Superfluid-insulator transition and the BEC-BCS crossover in the Rashba moat band
Superfluid-insulator transition and the BEC-BCS crossover in the Rashba moat band
复制标题
DOI：
10.1103/physrevb.99.104505
复制
发表时间：
2018-03
影响因子：
3.7
通讯作者：
Hassan Allami;O. Starykh;D. Pesin
中科院分区：
文献类型：
--
作者：
Hassan Allami;O. Starykh;D. Pesin
研究了具有强Rashba自旋-轨道耦合的二维电子气体中的超导跃迁。我们假设低电子密度，这样只有大多数自旋带参与跃迁。我们表明，超导跃迁遵循玻色-爱因斯坦凝聚（BEC）或巴丁-库珀-施里弗（BCS）情景，这取决于相对于大多数能带底部的化学势的位置，以及电子之间的库仑排斥强度。因此，该系统中的bc - bcs交叉可以由化学势的变化或到栅极的距离驱动。
We study the superconducting transition in a two-dimensional electron gas with strong Rashba spin-orbit coupling. We assume low electron density, such that only the majority spin band participates in the transition. We show that the superconducting transition follows either the Bose-Einstein condensation (BEC), or the Bardeen-Cooper-Schrieffer (BCS) scenarios, depending on the position of the chemical potential with respect to the bottom of the majority band, and the strength of the Coulomb repulsion between electrons. Hence, the BEC-BCS crossover in this system can be driven either by the change in the chemical potential, or the distance to a gate.