Enhanced electron dephasing in three-dimensional topological insulators

Abstract

Study of the dephasing in electronic systems is not only important for probing the nature of their ground states, but also crucial to harnessing the quantum coherence for information processing. In contrast to well-studied conventional metals and semiconductors, it remains unclear which mechanism is mainly responsible for electron dephasing in three-dimensional (3D) topological insulators (TIs). Here, we report on using weak antilocalization effect to measure the dephasing rates in highly tunable (Bi,Sb)${}_2$Te${}_3$ thin films. As the transport is varied from a bulk-conducting regime to surface-dominant transport, the dephasing rate is observed to evolve from a linear temperature dependence to a sublinear power-law dependence. While the former is consistent with the Nyquist electron-electron interactions commonly seen in ordinary 2D systems, the latter leads to enhanced electron dephasing at low temperatures and is attributed to the coupling between the surface states and the localized charge puddles in the bulk of 3D TIs.

18 pages, 4 figures, supplemental information available upon request or visit the ncomms website

References in corpus (43)

• Topological Insulators
• Topological insulators and superconductors
• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Search for Majorana fermions in superconductors
• Topological Insulator Materials
• Aharonov-Bohm interference in topological insulator nanoribbons
• Large bulk resistivity and surface quantum oscillations in the topological insulator Bi2Te2Se
• Gate-Voltage Control of Chemical Potential and Weak Anti-localization in Bismuth Selenide
• Electrically detected interferometry of Majorana fermions in a topological insulator
• Band structure engineering in (Bi1-xSbx)2Te3 ternary topological insulators
• Probing Neutral Majorana Fermion Edge Modes with Charge Transport
• Bulk Band Gap and Surface State Conduction Observed in Voltage-Tuned Crystals of the Topological Insulator Bi${}_2$Se${}_3$
• Observation of topological surface state quantum Hall effect in an intrinsic three-dimensional topological insulator
• Ambipolar Field Effect in Topological Insulator Nanoplates of (BixSb1-x)2Te3
• Observation of Dirac Holes and Electrons in a Topological Insulator
• Electrically tunable surface-to-bulk coherent coupling in topological insulator thin films
• Spatial Fluctuations of Helical Dirac Fermions on the Surface of Topological Insulators
• Thickness-dependent bulk properties and weak anti-localization effect in topological insulator Bi2Se3
• Tunable Surface Conductivity in Bi2Se3 Revealed in Diffusive Electron Transport
• Helical edge resistance introduced by charge puddles
• Quantum Hall Effect on Top and Bottom Surface States of Topological Insulator (Bi1-xSbx)2Te3 Films
• Quantum interference and Aharonov-Bohm oscillations in topological insulators
• Topology, Delocalization via Average Symmetry and the Symplectic Anderson Transition
• Weak Localization and Antilocalization in Topological Insulator Thin Films with Coherent Bulk-Surface Coupling
• Low carrier concentration crystals of the topological insulator Bi${}_2$Te${}_2$Se
• Weak antilocalization in topological insulator Bi${}_2$Te${}_3$ microflakes
• Interaction-induced criticality in Z_2 topological insulators
• Surface dominated transport in single crystalline nanoflake devices of topological insulator Bi1.5Sb0.5Te1.8Se1.2
• Coherent Topological Transport on the Surface of Bi2Se3
• Resistance of helical edges formed in a semiconductor heterostructure
• Emergence of decoupled surface transport channels in bulk insulating Bi2Se3 thin films
• Why is the bulk resistivity of topological insulators so small?
• Topological insulator: a new quantized spin Hall resistance robust to dephasing
• Observation of Anderson localization in ultrathin films of three-dimensional topological insulators
• Gate-tuned Differentiation of Surface-conducting States in Bi1.5Sb0.5Te1.7Se1.3 Topological-insulator Thin Crystals
• Energy transport in the Anderson insulator
• Revealing puddles of electrons and holes in compensated topological insulators
• Magnetoresistance and dephasing in a two-dimensional electron gas at intermediate conductances
• Electron coherence at low temperatures: The role of magnetic impurities
• Weak antilocalization in HgTe quantum well with inverted energy spectrum
• Interaction and disorder effects in 3D topological insulator thin films
• Microwave-Induced Dephasing in One-Dimensional Metal Wires
• Indications of the topological transport by the universal conductance fluctuations in the Bi2Te2Se microflakes

Cited by in corpus (19)

• Transport in two-dimensional topological materials: recent developments in experiment and theory
• Observation of spin-momentum locked surface states in amorphous Bi${}_2$Se${}_3$
• Bulk and surface states carried supercurrent in ballistic Nb-Dirac semimetal Cd3As2 nanowire-Nb junctions
• Topological quantum phase transition in magnetic topological insulator upon magnetization rotation
• Low temperature saturation of phase coherence length in topological insulators
• Observation of multichannel quantum coherent transport and electron-electron interaction in Bi2Te3 single crystal
• Phase transition and anomalous scaling in the quantum Hall transport of topological insulator Sn-Bi1.1Sb0.9Te2S devices
• Current scaling of the topological quantum phase transition between a quantum anomalous Hall insulator and a trivial insulator
• Universal conductance fluctuations and direct observation of crossover of symmetry classes in topological insulators
• Spatially varying electronic dephasing in three dimensional topological insulators
• Quantum corrections to the magnetoconductivity of surface states in three-dimensional topological insulators
• Observation of long phase-coherence length in epitaxial La-doped CdO thin films
• Robust Gapless Surface State against Surface Magnetic Impurities on (Bi${}_{0.5}$Sb${}_{0.5}$)${}_2$Te${}_3$ Evidenced by In Situ Magnetotransport Measurements
• Enhanced coherence and decoupled surface states in topological insulators through structural disorder
• Thickness dependence of electron-electron interactions in topological p-n junctions
• Identifying the fingerprints of topological states by tuning magnetoresistance in a semimetal: the case of topological half-Heusler Pt1-xAuxLuSb
• Electronic transport in thin films of BaPbO${}_3$: Unraveling two-dimensional quantum effects
• Surface-bulk coupling in a Bi${}_2$Te${}_3$ nanoplate grown by van der Waals epitaxy
• Influence of Device Geometry on Transport Properties of Topological Insulator Microflakes