Ultrafast carrier dynamics in thin-films of the topological insulator Bi2Se3

Abstract

Transient reflectivity measurements of thin films, ranging from 6 to 40 nm in thickness, of the topological insulator Bi2Se3 revealed a strong dependence of the carrier relaxation time on the film thickness. For thicker films the relaxation dynamics are similar to those of bulk Bi2Se3, where the contribution of the bulk insulating phase dominates over that of the surface metallic phase. The carrier relaxation time shortens with decreasing film thickness, reaching values comparable to those of noble metals. This effect may result from the hybridization of Dirac cone states at the opposite surfaces for the thinnest films.

References in corpus (11)

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• Nonlinear optical probe of tunable surface electrons on a topological insulator
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Cited by in corpus (46)

• Colloquium: Topological Band Theory
• Direct visualization of current induced spin accumulation in topological insulators
• Floquet Weyl Semimetal Induced by Off-Resonant Light
• Distinguishing bulk and surface electron-phonon coupling in the topological insulator Bi2Se3 using time-resolved photoemission spectroscopy
• Nonlinear spin current generation in noncentrosymmetric spin-orbit coupled systems
• Ultrafast Electron Dynamics in the Topological Insulator Bi2Se3 Studied by Time-Resolved Photoemission Spectroscopy
• Unraveling photoinduced spin dynamics in topological insulator Bi2Se3
• Milliwatt terahertz harmonic generation from topological insulator metamaterials
• Effect of carrier recombination on ultrafast carrier dynamics in thin films of the topological insulator Bi2Se3
• Terahertz signatures of ultrafast Dirac fermion relaxation at the surface of topological insulators at room temperature
• Coherent control of injection currents in high-quality films of Bi2Se3
• Clarifying ultrafast carrier dynamics in ultrathin films of the topological insulator Bi2Se3 using transient absorption spectroscopy
• Acoustic phonon dynamics in thin-films of the topological insulator Bi2Se3
• Nonlinear Optical Observation of Coherent Acoustic Dirac Plasmons in Thin-Film Topological Insulators
• Resonance-type thickness dependence of optical second harmonic generation in thin-films of the topological insulator Bi2Se3
• Thickness tunable quantum interference between surface phonon and Dirac plasmon states in thin-films of the topological insulator Bi2Se3
• Plasmon-enhanced electron-phonon coupling in Dirac surface states of the thin-film topological insulator Bi2Se3
• Revealing Optical Transitions and Carrier Recombination Dynamics within the Bulk Band Structure of Bi2Se3
• Helicity dependent photovoltaic effect in Bi2Se3 under normal incident light
• Progress in epitaxial thin-film Na3Bi as a topological electronic material
• Photocurrents in Bi2Se3: bulk versus surface, and injection versus shift currents
• Ultrafast carrier-lattice interactions and interlayer modulations of Bi2Se3 by X-ray free electron laser diffraction
• Tunable Electronic Properties and Large Rashba Splittings Found in Few-Layer Bi${}_2$Se${}_3$/PtSe${}_2$ Van der Waals Heterostructures
• Controlling electron propagation on a topological insulator surface via proximity interactions
• Nanoscale $\beta$-Nuclear Magnetic Resonance Depth Imaging of Topological Insulators
• Effect of Mn doping on ultrafast carrier dynamics in thin films of the topological insulator Bi2Se3
• Nonequilibrium Electron Dynamics In Pump-Probe Spectroscopy: Role Of Excited Phonon Populations
• Role of matrix elements in the time-resolved photoemission signal
• Surface Optical and Bulk Acoustic Phonons in the Topological Insulator, Bi2Se2Te
• Phonon-driven ultrafast symmetry lowering in a Bi${}_2$Se${}_3$ crystal
• Phase transitions in intrinsic magnetic topological insulator with high-frequency pumping
• Non-linear antidamping spin-orbit torque originating from intra-band transport on the warped surface of a topological insulator
• Coherent surface-to-bulk vibrational coupling in the 2D topologically trivial insulator Bi2Se3 monitored by ultrafast transient absorption spectroscopy
• Controlling surface charge and spin density oscillations by Dirac plasmon interaction in thin topological insulators
• Quantum Transport in Air-stable Na3Bi Thin Films
• Dynamic Opening of a Gap in Dirac Surface States of the Thin-Film 3D Topological Insulator Bi2Se3 Driven by the Dynamic Rashba Effect
• THz Photodetector using sideband-modulated transport through surface states of a 3D Topological Insulator
• Comment on 'Unraveling Photoinduced Spin Dynamics in the Topological Insulator Bi2Se3'
• Multiphoton-pumped UV-Vis transient absorption spectroscopy of 2D materials: basic concepts and recent applications
• Two-photon IR pumped UV-Vis transient absorption spectroscopy of Dirac fermions in the 2D and 3D topological insulator Bi2Se3
• Ultrafast transient absorption spectroscopy of 2D semiconductors: a review
• Ultrafast switching of topological invariants by light-driven strain
• Ultrafast scattering dynamics of coherent phonons in Bi${}_{1-x}$Sb${}_x$ in the Weyl semimetal phase
• Non-equilibrium States and Interactions in the Topological Insulator and Topological Crystalline Insulator Phases of NaCd4As3
• Terahertz emission from metal nanoparticles due to ultrafast heating
• Research on topological materials using ultrafast spectroscopy