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arXiv 1108.4384cond-mat.mes-hall
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2+1维Dirac费米子的半经典分析

A semi-classical analysis of Dirac fermions in 2+1 dimensions

Moitri Maiti, R. Shankar

摘要:

本文研究了2+1维空间中无质量狄拉克费米子在外电磁场作用下的半经典动力学。通过将$α$矩阵推广到自旋- $S$矩阵,并进行一定的缩放,我们制定了一个$S\rightarrow\infty$极限,其中自旋和轨道度成为经典的。我们求解了圆柱上自由粒子和恒定磁场中粒子的经典轨迹。我们比较了半经典光谱,通过玻尔索末菲量子化与精确的量子谱的低值。对于自由粒子,半经典谱是精确的。对于处于恒定磁场中的粒子,半经典谱再现了在所有$S$处精确量子谱的所有定性特征。$S=1/2$的定量拟合相当好。

英文摘要:

We investigate the semiclassical dynamics of massless Dirac fermions in 2+1 dimensions in the presence of external electromagnetic fields. By generalizing the $α$ matrices to the spin-$S$ matrices and doing a certain scaling, we formulate a $S\rightarrow\infty$ limit where the spin and the orbital degrees become classical. We solve for the classical trajectories for a free particle on a cylinder and a particle in a constant magnetic field. We compare the semiclassical spectrum, obtained by Bohr-Sommerfeld quantization with the exact quantum spectrum for low values of. For the free particle, the semiclassical spectrum is exact. For the particle in a constant magnetic field, the semiclassical spectrum reproduces all the qualitative features of the exact quantum spectrum at all $S$. The quantitative fit for $S=1/2$ is reasonably good.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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