报告人: 黄兵教授 北京计算科学研究中心青年千人
报告题目: Generate and Transport Spin Current in Low-dimensional Quantum Materials
报告摘要: In the first part, we have developed a universal principle to generate and control a non-zero spin current in a quantum spin hall system by bending strain engineering. Here we show that bending strain can be used to control the spin orientation of counter-propagating edge states of a quantum spin system to generate a non-zero spin current. This physics mechanism can be applied to effectively tune the spin current and pure spin current decoupled from charge current in a quantum spin hall system by control of its bending curvature. In the second part, we demonstrate a novel mechanism for designing homogenous and long-range magnetism in the sp-electron molecular crystals instead of conventional atomic crystals. Molecular orbitals having different orbital energies and sequences are designed to have artificial frontier orbitals with large angular momenta (e.g. d and f) in a given crystal field to exhibit exotic quantum features, including magnetism.