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引用次数: 0
摘要
外部应变可产生与外部外加磁场类似的效果。这种伪磁场可能比典型磁场更大,这就为实验研究朗道水平提供了机会。在本文中,我们使用连续和晶格模型研究了单轴应变对 Weyl 节点的影响。在连续模型中,我们发现单轴应变会导致磁场重正化,这实际上对应于朗道水平向更高能量的移动。我们还利用晶格模型研究了 I 型和 II 型 Weyl 节点。在这种情况下,磁场是通过皮埃尔斯置换引入的,而单轴应变则是通过跳变积分的方向依赖性引入的。这使我们能够探测朗道水平和霍夫斯塔特蝴蝶形式的系统谱。我们发现磁场的重正化现象与连续模型中观察到的现象相似。
Landau levels in Weyl semimetal under uniaxial strain
The external strain can lead to the similar effect to the external applied magnetic field. Such pseudo magnetic field can be larger than typical magnetic fields, which gives the opportunity to experimentally study the Landau levels. In this paper we study the effects of uniaxial strain on the Weyl nodes, using continuum and lattice model. In the continuum model we show that the uniaxial strain leads to magnetic field renormalization, which in practice corresponds to the shift of the Landau levels to higher energy. We also investigate type-I and type-II Weyl nodes using lattice model. In this case, the magnetic field is introduced by the Pierels substitution, while uniaxial strain by the direction dependence of hopping integrals. This allowed us to probe the Landau level and system spectrum which takes form of Hofstadter butterfly. We show that the renormalization of magnetic field, similar to this observed in the continuum model, emerges.
期刊介绍:
Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work.
Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas:
-Magnetism
-Materials physics
-Nanostructures and nanomaterials
-Optics and optical materials
-Quantum materials
-Semiconductors
-Strongly correlated systems
-Superconductivity
-Surfaces and interfaces