用量子设计在Fano–Feshbach共振下调谐的人造高Tc超晶格中的超导圆顶

IF 1.9 Q3 PHYSICS, CONDENSED MATTER
G. Logvenov, Nicolas Bonmassar, G. Christiani, G. Campi, A. Valletta, Antonio Bianconi
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引用次数: 0

摘要

几十年来,寻找新的高温超导体一直是由经验的“试验和错误”方法驱动的,而我们现在报告了在纳米尺度上由量子力学理论设计的人工高tc超晶格(AHTS)的合成。这一发现为设计一种新型高温超导体铺平了道路,此前,Mazziotti等人最近在2022年实施了Bianconi Perali Valletta (BPV)理论的预测,包括Rashba自旋轨道耦合,以创建由量子阱组成的纳米级AHTS。这些超晶格内的高tc超导性能由超晶格几何结构参数控制,特别是代表La2CuO4层厚度(L)相对于超晶格周期(d)的比率L/d。利用分子束外延,我们成功地生长了许多AHTS样品。这些样品由厚度为L的化学计量La2CuO4单元的初始层组成,通过界面空间电荷掺杂,并插入第二层非超导金属材料。La1.55Sr0.45CuO4与厚度表示W = d−L .这个配置形成量子超晶格周期性d。实验依赖之间的协议观察Tc(超导转变温度)与L / d比率和出去的BPV理论的预测超导圆顶的形式验证的假说超导圆顶起源于Fano-Feshbach或形状共振多隙超导量子纳米级驱动监禁。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Superconducting Dome in Artificial High-Tc Superlattices Tuned at the Fano–Feshbach Resonance by Quantum Design
While the search for new high-temperature superconductors had been driven by the empirical “trials and errors” method for decades, we now report the synthesis of Artificial High-Tc Superlattices (AHTS) designed by quantum mechanics theory at the nanoscale. This discovery paves the way for engineering a new class of high-temperature superconductors, following the predictions of the Bianconi Perali Valletta (BPV) theory recently implemented in 2022 by Mazziotti et al. including Rashba spin-orbit coupling to create nanoscale AHTS composed of quantum wells. The high-Tc superconducting properties within these superlattices are controlled by a conformational parameter of the superlattice geometry, specifically, the ratio L/d which represents the thickness of La2CuO4 layers (L) relative to the superlattice period (d). Using molecular beam epitaxy, we have successfully grown numerous AHTS samples. These samples consist of initial layers of stoichiometric La2CuO4 units with a thickness L, doped by interface space charge, and intercalated with second layers of non-superconducting metallic material, La1.55Sr0.45CuO4 with thickness denoted as W = d − L. This configuration forms a quantum superlattice with periodicity d. The agreement observed between the experimental dependence Tc (the superconducting transition temperature) versus L/d ratio and the predictions of the BPV theory for AHTS in the form of the superconducting dome validates the hypothesis that the superconducting dome arises from the Fano–Feshbach or shape resonance in multigap superconductivity driven by quantum nanoscale confinement.
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来源期刊
Condensed Matter
Condensed Matter PHYSICS, CONDENSED MATTER-
CiteScore
2.90
自引率
11.80%
发文量
58
审稿时长
10 weeks
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