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arXiv 1807.09803hep-thcond-mat.mes-hall
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电场和磁场交叉作用下Dirac方程的非对易性效应

Non-Commutativity effects in the Dirac equation in crossed electric and magnetic fields

D. Nath, M. Presilla, O. Panella, P. Roy

摘要:

本文给出了在电场和磁场相互作用下非对易平面上Dirac方程的精确解。在标准对易平面中,当电场接近临界值时,这种系统会表现出朗道能级的收缩。在这种情况下,我们找到了精确的解决方案的非交换参数$η$(动量非交换性)和$θ$(坐标非交换性),并提供了明确的表达朗道水平。我们表明,非交换性保持崩溃的频谱。我们提供了系统的双重描述:(i)一个是在给定的电场的磁场是变化的,另一个是在给定的磁场的电场是变化的。在前一种情况下,我们发现,动量非对易性($η$)分裂的临界磁场成两个临界场,而坐标非对易性($θ$)产生两个额外的临界点,根本不存在于交换的情况下。

英文摘要:

In this paper we present exact solutions of the Dirac equation on the non-commutative plane in the presence of crossed electric and magnetic fields. In the standard commutative plane such a system is known to exhibit contraction of Landau levels when the electric field approaches a critical value. In the present case we find exact solutions in terms of the non-commutative parameters $η$ (momentum non-commutativity) and $θ$ (coordinate non-commutativity) and provide an explicit expression for the Landau levels. We show that non-commutativity preserves the collapse of the spectrum. We provide a dual description of the system: (i) one in which at a given electric field the magnetic field is varied and the other (ii) in which at a given magnetic field the electric field is varied. In the former case we find that momentum non-commutativity ($η$) splits the critical magnetic field into two critical fields while coordinates non-commutativity ($θ$) gives rise to two additional critical points not at all present in the commutative scenario.

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