https://doi.org/10.1140/epjb/e2011-20671-2
Regular Article
Ground state of alkaline-earth fermionic atoms in one-dimensional optical lattices
1 Departamento de Física, Universidad Nacional de Colombia,
Bogotá, Colombia
2
Departamento de Física, Universidade Federal de
Sergipe, 49100-000
São Cristovão-SE,
Brazil
a e-mail: jsilvav@unal.edu.co
Received:
16
August
2011
Received in final form:
20
October
2011
Published online:
11
January
2012
We studied the ground state of alkaline-earth-metal atoms confined in one-dimensional optical lattices modeled by the Kondo lattice model plus a quadratic confining potential. We considered the half-filling case and both ferromagnetic and antiferromagnetic interaction between the localized and delocalized atoms. We found Kondo insulator domains that always coexist with metallic and/or band insulator regions. We observed that the on-site delocalized-localized spin correlation remains constant in the insulating regions and used it to determine the state diagrams. Metallic regions were found for both ferromagnetic and antiferromagnetic couplings.
Key words: Solid State and Materials
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2012
