Critical surface band gap of repulsive Casimir interaction between three-dimensional topological insulators at finite temperature
Abstract
We generalize the calculation of the Casimir interaction between topological insulators with opposite topological magnetoelectric polarizabilities and finite surface band gaps to finite-temperature cases. We find that finite temperature quantitatively depresses the repulsive peak and enlarges the critical surface gap mc for the repulsive Casimir force. However, the universal property mca∼1/2 is still valid for various oscillator strengths, temperature regions, and topological magnetoelectric polarizabilities.
- Publication:
-
Physical Review B
- Pub Date:
- March 2012
- DOI:
- 10.1103/PhysRevB.85.115102
- arXiv:
- arXiv:1111.4349
- Bibcode:
- 2012PhRvB..85k5102C
- Keywords:
-
- 12.20.Ds;
- 41.20.-q;
- 73.20.-r;
- Specific calculations;
- Applied classical electromagnetism;
- Electron states at surfaces and interfaces;
- Condensed Matter - Other Condensed Matter
- E-Print:
- 7 pages, 4 figures