Bogan A, Studenikin S A, Korkusinski M, Aers G C, Gaudreau L, Zawadzki P, Sachrajda A S, Tracy L A, Reno J L, Hargett T W
Emerging Technology Division, National Research Council, Ottawa, Canada K1A0R6.
Sandia National Laboratories, Albuquerque, New Mexico 87185, USA.
Phys Rev Lett. 2017 Apr 21;118(16):167701. doi: 10.1103/PhysRevLett.118.167701. Epub 2017 Apr 20.
Hole transport experiments were performed on a gated double quantum dot device defined in a p-GaAs/AlGaAs heterostructure with a single hole occupancy in each dot. The charging diagram of the device was mapped out using charge detection confirming that the single hole limit is reached. In that limit, a detailed study of the two-hole spin system was performed using high bias magnetotransport spectroscopy. In contrast to electron systems, the hole spin was found not to be conserved during interdot resonant tunneling. This allows one to fully map out the two-hole energy spectrum as a function of the magnitude and the direction of the external magnetic field. The heavy-hole g factor was extracted and shown to be strongly anisotropic, with a value of 1.45 for a perpendicular field and close to zero for an in-plane field as required for hybridizing schemes between spin and photonic quantum platforms.
在一个p-GaAs/AlGaAs异质结构中定义的栅控双量子点器件上进行了空穴输运实验，每个量子点中仅有一个空穴占据。利用电荷检测绘制出该器件的充电图，证实达到了单空穴极限。在该极限下，使用高偏置磁输运光谱对双空穴自旋系统进行了详细研究。与电子系统不同，发现空穴自旋在量子点间共振隧穿过程中不守恒。这使得人们能够完整地绘制出双空穴能谱作为外部磁场大小和方向的函数。提取了重空穴g因子，结果表明其具有很强的各向异性，垂直场下的值为1.45，面内场下接近零，这是自旋和光子量子平台之间杂交方案所要求的。
