Berry-phase switch in electrostatically-confined topological surface states
arXiv:2203.01759 · doi:10.1103/PhysRevLett.128.126402
Abstract
Here we visualize the trapping of topological surface states in the circular n-p junctions on the top surface of the 7-quintuple-layer three dimensional (3D) topological insulator (TI) Sb2Te3 epitaxial films. As shown by spatially- and field-dependent tunneling spectra, these trapped resonances show field-induced splittings between the degenerate time-reversal-symmetric states at zero magnetic field. These behaviors are attributed unambiguously to Berry-phase switch by comparing the experimental data with both numerical and semi-classical simulations. The successful electrostatic trapping of topological surface states in epitaxial films and the observation of Berry-phase switch provide a rich platform of exploiting new ideas for TI-based quantum devices.
arXiv comment24pages,including the supplementary materials
References in corpus (24)
- Two-Dimensional Gas of Massless Dirac Fermions in Graphene
- Topological insulators and superconductors
- Berry Phase Effects on Electronic Properties
- Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
- Topological Insulators with Inversion Symmetry
- Chiral tunneling and the Klein paradox in graphene
- Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
- Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
- Quantized Anomalous Hall Effect in Magnetic Topological Insulators
- Andreev reflection and Klein tunneling in graphene
- Quantum interference and Klein tunneling in graphene heterojunctions
- Selective transmission of Dirac electrons and ballistic magnetoresistance of \textit{n-p} junctions in graphene
- Scanning Tunneling Spectroscopy of Graphene on Graphite
- Magnetic confinement of massless Dirac fermions in graphene
- Landau Quantization of Massless Dirac Fermions in Topological Insulator
- Momentum-Resolved Landau-Level Spectroscopy of Dirac Surface State in Bi2Se3
- Imaging electrostatically confined Dirac fermions in graphene quantum dots
- Landau quantization and the thickness limit of topological insulator thin films of Sb2Te3
- Creating and Probing Electron Whispering Gallery Modes in Graphene
- Fermi Level Tuning of Epitaxial Sb2Te3 Thin Films on Graphene by Regulating Intrinsic Defects and Substrate Transfer Doping
- An On/Off Berry Phase Switch in Circular Graphene Resonators
- Magnetically Defined Qubits on 3D Topological Insulators
- Interaction Driven Quantum Hall Wedding cake-like Structures in Graphene Quantum Dots
- Berry phase jumps and giant nonreciprocity in Dirac quantum dots