The magnetotransport properties of epitaxial films of Cd_{3}As_{2}, a paradigm three-dimensional Dirac semimetal, are investigated. We show that an energy gap opens in the bulk electronic states of sufficiently thin films and, at low temperatures, carriers residing in surface states dominate the electrical transport. The carriers in these states are sufficiently mobile to give rise to a quantized Hall effect. The sharp quantization demonstrates surface transport that is virtually free of parasitic bulk conduction and paves the way for novel quantum transport studies in this class of topological materials. Our results also demonstrate that heterostructuring approaches can be used to study and engineer quantum states in topological semimetals.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.120.016801 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Unveiling the phases of bulk ZrTethrough magnetotransport phenomena.
Nanotechnology
December 2024
Graduate Institute of Applied Physics, National Taiwan University, Taipei 106, Taiwan.
Article Synopsis
- The study introduces a simple method to determine the topological phase of the complex quantum material ZrTe without directly examining its band structure.
- Through low-temperature electrical and magnetotransport measurements, researchers observed weak antilocalization effects and Shubnikov-de Haas oscillations, indicating the presence of multiple conducting channels.
- The findings suggest that bulk ZrTe crystals exhibit distinct transport properties, making them an exciting area for future research on quantum phases and transitions in three-dimensional quantum systems.
Unveiling the Nontrivial Electronic Structures and Fermi Topology of High-Temperature Kagome Ferrimagnet HoMnSn.
Nano Lett
December 2024
Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, Center for Neutron Science and Technology, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China.
Article Synopsis
- - High-temperature kagome magnets, like HoMnSn, are valuable for studying topological physics and have potential uses in spintronics due to their unique electron and magnetic interactions.
- - Researchers used quantum oscillation measurements and density functional theory to analyze HoMnSn, revealing high quantum mobility and complex electronic structures with both hole and electron pockets.
- - The findings indicate the presence of nontrivial topological properties in HoMnSn, suggesting its suitability for advanced applications in topological magnetoelectronics and spin-based technologies.
Statistical Signatures of Quantum Contextuality.
Entropy (Basel)
August 2024
Graduate School of Advanced Science and Engineering, Hiroshima University, Kagamiyama 1-3-1, Higashi Hiroshima 739-8530, Japan.
Quantum contextuality describes situations where the statistics observed in different measurement contexts cannot be explained by a measurement of the independent reality of the system. The most simple case is observed in a three-dimensional Hilbert space, with five different measurement contexts related to each other by shared measurement outcomes. The quantum formalism defines the relations between these contexts in terms of well-defined relations between operators, and these relations can be used to reconstruct an unknown quantum state from a finite set of measurement results.
View Article and Find Full Text PDFObservation of monopole topological mode.
Nat Commun
August 2024
Institute of Physics, Chinese Academy of Sciences/Beijing National Laboratory for Condensed Matter Physics, 100190, Beijing, China.
Among the many far-reaching consequences of the potential existence of a magnetic monopole, it induces a topological zero mode in the Dirac equation, which was derived by Jackiw and Rebbi 48 years ago and has been elusive ever since. Here, we show that the monopole and multi-monopole solutions can be constructed in the band theory by gapping the three-dimensional Dirac points in hedgehog mass configurations. We then experimentally demonstrate such a monopole bound state in an optimized Dirac acoustic crystal structurally modulated in full solid angles.
View Article and Find Full Text PDFDirac degeneracy is a fourfold band crossing point in a three-dimensional momentum space, which possesses Fermi-arc-like surface states, and has extensive application prospects. In this work, we systematically study the exceptional effects of the robust chiral surface wave supported by photonic Dirac semimetal acts on the dielectric particles. Theoretical results show that orthogonal electromagnetic modes and helical or chiral whispering gallery modes (WGMs) of dielectric particles can be efficiently excited by the unidirectional spin-polarized surface wave.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!