Edge States of an Excitonic Insulator with the Spin—Orbit Interaction
| Autor: | V. V. Val’kov |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Physics and Astronomy (miscellaneous) Condensed matter physics Solid-state physics Exchange interaction Spin–orbit interaction Fermion Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 01 natural sciences 010305 fluids & plasmas Metastability 0103 physical sciences Coulomb 010306 general physics Ground state Quantum well |
| Zdroj: | JETP Letters. 111:647-652 |
| ISSN: | 1090-6487 0021-3640 |
| DOI: | 10.1134/s0021364020110107 |
| Popis: | The effect of the spin-orbit and Coulomb interactions on the symmetry and topological properties of the s, p, d, and s + d phases of an excitonic insulator has been considered by example of the inverted two-band structure of the HgTe quantum well. It has been found that only the p phase has a nontrivial topology, but it is metastable. It has been shown that the exchange interaction between fermions induces the ground state with the s + d symmetry of the excitonic order parameter. This phase of the excitonic insulator has zero Chern number; nevertheless, edge states occur in the case of open boundaries. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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