Finite Conductivity in Mesoscopic Hall Bars of Inverted InAs/GaSb Quantum Wells

Abstract

We have studied experimentally the low temperature conductivity of mesoscopic size InAs/GaSb quantum well Hall bar devices in the inverted regime. Using a pair of electrostatic gates we were able to move the Fermi level into the electron-hole hybridization state, and observe a mini gap. Temperature dependence of the conductivity in the gap shows residual conductivity, which can be consistently explained by the contributions from the free as well as the hybridized carriers in the presence of impurity scattering, as proposed by Naveh and Laikhtman [Euro. Phys. Lett., 55, 545-551 (2001)]. Experimental implications for the stability of proposed helical edge states will be discussed.

5 pages, 4 figures

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• Quantum Spin Hall Effect in Graphene
• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Quantum Spin Hall Effect
• Quantum Spin Hall Effect in Inverted Type II Semiconductors
• Spin states in InAs/AlSb/GaSb semiconductor quantum wells

Cited by in corpus (42)

• Topological insulators and superconductors
• Topological Insulator Materials
• Evidence for Helical Edge Modes in Inverted InAs/GaSb Quantum Wells
• Observation of Quantum Spin Hall States in InAs/GaSb Bilayers under Broken Time-Reversal Symmetry
• Perfect Andreev Reflection of Helical Edge Modes in InAs/GaSb Quantum Wells
• Conductivity of a generic helical liquid
• Quantum Anomalous Hall Effect in Time-Reversal-Symmetry Breaking Topological Insulators
• Electric and Magnetic Tuning Between the Trivial and Topological Phases in InAs/GaSb Double Quantum Wells
• Quantum Anomalous Hall Effect in Magnetically Doped InAs/GaSb Quantum Wells
• Tuning Edge States in Strained-Layer InAs/GaInSb Quantum Spin Hall Insulators
• Atomically Thin Quantum Spin Hall Insulators
• Topological Phases in AB-Stacked MoTe${}_2$/WSe${}_2$: ${\mathbb{Z}}_2$ Topological Insulators, Chern Insulators, and Topological Charge Density Waves
• Insulating state and giant non-local response in an InAs/GaSb quantum well in the quantum Hall regime
• Non-local transport via edge-states in InAs/GaSb coupled quantum wells
• Weak Topological Insulators in PbTe/SnTe Superlattices
• Gate-controlled semimetal-topological insulator transition in an InAs/GaSb heterostructure
• Giant spin-orbit splitting in inverted InAs/GaSb double quantum wells
• Experimental Signatures of the Inverted Phase in InAs/GaSb Coupled Quantum Wells
• Criticality of the metal-topological insulator transition driven by disorder
• Suppression of bulk conductivity in InAs/GaSb broken gap composite quantum wells
• Engineering quantum spin Hall insulators by strained-layer heterostructures
• Low-Temperature Conductivity of Weakly Interacting Quantum Spin Hall Edges in Strained-Layer InAs/GaInSb
• Transport studies of electron-hole and spin-orbit interaction in GaSb/InAsSb core-shell nanowire quantum dots
• Hidden edge Dirac point and robust quantum edge transport in InAs/GaSb quantum wells
• Energy gap tuning and gate-controlled topological phase transition in InAs/In${}_x$Ga${}_{1-x}$Sb composite quantum wells
• Spin-orbit interaction in InAs/GaSb heterostructures quantified by weak antilocalization
• High mobility back-gated InAs/GaSb double quantum well grown on GaSb substrate
• Influence of etching processes on electronic transport in mesoscopic InAs/GaSb quantum well devices
• Magneto-Infrared Spectroscopic Study of Ultrathin Bi${}_2$Te${}_3$ Single Crystals
• Majorana bound states in topological insulators with hidden Dirac points
• On the impact of strain on the electronic properties of InAs/GaSb quantum well systems
• Electrical modulation of the edge channel transport in topological insulators coupled to ferromagnetic leads
• Coexistence of Topological and Normal Insulating Phases in Electro-Optically Tuned InAs/GaSb Bilayer Quantum Wells
• Electric field-induced edge state oscillations in GaSb/InAs quantum wells
• Voltage control of the quantum scattering time in InAs/GaSb/InAs trilayer quantum wells
• Impact of epitaxial strain on the topological-nontopological phase diagram and semimetallic behavior of InAs/GaSb composite quantum wells
• Measuring the Luttinger liquid parameter with shot noise
• Magneto-Induced Topological Phase Transition in Inverted InAs/GaSb Bilayers
• Quantum Phases in Twisted Homobilayer Transition Metal Dichalcogenides
• Hard wall edge confinement in 2D topological insulators and the energy of the Dirac Point
• Large inverted band-gap in strained three-layer InAs/GaInSb quantum wells
• Torsional Hall Viscosity of Massive Chern Insulators: Magnetic Field and Momentum Deformations