Quantum phase transition of alkaline-earth fermionic atoms confined in an optical superlattice |
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Authors: | J Silva-Valencia R Franco MS Figueira |
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Institution: | 1. Departamento de Física, Universidad Nacional de Colombia, A.A. 5997, Bogotá, Colombia;2. Instituto de Física, Universidade Federal Fluminense, Av. Litorânea s/n, 24210-346 Niterói, Rio de Janeiro, Brazil |
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Abstract: | Using the density matrix renormalization group method, we evaluate the spin and charge gaps of alkaline-earth fermionic atoms in a periodic one-dimensional optical superlattice. The number of delocalized atoms is equal to the lattice size and we consider an antiferromagnetic coupling between delocalized and localized atoms. We found a quantum phase transition from a Kondo insulator spin liquid state without confining potential to a charge-gapped antiferromagnetic state with nonzero potential. For each on-site coupling, there is a critical potential point for which the spin gap vanishes and its value increases linearly with the local interaction. |
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Keywords: | Kondo lattice model Degenerate Fermi gases Quantum phase transitions |
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