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首页> 外文会议>NATO Advanced Study Research Workshop on Symmetry and Heterogeneity in High Temperature Superconductors >FESHBACH SHAPE RESONANCES IN MULTIBAND HIGH T_C SUPERCONDUCTORS
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FESHBACH SHAPE RESONANCES IN MULTIBAND HIGH T_C SUPERCONDUCTORS

机译：多频带高T_C超导体中的Feshbach形状共振

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摘要

We describe particular nanoarchitectures (superlattices of superconducting wires and layers) where a mechanism to evade temperature decoherence effects in a quantum condensate is switched on by tuning the charge density. The superlattice structure determines the subbands and the corresponding Bloch wavefunctions of charge carriers at the Fermi level with different parity and different spatial locations. The disparity and negligible overlap between electron wave-functions in different subbands suppress the single electron interband impurity scattering rate and allow the multiband superconductivity in the clean limit. The quantum trick that bestows to the system the property to resist to the decoherence attacks of high temperature is the Feshbach shape resonance in the interband off-diagonal exchange-like pairing term i.e., in the quantum configuration interaction between pairing channels in different subbands. It occurs by tuning the chemical potential at a particular point near a Van Hove singularity (vHs) in the electronic energy spectrum, or a Lifshitz electronic topological transition (ETT), associated with the change of the dimensionality of the Fermi surface topology of one of the subbands.
机译：我们描述了特定的纳米建筑（超导线和层的超晶片），其中通过调谐电荷密度通过调节量子冷凝物中的温度脱机效果的机制接通。超晶格结构在具有不同奇偶校验和不同的空间位置确定FERMI水平的电荷载流子的子带和相应的布洛奇波发生器。不同子带中的电子波函数之间的视差和可忽略不计的重叠抑制了单个电子间杂质散射速率，并允许多频带超导电性在清洁极限中。赋予系统的量子特征来抵抗高温的变形攻击的属性是在不同子带中配对信道之间的量子配置交互中的Feshbach形状谐振。它通过在电子能谱中的van Hove奇点（VHS）附近的特定点处的化学电位或Lifshitz电子拓扑过渡（ETT）的特定点进行调整，与其中一个中的费米表面拓扑的维度的变化相关联子带。

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