Magnetic Phases of Fermionic Atoms Confined in 1-D Optical Superlattice

Author

Silva-Valencia, J. ; Franco, Ricardo ; Figueira, M.S.

Author_Institution

Dept. de Fis., Univ. Nac. de Colombia, Bogota, Colombia

Volume

49

Issue

8

fYear

2013

fDate

Aug. 2013

Firstpage

4679

Lastpage

4682

Abstract

We study the ground state of alkaline-earth fermionic atoms confined in a one-dimensional optical superlattice, when the number of delocalized atoms is one-fourth the number of system sites. We used the density matrix renormalization group method and found a paramagnetic to ferromagnetic quantum phase transition for any value of the potential strength. The local critical antiferromagnetic coupling decreases as the superlattice potential increases.

Keywords

Kondo effect; alkaline earth metals; fermion systems; ferromagnetic-paramagnetic transitions; magnetic moments; optical multilayers; renormalisation; superlattices; 1D optical superlattice; alkaline earth fermionic atoms; delocalized atoms; density matrix renormalization group method; ground state; local critical antiferromagnetic coupling; magnetic phases; paramagnetic-ferromagnetic quantum phase transition; potential strength; superlattice potential; Atom optics; Correlation; Couplings; Lattices; Optical superlattices; Stationary state; Magnetic moments; magnetic properties;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2013.2261478

Filename

6566184