我们进行了系统的{ \it ab initio}研究的功函数和它的均匀应变依赖石墨烯和硅烯的拉伸和压缩应变。还计算了与扶手椅和锯齿形应变相关的泊松比。基于这些结果,我们得到的变形势,应变电子学的关键,作为施加的应变的函数。此外,我们提出了一个特殊的实验装置与一个特殊的应变配置,只产生电场,而伪磁场是缺席。然后,施加一个真实的磁场,人们应该能够在实验上实现石墨烯或相关二维材料中朗道能级崩溃的壮观现象。
英文摘要:
We perform a systematic {\it ab initio} study of the work function and its uniform strain dependence for graphene and silicene for both tensile and compressive strains. The Poisson ratios associated with armchair and zigzag strains are also computed. Based on these results, we obtain the deformation potential, crucial for straintronics, as a function of the applied strain. Further, we propose a particular experimental setup with a special strain configuration that generates only the electric field, while the pseudomagnetic field is absent. Then, applying a real magnetic field, one should be able to realize experimentally the spectacular phenomenon of the collapse of Landau levels in graphene or related two-dimensional materials.
Landau levels in curved space realized in strained graphene
Rudolf Peierls Centre for Theoretical Physics(鲁道夫·皮尔斯理论物理中心);Donostia International Physics Center(圣塞巴斯蒂安国际物理中心);IKERBASQUE, Basque Foundation for Science(伊克尔巴斯基克,巴斯克科学基金会);Brown Theoretical Physics Center and Department of Physics, Brown University(布朗大学布朗理论物理中心及物理系)
Interacting Majorana fermions in strained nodal superconductors
朗道能级(LL)已被预测出现在狄拉克节点下施加非均匀应变的系统。本文研究了二维$d_{xy}$单线态(2D-S)和三维$p \pm i p$等自旋三线态(3D-T)超导体。我们证明了spinful马约拉纳性质的散装无间隙零-LLS。沿一定方向的应变可以在体相中诱导两个拓扑结构不同的相,第零个LLs位于界面处。这些模式是不稳定的铁磁性的2D-S的情况下。3D-T中出现的实空间马约拉纳费米子允许更多奇异的可能性。
Modeling strained Cd$_3$As$_2$ thin films and their behavior in magnetic fields
Argonne National Laboratory(阿贡国家实验室);University of Waterloo(滑铁卢大学);Perimeter Institute for Theoretical Physics(基础物理珀米特研究所);Ames National Laboratory(艾姆斯国家实验室);Saarland University(萨尔兰大学);Center for Quantum Technologies (QuTe), Saarland University(萨尔兰大学量子技术中心);São Carlos Institute of Physics, University of São Paulo(圣保罗大学卡尔莫斯物理研究所)
Distinguishing Mott and strain-induced anisotropic semimetals in magic-angle twisted bilayer graphene using Landau level spectroscopy
National High Magnetic Field Laboratory(国家强磁场实验室);Florida State University(佛罗里达州立大学);Princeton University(普林斯顿大学);Weizmann Institute of Science(魏茨曼科学研究所);University of California Santa Barbara(加州大学圣塔芭芭拉分校);Donostia International Physics Center(圣塞巴斯蒂安国际物理中心);IKERBASQUE, Basque Foundation for Science(伊克尔巴斯基克,巴斯克科学基金会);University of Minnesota(明尼苏达大学)