Tuning multiple Landau Quantization in Transition-Metal Dichalcogenide with Strain
arXiv:2304.14673 · doi:10.1021/acs.nanolett.3c00110
Abstract
Landau quantization associated with the quantized cyclotron motion of electrons under magnetic field provides the effective way to investigate topologically protected quantum states with entangled degrees of freedom and multiple quantum numbers. Here we report the cascade of Landau quantization in a strained type-II Dirac semimetal NiTe2 with spectroscopic-imaging scanning tunneling microscopy. The uniform-height surfaces exhibit single-sequence Landau levels (LLs) at a magnetic field originating from the quantization of topological surface state (TSS) across the Fermi level. Strikingly, we reveal the multiple sequence of LLs in the strained surface regions where the rotation symmetry is broken. Firstprinciples calculations demonstrate that the multiple LLs attest to the remarkable lifting of the valley degeneracy of TSS by the in-plane uniaxial or shear strains. Our findings pave a pathway to tune multiple degrees of freedom and quantum numbers of TMDs via strain engineering for practical applications such as high-frequency rectifiers, Josephson diode and valleytronics.
arXiv commentNano Letters 23, 3274 (2023)
References in corpus (28)
- Spintronics: Fundamentals and applications
- Commensurate-incommensurate transition for graphene on hexagonal boron nitride
- Evidence for Majorana bound state in an iron-based superconductor
- Observation of topological superconductivity on the surface of an iron-based superconductor
- Discovery of a quantum limit Chern magnet TbMn6Sn6
- Landau Quantization and Quasiparticle Interference in the Three-Dimensional Dirac Semimetal Cd3As2
- Mapping the twist angle and unconventional Landau levels in magic angle graphene
- Landau Quantization of Massless Dirac Fermions in Topological Insulator
- Topological Berry phase and semiclassical quantization of cyclotron orbits for two dimensional electrons in coupled band models
- Ubiquitous formation of bulk Dirac cones and topological surface states from a single orbital manifold in transition-metal dichalcogenides
- Mimicking cuprates: large orbital polarization in a metallic square-planar nickelate
- Pseudospin-valley coupled edge states in a photonic topological insulator
- Observation of Topological Superconductivity in a Stoichiometric Transition Metal Dichalcogenide 2M-WS2
- Fermiology and Superconductivity of Topological Surface States in PdTe
- Observation of a Nematic Quantum Hall Liquid on the Surface of Bismuth
- Low-energy type-II Dirac fermions and spin-polarized topological surface states in transition-metal dichalcogenide NiTe
- Landau Quantization and Highly Mobile Fermions in an Insulator
- Evolution of Landau Levels into Edge States at an Atomically Sharp Edge in Graphene
- Fermi-crossing Type-II Dirac fermions and topological surface states in NiTe2
- Emergent superconductivity in two-dimensional NiTe crystals
- Observation of spontaneous valley polarization of itinerant electrons
- Landau levels in the case of two degenerate coupled bands: kagome lattice tight-binding spectrum
- Properties and superconductivity in Ti-doped NiTe2 single crystals
- Two distinct superconducting states controlled by orientation of local wrinkles in LiFeAs
- Landau quantization of nearly degenerate bands, and full symmetry classification of avoided Landau-level crossings
- Emergent superconductivity by Re doping in type -II Weyl semimetal NiTe2
- Nanoscale Determination of the Mass Enhancement Factor in the Lightly-Doped Bulk Insulator Lead Selenide
- Observation of Landau quantization and standing waves in HfSiS