induced Floquet band gaps of graphene via trARPES
• Photocurrent generation in solids via linearly polarized laser
• Mapping light-dressed Floquet bands by highly nonlinear optical excitations and valley polarization
• Berry Curvature Signatures in Chiroptical Excitonic Transitions
• Band nonlinearity-enabled manipulation of Dirac nodes, Weyl cones, and valleytronics with intense linearly polarized light
• An Integrated Quantum Material Testbed with Multi-Resolution Photoemission Spectroscopy
• Transition radiation in photonic topological crystals: quasi-resonant excitation of robust edge states by a moving charge
• Tailoring Photocurrent in Weyl Semimetals via Intense Laser Irradiation
• Exchange-Driven Intermixing of Bulk and Topological Surface State by Chiral Excitons in Bi2Se3
• Optical Control of Ultrafast Photocurrent in Graphene
• Photocurrent-driven transient symmetry breaking in the Weyl semimetal TaAs
• Ultrafast dynamics of photocurrents in surface states of 3D topological insulators
• Non-contact mutual inductance based measurement of an inhomogeneous topological insulating state in Bi2Se3 single crystals with defects
• Electronic and Vibrational Excitations on the Surface of the Three-Dimensional Topological Insulator Bi${}_2$Te${}_{3-x}$Se${}_x$ (x = 0, 2, 3)
• Generalized Linear Response Theory for Pumped Systems and its Application to Transient Optical Properties
• Noncollinear Magnetic Modulation of Weyl Nodes in Ferrimagnetic Mn${}_3$Ga
• Orbital contributions in the element-resolved valence electronic structure of Bi2Se3
• Two-photon IR pumped UV-Vis transient absorption spectroscopy of Dirac fermions in the 2D and 3D topological insulator Bi2Se3
• Topological Insulator Metamaterial with Giant Circular Photogalvanic Effect
• Resonant laser excitation and time-domain imaging of chiral topological polariton edge states
• Ultrafast electron dynamics in a topological surface state observed in two-dimensional momentum space
• Control of intervalley scattering in Bi${}_2$Te${}_3$ via temperature-dependent band renormalization
• Largely enhanced photogalvanic effects in the phosphorene photodetector by strain-increased device asymmetry
• Terahertz electro-optic effect in Bi${}_2$Se${}_3$ crystals
• Time- and angle-resolved photoelectron spectroscopy of strong-field light-dressed solids: prevalence of the adiabatic band picture