Robustness of edge states in topological quantum dots against global electric field
Autor: | Ping Wang, Shu-Hui Zhang, Ding-Yang Liu, Jin-Xian Qu, Wen Yang |
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Rok vydání: | 2017 |
Předmět: |
Physics
Photon Condensed matter physics Topological degeneracy General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology Topology 01 natural sciences Topological quantum computer Symmetry protected topological order Quantum dot Quantum mechanics Topological insulator 0103 physical sciences Topological order 010306 general physics 0210 nano-technology Quantum information science |
Zdroj: | Journal of Applied Physics. 122:034307 |
ISSN: | 1089-7550 0021-8979 |
Popis: | The topological insulator has attracted increasing attention as a new state of quantum matter featured by the symmetry-protected edge states. Although the qualitative robustness of the edge states against local perturbations has been well established, it is not clear how these topological edge states respond quantitatively to a global perturbation. Here, we study the response of topological edge states in a HgTe quantum dot to an external in-plane electric field—a paradigmatic global perturbation in solid-state environments. We find that the stability of the topological edge state could be larger than that of the ground bulk state by several orders of magnitudes. This robustness may be verified by standard transport measurements in the Coulomb blockage regime. Our work may pave the way towards utilizing these topological edge states as stable memory devices for charge and/or spin information and stable emitter of single terahertz photons or entangled terahertz photon pairs for quantum communication. |
Databáze: | OpenAIRE |
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