Title :
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
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;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2013.2261478
