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- W4321471544 abstract "For bosons with flat energy dispersion, condensation can occur in different symmetry sectors. Here, we consider bosons in a Kagome lattice with $pi$-flux hopping, which in the presence of mean-field interactions exhibit degenerate condensates in the $Gamma$- and the $K$-point. We analyze the excitation above both condensates and find strikingly different properties: For the $K$-point condensate, the Bogoliubov-de Gennes (BdG) Hamiltonian has broken particle-hole symmetry (PHS) and exhibits a topologically trivial quasiparticle band structure. However, band flatness plays a key role in breaking the time reversal symmetry (TRS) of the BdG Hamiltonian for a $Gamma$-point condensate. Consequently, its quasiparticle band structure exhibits non-trivial topology, characterized by non-zero Chern numbers and the presence of edge states. Although quantum fluctuations energetically favor the $K$-point condensate, the interesting properties of the $Gamma$-point condensate become relevant for anisotropic hopping. The topological properties of the $Gamma$-point condensate get even richer in the presence of extended Bose-Hubbard interactions. We find a topological phase transition into a topological condensate characterized by high Chern number and also comment on the realization and detection of such excitations." @default.
- W4321471544 created "2023-02-22" @default.
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- W4321471544 date "2023-02-20" @default.
- W4321471544 modified "2023-09-25" @default.
- W4321471544 title "Topological Bogoliubov quasiparticles from Bose-Einstein condensate in a flat band system" @default.
- W4321471544 doi "https://doi.org/10.48550/arxiv.2302.09910" @default.
- W4321471544 hasPublicationYear "2023" @default.
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