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arXiv 1408.6502cond-mat.supr-concond-mat.mtrl-sci
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电子-电子相互作用对低掺杂二维半导体超导性的普遍增强

Universal enhancement of superconductivity in two dimensional semiconductors at low doping by electron-electron interaction

Matteo Calandra, Paolo Zoccante, Francesco Mauri

摘要:

在二维多通道半导体中,在低掺杂下,即使是适度的电子-电子相互作用也会增强对引起谷极化的任何扰动的响应。如果谷极化是由于电子-声子耦合,电子-电子相互作用导致超导临界温度的提高。通过进行第一性原理计算超越密度泛函理论,我们证明了这种效应占非常规的掺杂依赖的超导转变温度(T $_c$)和磁化率测量锂$_x$ ZrNCl。通过寻找最大T $_c$增强的条件,我们展示了如何弱掺杂的二维半导体提供了一条通往高T $_c$超导性的途径。

英文摘要:

In two-dimensional multivalley semiconductors, at low doping, even a moderate electron-electron interaction enhances the response to any perturbation inducing a valley polarization. If the valley polarization is due to the electron-phonon coupling, the electron-electron interaction results in an enhancement of the superconducting critical temperature. By performing first principles calculations beyond density functional theory, we prove that this effect accounts for the unconventional doping-dependence of the superconducting transition-temperature (T$_c$) and of the magnetic susceptibility measured in Li$_x$ZrNCl. By finding the conditions for a maximal T$_c$ enhancement, we show how weakly-doped two-dimensional semiconductors provide a route towards high T$_c$ superconductivity.

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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