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Realization Conditions and the Magnetic Field Dependence of Corner Excitations in the Topological Insulator with Superconducting Coupling on the Triangular Lattice.
- Source :
-
Journal of Experimental & Theoretical Physics . Jul2021, Vol. 133 Issue 1, p71-76. 6p. - Publication Year :
- 2021
-
Abstract
- The studies of the topological properties of systems have recently been extended due to a new concept of higher-order topological insulators and superconductors. Many models were proposed for two-dimensional systems on a square lattice, where corner excitations can appear; however, the problem of existence of such excitations in superconducting systems with a triangular crystal lattice is still poorly understood. Using a topological insulator in the form of a triangle with a chiral superconducting order parameter as an example, we shows that corner excitations can exist in C3-symmetric systems. In spite of a nontopological character, these excitations have energies inside the gap of the first-order edge excitation spectrum over a wide parameter range and are well localized at the corners of the system. Gapless corner excitations are shown to exist in the system at certain parameters. The application of a magnetic field in the system plane removes the triple degeneracy of the corner excitation energy and makes it possible to control the position of the minimum-energy corner excitation using a magnetic field. At the same time the fine adjustment to achieve the gapless excitations at the chosen corner can be made with changing of the magnetic field value. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10637761
- Volume :
- 133
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Journal of Experimental & Theoretical Physics
- Publication Type :
- Academic Journal
- Accession number :
- 152351497
- Full Text :
- https://doi.org/10.1134/S1063776121060029