Kotel'nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Fryazino, Moscow District, 141190, Russia.
J Phys Condens Matter. 2011 May 4;23(17):175601. doi: 10.1088/0953-8984/23/17/175601. Epub 2011 Apr 8.
We have studied singlet-triplet transitions (STTs) in a system of two interacting electrons in a one-dimensional quantum dot in the presence of the spin-orbit interaction (SOI) and a magnetic field. The STTs are shown to occur owing only to a combined action of the SOI and magnetic field. The energy gap at the STT point depends on the relative direction of the external magnetic field and an effective magnetic field of the SOI. An interesting effect is produced by the electron-electron interaction that can be controlled by nearby gates. The increase of the interaction strength results in the significant reduction of the critical magnetic field, under which the STT occurs, and lowering of the energy gap.
我们研究了在存在自旋轨道相互作用（SOI）和磁场的一维量子点中两个相互作用电子系统中的单重态-三重态跃迁（STTs）。结果表明，STTs 仅由于 SOI 和磁场的共同作用而发生。在 STT 点的能隙取决于外磁场和 SOI 的有效磁场的相对方向。电子-电子相互作用产生了一个有趣的效应，该效应可以通过附近的栅极进行控制。相互作用强度的增加导致发生 STT 的临界磁场显著降低，同时能隙降低。
