Katsaros Georgios, Kukučka Josip, Vukušić Lada, Watzinger Hannes, Gao Fei, Wang Ting, Zhang Jian-Jun, Held Karsten
Institute of Science and Technology Austria, Am Campus 1, 3400 Klosterneuburg, Austria.
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China.
Nano Lett. 2020 Jul 8;20(7):5201-5206. doi: 10.1021/acs.nanolett.0c01466. Epub 2020 Jun 11.
Using inelastic cotunneling spectroscopy we observe a zero field splitting within the spin triplet manifold of Ge hut wire quantum dots. The states with spin ±1 in the confinement direction are energetically favored by up to 55 μeV compared to the spin 0 triplet state because of the strong spin-orbit coupling. The reported effect should be observable in a broad class of strongly confined hole quantum-dot systems and might need to be considered when operating hole spin qubits.
利用非弹性共隧穿光谱，我们观测到锗量子线量子点的自旋三重态流形内的零场分裂。由于强自旋 - 轨道耦合，在限制方向上自旋为±1的态比自旋为0的三重态在能量上高出多达55微电子伏特。报道的这一效应在一大类强限制空穴量子点系统中应该是可观测的，并且在操作空穴自旋量子比特时可能需要加以考虑。
