Seminário de Matéria Condensada - 25/06/2015, 11:00, Sala de reuniões do 1P

Small coupling magnetism in a Kondo lattice model with a superlattice potential

Jereson Silva-Valencia - Univ. Nacional de Colombia

Over the last few years several proposals to simulate the Kondo lattice model with cold atoms were made. For instance, Gorshkov et al. [Nature Phys. 6, 289 (2010)] proposed that 171Yb atoms in the 1S0 (g) and 3P0 (e) states can be confined independently in two different optical lattice potentials with the same periodicity. If we consider a high repulsion interaction between the e localized atoms, we can simulate diverse Kondo lattice problems, where the free g atoms are exposed to different confining potentials [PRA 81, 051603, 2010; Eur. Phys. J. B, 85, 5 ( 2012)]. In the present paper, we study the ground state of a Kondo lattice model, where the free carries undergo a superlattice potential. With this model, which is feasible with the current cold atom setups, we show that it is possible to obtain a magnetic order for small local couplings in one dimension. We found an antiferromagnetic phase, which is absent in the original model but common for Kondo lattice materials. For small local couplings and large superlattice strength potentials, we found a ferromagnetic-antiferromagnetic ground state crossover when the global commensurate density increases.

jereson.txt · Last modified: 2015/06/08 10:53 by moutinho
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