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arXiv 0708.2415cond-mat.str-elcond-mat.dis-nn
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二维金属-绝缘体相变的时效效应

Aging Effects Across the Metal-Insulator Transition in Two Dimensions

J. Jaroszynski, Dragana Popovic

摘要:

本文研究了Si中二维电子系统电导弛豫的时效效应与载流子密度的关系。它们揭示了在金属-绝缘体转变(MIT)时玻璃相的性质的突然变化:(a)在绝缘状态下观察到完全老化,而在较高密度$n_g$下玻璃相完全消失之前,MIT的金属侧与完全老化有显著的偏离;(b)弛豫峰的幅度正好低于MIT,并且在绝缘相中被强烈抑制。老化的其他方面,包括大的非高斯噪声和类似的自旋玻璃,也进行了讨论。

英文摘要:

Aging effects in the relaxations of conductivity of a two-dimensional electron system in Si have been studied as a function of carrier density. They reveal an abrupt change in the nature of the glassy phase at the metal-insulator transition (MIT): (a) while full aging is observed in the insulating regime, there are significant departures from full aging on the metallic side of the MIT, before the glassy phase disappears completely at a higher density $n_g$; (b) the amplitude of the relaxations peaks just below the MIT, and it is strongly suppressed in the insulating phase. Other aspects of aging, including large non-Gaussian noise and similarities to spin glasses, also have been discussed.

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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