Increasing demand for computational power has initiated the hunt for energy efficient and stable memory devices. This is the overarching motivation behind the recent rise of \textit{orbitronics}, which looks to harness the orbital angular momentum of charge carriers in computing devices. Orbitronic devices require materials with efficient generation of orbital angular momentum (OAM). In 2D materials, OAM can be electrically generated via the orbital magneto-electric effect (OME). In this paper we report the calculation of the OME in 2 dimensional hole gases (2DHGs). We show that the OME in Ge holes is very large, for an applied electric field of the order $10^4$ V$/$m the OAM density is of the order $10^{12}$ $\hbar/$cm$^{2}$. Furthermore, we find the OME to be an order of magnitude larger than the Rashba-Edelstein effect in 2DHGs. The OME we calculated in 2DHGs generates OAM aligned in the plane and arises due to transitions between heavy and light hole states, which is unique to this system. Our results put Ge, as well as other p-type semiconductors, forward as strong candidates for building future orbitronic devices.
Giant Intrinsic Spin and Orbital Hall Effects in Sr2MO4 (M=Ru,Rh,Mo)
通过研究金属d电子体系中Sr 2 MO 4（M=Ru，Rh，Mo）的t_{2g}轨道紧束缚模型，研究了金属d电子体系的本征自旋霍尔电导（SHC）和d轨道霍尔电导（OHC）.所得到的电导率比空穴掺杂5%的p型半导体的预测值大一到两个数量级。这些巨大的霍尔效应的起源是"有效Aharonov-Bohm相位“，这是由d原子角动量与自旋轨道相互作用和轨道间跳跃积分引起的。这种机制产生的巨大的SHC和OHC有望普遍存在于多轨道过渡金属配合物中，这为实现自旋电子学和轨道电子学器件提供了可能性。
Giant anisotropic magnetoresistance and planar Hall effect in the Dirac semimetal Cd3As2
各向异性磁电阻是指材料的电阻随电流和外磁场相互方向的变化趋势。在这里，我们报告的实验观察狄拉克半金属Cd 3 As 2的巨各向异性磁电阻及其横向版本，称为平面霍尔效应。相对各向异性磁电阻为负，在2K和10 T下可达-68%。在这种各向同性和双折射材料中的高各向异性和负号归因于沿磁场的场依赖电流，其可以由能带结构的Berry曲率引起。这一观测不仅揭示了外尔和狄拉克半金属中的异常物理现象，而且发现了外尔和狄拉克费米子除了负磁阻之外的其他输运特征。
Probing quantum geometric nonlinear magnetization via second-harmonic magneto-optical Kerr effect
Institute of Semiconductors, Chinese Academy of Sciences（中国科学院半导体研究所）；University of Chinese Academy of Sciences（中国科学院大学）；Southern University of Science and Technology (SUSTech)（南方科技大学）
Exchange coupling and current-perpendicular-to-plane giant magneto-resistance of magnetic trilayers. Rigorous results within a tight-binding single-band model
Magnetoelastic Transport-Path Reconstruction and Giant Magnetotransport Responses in a Two-Dimensional Antiferromagnet
Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences（中国科学院合肥物质科学研究院固体物理研究所材料物理重点实验室）；University of Science and Technology of China（中国科学技术大学）；School of Physics, University of Electronic Science and Technology of China（电子科技大学物理学院）；Anhui Key Laboratory of Low-Energy Quantum Materials and Devices, High Magnetic Field Laboratory, HFIPS, Chinese Academy of Sciences（中国科学院合肥物质科学研究院高磁场科学中心安徽省低能量子材料与器件重点实验室）；Collaborative Innovation Center of Microstructures, Nanjing University（南京大学微观结构协同创新中心）；Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska（内布拉斯加大学物理与天文学系及内布拉斯加材料与纳米科学中心）；State Key Laboratory of Semiconductor Physics and Chip Technologies, Institute of Semiconductors, Chinese Academy of Sciences（中国科学院半导体研究所半导体物理与芯片技术国家重点实验室）；Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences（中国科学院大学材料科学与光电工程学院）
Pyroelectric Control of Spin Polarization Assisted Coexistence of Giant Positive and Negative Magnetocaloric Effects
磁的电场控制是许多下一代自旋电子学应用的关键。铁电控制自旋极化2，3，随后在没有施加磁场的情况下电驱动可重复磁化反转4已被证明是该方向的里程碑。这篇文章提出了如何利用这些现象可以在一个相反的方式获得控制磁化，即使在没有电场。反过来，当受到不同的外加磁场作用时，三层结构的PbZr0.53Ti0.47O3-CoFe 2 O 4-PbZr0.53Ti0.47O3（PZT/CFO/PZT）纳米结构在相同的温度范围内同时表现出正磁热效应和负磁热效应.与传统的方法5 -9不同，本研究表明，仅通过磁热电耦合就可以获得巨型MCE。因此，发现使用麦克斯韦方程组计算的MCE熵变与现有巨型MCE值的报告一样大6，9，10。
Dirac-like fermions anomalous magneto-transport in a spin-polarized oxide two-dimensional electron system
CNR-SPIN（意大利国家研究委员会自旋物理研究所）；Department of Physics, University of Naples Federico II（那不勒斯费德里科二世大学物理系）；Department of Physics, Universitá degli studi di Salerno（萨莱诺大学物理系）；Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 CNRS and Université de Strasbourg（斯特拉斯堡材料物理与化学研究所）
