准二维过渡金属二硫属化物（TMD）具有显著的性质，可以改变电子和光子器件。我们报告了如何在MoTe $_2$，一种II型Weyl半金属，在高磁场下观察到的巨大的磁电阻（MR），可以在拉伸应变下可逆地控制。当沿$a$晶体学方向施加单轴应变时，在低温和高磁场下，MR增强多达~ 30%，并且当沿$b$方向施加应变时，MR减小大约相同的量。我们表明，大的面内电各向异性耦合的结构转变，从1 T '单斜的Td正交Weyl相。通过最小的拉伸应变实现Td -1 T '相界的移动。MR对拉伸应变的敏感性表明在Weyl点附近的电子和空穴袋的非平凡的自旋轨道纹理的可能性。我们的从头计算确实显示了一个显着的费米面上的轨道混合，这是修改的拉伸应变。
英文摘要：
Quasi-two dimensional transition metal dichalcogenides (TMD) exhibit dramatic properties that may transform electronic and photonic devices. We report on how the anomalously large magnetoresistance (MR) observed under high magnetic field in MoTe$_2$, a type II Weyl semimetal, can be reversibly controlled under tensile strain. The MR is enhanced by as much as ~ 30 % at low temperatures and high magnetic fields, when uniaxial strain is applied along the $a$-crystallographic direction and reduced by about the same amount when strain is applied along the $b$-direction. We show that the large in-plane electric anisotropy is coupled with the structural transition from the 1T' monoclinic to the Td orthorhombic Weyl phase. A shift of the Td - 1T' phase boundary is achieved by minimal tensile strain. The sensitivity of the MR to tensile strain suggests the possibility of a nontrivial spin-orbital texture of the electron and hole pockets in the vicinity of Weyl points. Our ab initio calculations indeed show a significant orbital mixing on the Fermi surface, which is modified by the tensile strains.
Quantum Oscillations and Magnetoresistance in Type-II Weyl Semimetals - Effect of a Field Induced Charge Density Wave
最近的实验表明，在强磁场作用下，第二类Weyl半金属如WTe $_2$、MoTe $_2$、Mo $_x$ W $_{1-x}$ Te $_2$和WP $_2$具有显著的输运性质，包括极大的磁电阻和不寻常的温度依赖性。在这里，我们调查磁输运通过Kubo公式在一个极小模型的II型Weyl半金属考虑到电荷密度波（CDW）过渡的影响，这可能会出现，即使在弱耦合在一个强磁场的存在下，因为特殊的朗道级色散的II型Weyl系统。与实验测量一致，我们发现一个非常大的磁阻接近$B^2$缩放在粒子空穴补偿，而在极端的量子极限有一个过渡到一个定性的新的缩放约$B^{0.75}$。我们还研究了Shubnikov-de Haas效应，发现在CDW转变温度以下，电阻率量子振荡的幅度大大增强，这伴随着不寻常的非单调（非Lifshitz-Kosevich）温度依赖性。
General Green's function formalism for transport calculations with spd-Hamiltonians and giant magnetoresistance in Co and Ni based magnetic multilayers
First-Principles Study of I$_2$ and CH$_3$I Adsorption on Transition Metal Decorated 2D-Material substrates : Insights from Electronic Structure and Reaction Kinetics
Indira Gandhi Centre for Atomic Research（印度原子能研究中心）
Resonant diffraction and photoemission inconsistent with altermagnetism in epitaxial RuO$_2$ films
Cornell University（康奈尔大学）；The Ohio State University（俄亥俄州立大学）；Argonne National Laboratory（阿贡国家实验室）；Brookhaven National Laboratory（布鲁克海文国家实验室）；Williams College（威廉姆斯学院）；Max-Planck Institute for Chemical Physics of Solids（马克斯·普朗克固体化学物理研究所）；Kavli Institute at Cornell for Nanoscale Science（康奈尔卡弗里纳米科学研究所）；Leibniz-Institut für Kristallzüchtung（莱布尼茨晶体生长研究所）
Ab initio Prediction of Mechanical, Electronic, Magnetic and Transport Properties of Bulk and Heterostructure of a Novel Fe-Cr based Full Heusler Chalcogenide
