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arXiv 0903.2591cond-mat.dis-nncond-mat.mes-hallhep-th
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任意通道数手征幺正对称类无序量子线的超自旋方法

The superspin approach to a disordered quantum wire in the chiral-unitary symmetry class with an arbitrary number of channels

Andreas P. Schnyder, Christopher Mudry, Ilya A. Gruzberg

摘要:

利用定义在无限维Fock空间上的具有正定标积的超自旋哈密顿量,研究了在弱淬火无序扰动下准一维量子线中非相互作用的无自旋准粒子的局域化和离域化.过去使用这种方法的作品都考虑了单链。在这里,我们扩展的形式主义对待准一维系统:一个量子线与任意数量的通道耦合随机跳跃振幅。的计算进行明确的情况下的手征准一维线与破缺的时间反演对称性(手征酉对称类)。通过将沿链的空间方向视为虚时间,无序的影响被编码在由单点超自旋(非厄米特)哈密顿量引起的时间演化中。我们得到了无限长量子线带中心附近的态密度。我们的结果与基于手征么正对称类的Dorokhov-Mello-Pereyra-Kumar方程的结果一致。

英文摘要:

We use a superspin Hamiltonian defined on an infinite-dimensional Fock space with positive definite scalar product to study localization and delocalization of noninteracting spinless quasiparticles in quasi-one-dimensional quantum wires perturbed by weak quenched disorder. Past works using this approach have considered a single chain. Here, we extend the formalism to treat a quasi-one-dimensional system: a quantum wire with an arbitrary number of channels coupled by random hopping amplitudes. The computations are carried out explicitly for the case of a chiral quasi-one-dimensional wire with broken time-reversal symmetry (chiral-unitary symmetry class). By treating the space direction along the chains as imaginary time, the effects of the disorder are encoded in the time evolution induced by a single site superspin (non-Hermitian) Hamiltonian. We obtain the density of states near the band center of an infinitely long quantum wire. Our results agree with those based on the Dorokhov-Mello-Pereyra-Kumar equation for the chiral-unitary symmetry class.

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