Fulde-Ferrell-Larkin-Ovchinikov states in a superconducting ring with magnetic fields: Phase diagram and the first-order phase transitions
Fulde-Ferrell-Larkin-Ovchinikov states in a superconducting ring with magnetic fields: Phase diagram and the first-order phase transitions
复制标题
具有磁场的超导环中的 Fulde-Ferrell-Larkin-Ovchinikov 态：相图和一阶相变
DOI：
10.1103/physrevb.92.224512
复制
发表时间：
2015
影响因子：
3.7
通讯作者：
and M. Nitta
中科院分区：
文献类型：
--
作者：
R. Yoshii;S. Takada;S. Tsuchiya;G. Marmorini;H. Hayakawa;and M. Nitta
我们发现角Fulde-Ferrell-Larkin-Ovchinnikov（FFLO）状态（或扭曲扭结晶体）中的相位和振幅的一对潜在的调制同时在一个准一维超导环上施加静态塞曼磁场和静态Aharonov-Bohm磁通穿过环。具有磁通量的超导环产生持续电流，而费米能的塞曼分裂导致对势的空间调制。我们表明，这两个磁场稳定的FFLO相位在一个大的参数区域的磁场。我们进一步绘制了两种一级相变的相图;一种对应于分离Aharonov-Bohm磁通量的相位滑移，另一种对应于分离塞曼磁场的成对振幅的峰的数量。
We find the angular Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) states (or the twisted kink crystals) in which a phase and an amplitude of a pair potential modulate simultaneously in a quasi-one-dimensional superconducting ring with a static Zeeman magnetic field applied on the ring and static Aharonov-Bohm magnetic flux penetrating the ring. The superconducting ring with magnetic flux produces a persistent current, whereas the Zeeman split of Fermi energy results in the spatial modulation of the pair potential. We show that these two magnetic fields stabilize the FFLO phase in a large parameter region of the magnetic fields. We further draw the phase diagram with the two kinds of first-order phase transitions; one corresponds to phase slips separating the Aharonov-Bohm magnetic flux, and the other separates the number of peaks of the pair amplitude for the Zeeman magnetic field.