Institute of Science and Technology Austria , Am Campus 1, 3400 Klosterneuburg, Austria.
Institute of Semiconductor and Solid State Physics, Johannes Kepler University , Altenbergerstrasse 69, 4040 Linz, Austria.
Nano Lett. 2016 Nov 9;16(11):6879-6885. doi: 10.1021/acs.nanolett.6b02715. Epub 2016 Oct 17.
Hole spins have gained considerable interest in the past few years due to their potential for fast electrically controlled qubits. Here, we study holes confined in Ge hut wires, a so-far unexplored type of nanostructure. Low-temperature magnetotransport measurements reveal a large anisotropy between the in-plane and out-of-plane g-factors of up to 18. Numerical simulations verify that this large anisotropy originates from a confined wave function of heavy-hole character. A light-hole admixture of less than 1% is estimated for the states of lowest energy, leading to a surprisingly large reduction of the out-of-plane g-factors compared with those for pure heavy holes. Given this tiny light-hole contribution, the spin lifetimes are expected to be very long, even in isotopically nonpurified samples.
近年来，由于其在快速电控制量子比特方面的潜力，孔旋转引起了相当大的关注。在这里，我们研究了限制在 Ge 小屋线中的孔，这是一种迄今为止尚未探索过的纳米结构类型。低温磁输运测量显示出高达 18 的面内和面外 g 因子之间的大各向异性。数值模拟验证了这种大各向异性源于重空穴特征的受限波函数。对于最低能量的状态，估计轻空穴的混合量小于 1%，这导致与纯重空穴相比，面外 g 因子的惊人减小。鉴于这种微小的轻空穴贡献，自旋寿命预计会很长，即使在非同位素纯化的样品中也是如此。
