对Condensed Matter的扭转效应：类似于磁场，但不太明显
Torsion effects on Condensed Matter: like a magnetic field but not so much
摘要：
在这项工作中，我们研究了由于均匀分布的拓扑缺陷（螺旋位错）的扭转弹性固体中的自由自旋/载流子动力学的影响。当粒子在这样的介质中运动时，与缺陷分布相关联的扭转的效果类似于施加磁场的效果，但具有细微的差异。在这个系统中存在朗道能级，但它们不能局限于二维。在无自旋载流子的情况下，零模式，这不会出现在磁朗道能级，出现的线性动量的量子化值投影在缺陷轴上。具有自旋的粒子受到自旋和扭转之间的塞曼耦合，这对电荷不敏感。这表明了在没有磁场的情况下，对带电载流子或不带电荷的准粒子（例如三重态激子）进行自旋共振实验的可能性。
英文摘要：
In this work, we study the effects of torsion due to a uniform distribution of topological defects (screw dislocations) on free spin/carrier dynamics in elastic solids. When a particle moves in such a medium, the effect of the torsion associated to the defect distribution is analogous to that of an applied magnetic field but with subtle differences. Analogue Landau levels are present in this system but they cannot be confined to two dimensions. In the case of spinless carriers, zero modes, which do not appear in the magnetic Landau levels, show up for quantized values of the linear momentum projected on the defects axis. Particles with spin are subjected to a Zeeman-like coupling between spin and torsion, which is insensitive to charge. This suggests the possibility of spin resonance experiments without a magnetic field for charged carriers or quasiparticles without electrical charge, like triplet excitons, for instance.
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