Gigantic surface life-time of an intrinsic topological insulator revealed via time-resolved (pump-probe) ARPES

Abstract

The interaction between light and novel two-dimensional electronic states holds promise to realize new fundamental physics and optical devices. Here, we use pump-probe photoemission spectroscopy to study the optically-excited Dirac surface states in the bulk-insulating topological insulator Bi2Te2Se, and reveal optical properties that are in sharp contrast to those of bulk-metallic topological insulators. We observe a gigantic optical life-time exceeding 4 micro-sec for the surface states in Bi2Te2Se, whereas the life-time in most topological insulators such as Bi2Se3 has been limited to a few picoseconds. Moreover, we discover a surface photo-voltage in topological materials, a shift of the chemical potential of the Dirac surface states, as large as 100 mV. Our results demonstrate a rare platform to study charge excitation and relaxation in energy and momentum space in a two dimensional quantum system.

Accepted for publication in Phys. Rev. Letts (2015)

References in corpus (11)

• 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 Field Theory of Time-Reversal Invariant Insulators
• Bulk Fermi surface coexistence with Dirac surface state in Bi${}_2$Se${}_3$: a comparison of photoemission and Shubnikov-de Haas measurements
• Ultrafast Optical Excitation of a Persistent Surface-State Population in the Topological Insulator Bi2Se3
• Correlated Topological Insulators with Mixed Valence
• Photoinduced transition between conventional and topological insulators in two-dimensional electronic systems
• Ultrafast surface carrier dynamics in the topological insulator Bi2Te3
• Topological Surface States and Dirac point tuning in ternary Bi2Te2Se class of topological insulators
• Ultrafast photodoping and effective Fermi-Dirac distribution of the Dirac particles in Bi2Se3
• Time-resolved photoemission apparatus achieving sub-20-meV energy resolution and high stability

Cited by in corpus (38)

• Time- and Angle-Resolved Photoemission Studies of Quantum Materials
• Shift charge and spin photocurrents in Dirac surface states of topological insulator
• Observation of the spin-polarized surface state in a noncentrosymmetric superconductor BiPd
• Terahertz signatures of ultrafast Dirac fermion relaxation at the surface of topological insulators at room temperature
• Spin Hall photoconductance in a 3D topological insulator at room temperature
• Observation of Dirac-Like Semi-Metallic Phase in NdSb
• Revealing the ultrafast light-to-matter energy conversion before heat diffusion in a layered Dirac semimetal
• Light-Tunable Surface State and Hybridization Gap in Magnetic Topological Insulator MnBi${}_8$Te${}_{13}$
• Excitonic Gap Formation in Pumped Dirac Materials
• Extreme Ultraviolet Time- and Angle-Resolved Photoemission Spectroscopy with 21.5 meV Resolution using High-Order Harmonic Generation from a Turn-Key Yb:KGW Amplifier
• Advancing time- and angle-resolved photoemission spectroscopy: The role of ultrafast laser development
• Laser-induced persistent photovoltage on the surface of a ternary topological insulator at room temperature
• High repetition pump-and-probe photoemission spectroscopy based on a compact fiber laser system
• Electronic structure and relaxation dynamics in a superconducting topological material
• Synchrotron radiation induced magnetization in magnetically-doped and pristine topological insulators
• Electron spin dynamics of two-dimensional layered materials
• Excitonic instability in optically-pumped three-dimensional Dirac materials
• Effect of Mn doping on ultrafast carrier dynamics in thin films of the topological insulator Bi2Se3
• Impact of ultrafast transport on the high-energy states of a photoexcited topological insulator
• Role of matrix elements in the time-resolved photoemission signal
• Size Constraints on Majorana Beamsplitter Interferometer: Majorana Coupling and Surface-Bulk Scattering
• Ionic and electronic properties of the topological insulator Bi${}_2$Te${}_2$Se investigated using $\beta$-detected nuclear magnetic relaxation and resonance of ${}^8$Li
• Optical bulk-boundary dichotomy in a quantum spin Hall insulator
• Ultrafast Momentum-resolved Hot Electron Dynamics in the Two-dimensional Topological Insulator Bismuthene
• Non-adiabatic bulk-surface oscillations in driven topological insulators
• Ultrafast dynamics of photocurrents in surface states of 3D topological insulators
• Relaxation dynamics of the optically driven nonequilibrium states in the electron- and hole-doped topological-insulator materials $(B{i}_{1-x}S{b}_x{)}_{2}T{e}_3$
• Ultrafast relaxation of acoustic and optical phonons in a topological nodal-line semimetal ZrSiS
• 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
• Non-equilibrium States and Interactions in the Topological Insulator and Topological Crystalline Insulator Phases of NaCd4As3
• Switching on surface conduction in a topological insulator
• Prediction of at topological $p+ip$ excitonic insulator with parity anomaly
• Spectroscopic evidence of intra-unit-cell charge redistribution in charge-neutral magnetic topological insulator Sb-doped MnBi6Te10
• Nonequilibrium topological spin textures in momentum space
• Spin-polarized scanning tunneling microscopy measurement scheme for determining the quantum geometric tensor
• Adiabatic Green's function technique and the transient behavior in time-dependent fermion-boson coupled models
• Discovery of magnetic topological crystals