论文标题
用拉曼辅助自旋轨道耦合在超低费米气体中模拟和检测Weyl Fermions
Simulation and detection of Weyl fermions in ultracold Fermi gases with Raman-assisted spin-orbit coupling
论文作者
论文摘要
Weyl fermion，也称为动量空间中的伪磁单极，是一种未发现的无质量基本粒子，根据相对论量子场理论预测了半含量的旋转。由最近在超低bose气体中与拉曼辅助的3D自旋轨耦合的Weyl半分条带的实验观察到的动机，我们研究了超能量超速Fermi气体的低能量准准抛光激发中的Weyl Fermions的性质和可能观察。遵循先前的建议，即现有的拉曼晶格方案可以很容易地将其推广到费米子系统，在这里我们讨论了布里远区域中的韦伊尔点的运动，以及通过调整有效的Zeeman领域的创建和灭绝Weyl Fermions的创造和an灭。还通过计算Chern数来证明相关的拓扑特性。此外，我们提出了如何通过密度分布测量值实验验证Weyl Fermions的存在以及相关的量子相变。
Weyl fermion, also referred to as pseudo-magnetic monopole in momentum space, is an undiscovered massless elementary particle with half-integer spin predicted according to relativistic quantum field theory. Motivated by the recent experimental observation of Weyl semimetal band in ultracold Bose gases with Raman-assisted 3D spin-orbit coupling, we investigate the properties and possible observation of Weyl fermions in the low-energy quasi-particle excitations of ultracold Fermi gases. Following a previous suggestion that the existing Raman lattice scheme can be readily generalized to fermionic systems, here we discuss the movement of the Weyl points in the Brillouin Zone, as well as the creation and annihilation of Weyl fermions by adjusting the effective Zeeman field. The relevant topological properties are also demonstrated by calculating the Chern number. Furthermore, we propose how to experimentally verify the existence of the Weyl fermions and the associated quantum phase transition via density profile measurements.
