论文标题
分层晶体BCS超导体中静电场的影响
Impact of electrostatic fields in layered crystalline BCS superconductors
论文作者
论文摘要
最近通过应用强静电场抑制超导DAYEM桥的临界电流的迫使，在这项工作中，我们研究了对电荷重新分布的超导差距的影响，以响应薄晶体金属中的施加电场。通过数值以完全自洽的方式求解BCS间隙方程和泊松方程，我们发现，通过降低配对强度，我们观察到间隙在应用场上的灵敏度的提高，显示出突然上升和跌落，与状态局部局部密度兼容。通过增加对弱至中度耦合极限的配对强度或在状态密度中引入弱涂抹，从而显示出效果的效果，从而显示了从干净的晶体到弱无序金属的演变。
Motivated by recent experiments reporting the suppression of the critical current in superconducting Dayem bridges by the application of strong electrostatic fields, in this work we study the impact on the superconducting gap of charge redistribution in response to an applied electric field in thin crystalline metals. By numerically solving the BCS gap equation and the Poisson equation in a fully self-consistent way, we find that by reducing the pairing strength we observe an increased sensitivity of the gap on the applied field, showing sudden rises and falls that are compatible with surface modifications of the local density of states. The effect is washed out by increasing the pairing strength towards the weak-to-moderate coupling limit or by introduction of a weak smearing in the density of states, showing the evolution from a clean crystal to a weakly disordered metal.
