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arXiv 0905.4285cond-mat.str-elcond-mat.stat-mech
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Smectons:电子条纹相的软模及其对热力学和输运的影响

Smectons: Soft modes in electronic stripe phases, and their consequences for thermodynamics and transport

T. R. Kirkpatrick, D. Belitz

摘要:

在电子系统中,由条形或单向电荷密度波序引起的Goldstone模与经典近晶相液晶中的Goldstone模具有相同的函数形式。这与螺旋磁序导致的Goldstone模非常相似。这使得一个有效的理论,提供了一个准粒子描述的条纹相或helimagnets在低能量制度。最显著的观测结果是d=2时的电子弛豫速率,在清洁体系中为1/τ~ T \ln T,在弱无序体系中为1/τ~ \sqrt{T}。d=3时的相应结果分别为1/τ~ T^{3/2}和1/τ~ T。

英文摘要:

The Goldstone mode due to stripe or unidirectional charge-density-wave order in electron systems is found to have the same functional form as the one in classical smectic liquid crystals. It is very similar to the Goldstone mode that results from helical magnetic order. This allows for an effective theory that provides a quasiparticle description of either stripe phases or helimagnets in the low-energy regime. The most remarkable observable consequence is an electronic relaxation rate in d=2 that is 1/τ~ T\ln T in clean systems and 1/τ~ \sqrt{T} in weakly disordered ones. The corresponding results in d=3 are 1/τ~ T^{3/2} and 1/τ~ T, respectively.

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