Counterflow superfluidity of two-species ultracold atoms in a commensurate optical lattice

被引：441

作者：

Kuklov, AB ^{[1
]}

Svistunov, BV

机构：

[1] CUNY Coll Staten Isl, Staten Isl, NY 10314 USA

[2] IV Kurchatov Atom Energy Inst, Russian Res Ctr, Moscow 123182, Russia

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.90.100401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In the Mott-insulator regime, two species of ultracold atoms in an optical lattice can exhibit the low-energy counterflow motion. We construct effective Hamiltonians for the three classes of the two-species (fermion-fermion, boson-boson, and boson-fermion-type) insulators and reveal the conditions when the resulting ground state supports super-counter-fluidity (SCF), with the alternative being phase segregation. We emphasize a crucial role of breaking the isotopic symmetry between the species for realizing the SCF phase.

引用

页数：4

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