School of Electrical, Computer, and Energy Engineering, Arizona State University, Tempe, Arizona 85287-5706, USA.
School of Physical Science and Technology, and Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University, Lanzhou, Gansu 730000, China.
Phys Rev Lett. 2018 Mar 23;120(12):124101. doi: 10.1103/PhysRevLett.120.124101.
We uncover a remarkable quantum scattering phenomenon in two-dimensional Dirac material systems where the manifestations of both classically integrable and chaotic dynamics emerge simultaneously and are electrically controllable. The distinct relativistic quantum fingerprints associated with different electron spin states are due to a physical mechanism analogous to a chiroptical effect in the presence of degeneracy breaking. The phenomenon mimics a chimera state in classical complex dynamical systems but here in a relativistic quantum setting-henceforth the term "Dirac quantum chimera," associated with which are physical phenomena with potentially significant applications such as enhancement of spin polarization, unusual coexisting quasibound states for distinct spin configurations, and spin selective caustics. Experimental observations of these phenomena are possible through, e.g., optical realizations of ballistic Dirac fermion systems.
我们在二维狄拉克材料系统中发现了一种显著的量子散射现象，其中经典可积和混沌动力学的表现同时出现且可通过电学控制。与不同电子自旋态相关的独特相对论量子特征归因于一种物理机制，类似于简并破缺时的手性光学效应。该现象模拟了经典复杂动力系统中的嵌合体状态，但这里是在相对论量子环境中——因此称之为“狄拉克量子嵌合体”，与之相关的是具有潜在重要应用的物理现象，例如自旋极化增强、不同自旋构型共存的异常准束缚态以及自旋选择性焦散线。通过例如弹道狄拉克费米子系统的光学实现，可以观察到这些现象。
