Phase separation in a two-species Bose mixture

Journal Article · Sun Jul 15 00:00:00 EDT 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.76.013604· OSTI ID:21011273

Mishra, Tapan; Das, B P ^[1]; Pai, Ramesh V ^[2]

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1. Indian Institute of Astrophysics, II Block, Kormangala, Bangalore, 560 034 (India)
2. Department of Physics, Goa University, Taleigao Plateau, Goa 403 206 (India)

We obtain the ground-state quantum phase diagram for a two-species Bose mixture in a one-dimensional optical lattice using the finite-size density-matrix renormalization group method. We discuss our results for different combinations of inter- and intraspecies interaction strengths with commensurate and incommensurate fillings of the bosons. The phases we have obtained are a superfluid and a Mott insulator, and a phase separation where the two different species reside in spatially separate regions. The spatially separated phase is further classified into phase-separated superfluid and Mott insulator. The phase separation appears for all the fillings we have considered, whenever the interspecies interaction is slightly larger than the intraspecies interactions.

• OSTI ID: 21011273
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 1 Vol. 76; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BOSONS
DENSITY MATRIX
GROUND STATES
INTERACTIONS
MIXTURES
ONE-DIMENSIONAL CALCULATIONS
OPTICAL MODELS
PHASE DIAGRAMS
RENORMALIZATION
SUPERFLUIDITY