Probing quantum capacitance in a 3D topological insulator

Abstract

We measure the quantum capacitance and probe thus directly the electronic density of states of the high mobility, Dirac type of two-dimensional electron system, which forms on the surface of strained HgTe. Here we show that observed magneto-capacitance oscillations probe, in contrast to magnetotransport, primarily the top surface. Capacitance measurements constitute thus a powerful tool to probe only one topological surface and to reconstruct its Landau level spectrum for different positions of the Fermi energy.

5 pages of the main text with 3 figures + 10 appendix pages with 7 figures

References in corpus (13)

• Topological Insulators
• Topological insulators and superconductors
• Quantum Spin Hall Effect in Graphene
• Topological Insulators with Inversion Symmetry
• Topological Insulator Materials
• Quantum Hall Effect from the Topological Surface States of Strained Bulk HgTe
• Berry phase of non-ideal Dirac fermions in topological insulators
• Non-sinusoidal current-phase relationship in Josephson junctions from the 3D topological insulator HgTe
• Transport properties of a 3D topological insulator based on a strained high mobility HgTe film
• Cyclotron Resonance Assisted Photocurrents in Surface States of a 3D Topological Insulator Based on a Strained High Mobility HgTe Film
• Terahertz Quantum Hall Effect in a Topological Insulator
• Room temperature electrically tunable broadband terahertz Faraday effect
• Self-consistent $\text{k}\cdot \text{p}$ calculations for gated thin layers of 3D Topological Insulators

Cited by in corpus (30)

• Probing Spin Helical Surface States in Topological HgTe Nanowires
• Observation of Volkov-Pankratov states in topological HgTe heterojunctions using high-frequency compressibility
• Ballistic geometric resistance resonances in a single surface of a topological insulator
• Topological insulators based on HgTe
• Dynamical separation of bulk and edge transport in HgTe-based 2D topological insulators
• Quantum Hall effect and Landau levels in the 3D topological insulator HgTe
• Topological states in superlattices of HgTe-class materials for engineering three-dimensional flat bands
• Band structure of a HgTe-based three-dimensional topological insulator
• Landau Levels of Topologically-Protected Surface States Probed by Dual-Gated Quantum Capacitance
• Gate-induced decoupling of surface and bulk state properties in selectively-deposited Bi${}_2$Te${}_3$ nanoribbons
• Simple mechanisms that impede the Berry phase identification from magneto-oscillations
• Topological surface states in thick partially relaxed HgTe film
• Band Structure of Two-dimensional Dirac Semimetal from Cyclotron Resonance
• 2D-Dirac surface states and bulk gap probed via quantum capacitance in a 3D topological insulator
• Energy spectrum of semimetallic HgTe quantum wells
• Superradiant and transport lifetimes of the cyclotron resonance in the topological insulator HgTe
• Terahertz photoresistivity of a high-mobility 3D topological insulator based on a strained HgTe film
• Terahertz Magnetospectroscopy of Cyclotron Resonances from Topological Surface States in Thick Films of Cd${}_x$Hg${}_{1-x}$Te
• Hybridization of topological surface states with a flat band
• Revealing topological Dirac fermions at the surface of strained HgTe thin films via Quantum Hall transport spectroscopy
• Quantum capacitance of an HgTe quantum well as an indicator of the topological phase
• Cyclotron resonance induced photogalvanic effect in surface states of 200 nm thick strained HgTe films
• Transport properties of a 1000-nm HgTe film: the interplay of surface and bulk carriers
• Transformation of an energy spectrum and wave functions in the crossover from two- to three-dimensional topological insulator in HgTe quantum wells: long and thorny way
• Anomalous Decay of Quantum Resistance Oscillations of Two Dimensional Helical Electrons in Magnetic Field
• Spin splitting of surface states in HgTe quantum wells
• Thermoelectric transport in a three-dimensional HgTe topological insulator
• Weak antilocalization in partially relaxed 200-nm HgTe films
• Anomalous conductance steps in three-dimensional topological insulator HgTe-based quantum point contacts
• Self-Consistent Model for Gate Control of Narrow-, Broken-, and Inverted-Gap (Topological) Heterostructures