201. Superradiant Phase Transition in Electronic Systems and Emergent Topological Phases.
- Author
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Guerci, Daniele, Simon, Pascal, and Mora, Christophe
- Subjects
- *
PHASE transitions , *ELECTRONIC systems , *ELECTRON-electron interactions , *FERMI surfaces , *SUPERRADIANCE , *QUANTUM phase transitions , *SYMMETRY breaking - Abstract
We derive a general criterion for determining the onset of superradiant phase transition in electronic bands coupled to a cavity field, with possibly electron-electron interactions. For longitudinal superradiance in 2D or genuine 1D systems, we prove that it is always prevented, thereby extending existing no-go theorems. Instead, a superradiant phase transition can occur to a nonuniform transverse cavity field and we give specific examples in noninteracting models, either through Fermi surface nesting or parabolic band touching. Investigating the resulting time-reversal symmetry breaking superradiant states, we find in the former case Fermi surface lifting down to four Dirac points on a square lattice model, with topologically protected zero modes, and in the latter case topological bands with nonzero Chern number on an hexagonal lattice. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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