Spinful bosons in an optical lattice
2006 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 74, no 5, 053419-1-053419-8 p.Article in journal (Refereed) Published
We analyze the behavior of cold spin-1 particles with antiferromagnetic interactions in a one-dimensional optical lattice using density matrix renormalization group calculations. Correlation functions and the dimerization are shown and we also present results for the energy gap between ground state and the spin excited states. We confirm the anticipated phase diagram, with Mott-insulating regions of alternating dimerized S=1 chains for odd particle density versus on-site singlets for even density. We find no evidence for any additional ordered phases in the physically accessible region, however for sufficiently large spin interaction, on-site singlet pairs dominate leading, for odd density, to a breakdown of the Mott insulator or, for even density, a real-space singlet superfluid.
Place, publisher, year, edition, pages
2006. Vol. 74, no 5, 053419-1-053419-8 p.
QUANTUM RENORMALIZATION-GROUPS; DIMERIZATION; TRANSITION; SUPERFLUID; INSULATOR; SPECTRUM; CHAINS; STATES; ATOMS; ORDER
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:kth:diva-6798DOI: 10.1103/PhysRevA.74.053419ISI: 000242408900114OAI: oai:DiVA.org:kth-6798DiVA: diva2:11609
QC 201006282007-02-202007-02-202010-12-03Bibliographically approved