Capozza R, Giuliano D, Lucignano P, Tagliacozzo A
Dipartimento di Scienze Fisiche Università degli studi di Napoli Federico II, Napoli, Italy.
Phys Rev Lett. 2005 Nov 25;95(22):226803. doi: 10.1103/PhysRevLett.95.226803. Epub 2005 Nov 23.
We calculate the oscillations of the dc conductance across a mesoscopic ring, simultaneously tuned by applied magnetic and electric fields orthogonal to the ring. The oscillations depend on the Aharonov-Bohm flux and of the spin-orbit coupling. They result from mixing of the dynamical phase, including the Zeeman spin splitting, and of geometric phases. By changing the applied fields, the geometric phase contribution to the conductance oscillations can be tuned from the adiabatic (Berry) to the nonadiabatic (Ahronov-Anandan) regime. To model a realistic device, we also include nonzero backscattering at the connection between ring and contacts, and a random phase for electron wave function, accounting for dephasing effects.
我们计算了穿过介观环的直流电导的振荡，该振荡同时受到与环正交的外加磁场和电场的调节。这些振荡取决于阿哈罗诺夫 - 玻姆磁通以及自旋 - 轨道耦合。它们源于动态相位（包括塞曼自旋分裂）和几何相位的混合。通过改变外加场，可以将几何相位对电导振荡的贡献从绝热（贝里）区域调节到非绝热（阿哈罗诺夫 - 阿南丹）区域。为了模拟一个实际的器件，我们还考虑了环与接触点之间连接处的非零背散射以及电子波函数的随机相位，以考虑退相效应。
