Control of nuclear spin system and its phase via quantum Hall electron systems

利用边态电子与核自旋的超精细相互作用，阐明了量子Hall边沟道中的电子自旋本征态以及量子Hall系统中核自旋极化的动力学.阐明了量子点接触和量子点系统中电子相干效应的特殊性。实验上揭示了量子霍尔电子系统中存在负微分电导以及量子霍尔态的电流诱导击穿中存在热双稳态。

Electron-spin eigenstates in quantum Hall edge channels as well as the dynamics of nuclear spin polarization in quantum Hall systems have been clarified by using hyperfine interaction between edge state electrons and nuclear spins. Specific features of electron coherence effects in the systems of quantum point contacts and quantum dots have been clarified. Occurrence of negative differential conductivity in quantum Hall electron systems as well as the existence of thermal bistability in the current-induced breakdown of the quantum Hall states have been experimentally revealed.