Novel route to a finite center-of-mass momentum pairing state for superconductors: A current-driven Fulde-Ferrell-Larkin-Ovchinnikov state

被引：18

作者：

Doh, Hyeonjin ^{[1
]}

Song, Matthew ^{[1
]}

Kee, Hae-Young ^{[1
]}

机构：

[1] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 25期

关键词：

13;

D O I：

10.1103/PhysRevLett.97.257001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The previously studied Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state is stabilized by a magnetic field via the Zeeman coupling in spin-singlet superconductors. Here we suggest a novel route to achieve nonzero center-of-mass momentum pairing states in superconductors with Fermi surface nesting. We investigate two-dimensional superconductors under a uniform external current, proportional to a finite pair momentum of q(e). We find that an FFLO state with a spontaneous pair momentum of q(s) is stabilized above a certain critical current that depends on the direction of the external current. A finite qs arises in order to make the total pair-momentum of q(t)(= q(s) + q(e)) perpendicular to the nesting vector, which is independent of spin states of Cooper pairs. We also discuss experimental signatures of the FFLO state.

引用

页数：4