Superfluid-insulator transitions of the fermi gas with near-unitary interactions in a periodic potential

被引：40

作者：

Moon, Eun Gook ^{[1
]}

Nikolic, Predrag ^{[1
]}

Sachdev, Subir ^{[1
]}

机构：

[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 23期

关键词：

D O I：

10.1103/PhysRevLett.99.230403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We consider spin-1/2 fermions of mass m with interactions near the unitary limit. In an applied periodic potential of amplitude V and period a(L), and with a density of an even integer number of fermions per unit cell, there is a second-order quantum phase transition between superfluid and insulating ground states at a critical V = V(c). We compute the universal ratio V(c)ma(L)(2)/h(2) at N = infinity in a model with Sp(2N) spin symmetry. The insulator interpolates between a band insulator of fermions and a Mott insulator of fermion pairs. We discuss implications for recent experiments.

引用

页数：4

共 18 条

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