Spin-orbital magnetic response of relativistic fermions with band hybridization
Spin-orbital magnetic response of relativistic fermions with band hybridization
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DOI：
10.1103/physrevresearch.3.023098
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发表时间：
2020-11
期刊：
影响因子：
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通讯作者：
Y. Araki;Daiki Suenaga;Kei Suzuki;S. Yasui
中科院分区：
文献类型：
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作者：
Y. Araki;Daiki Suenaga;Kei Suzuki;S. Yasui
相对论性费米子的自旋与其轨道自由度有关。为了定量研究由相对论性和非相对论性费米子组成的系统中的相对论效应，我们着重研究了自旋轨道交叉极化率，它在自旋轨道耦合的存在下变得有限. SO交叉磁化率定义为它们的自旋极化对“轨道”磁场的响应函数，即磁场对粒子轨道运动的影响作为矢势。一旦相对论性和非相对论性费米子杂化，它们的SO交叉磁化率在带杂化点附近的费米能量处得到修改，导致非相对论性费米子的自旋极化。这些影响下的动态磁场，违反热平衡，所产生的带间过程允许的带杂交增强。它的实验实现讨论了狄拉克电子在固体中的晶体对称性的轻微破坏或掺杂，也为夸克物质，包括稀释重夸克与轻夸克强烈杂交，在相对论重离子碰撞过程中产生的。
Spins of relativistic fermions are related to their orbital degrees of freedom. In order to quantify the relativistic effect in systems composed of both relativistic and nonrelativistic fermions, we focus on the spin-orbital (SO) crossed susceptibility, which becomes finite in the presence of spin-orbit coupling. The SO crossed susceptibility is defined as the response function of their spin polarization to the "orbital" magnetic field, namely the effect of magnetic field on the orbital motion of particles as the vector potential. Once relativistic and nonrelativistic fermions are hybridized, their SO crossed susceptibility gets modified at the Fermi energy around the band hybridization point, leading to spin polarization of nonrelativistic fermions as well. These effects are enhanced under a dynamical magnetic field that violates thermal equilibrium, arising from the interband process permitted by the band hybridization. Its experimental realization is discussed for Dirac electrons in solids with slight breaking of crystalline symmetry or doping, and also for quark matter including dilute heavy quarks strongly hybridized with light quarks, arising in a relativistic heavy-ion collision process.