人工高温超晶格中Fano-Feshbach形状共振导致的超导圆顶
Superconducting dome due to the Fano-Feshbach shape resonance in artificial high-Tc superlattices
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中文总结 AI 辅助
本研究通过分子束外延制备人工高温超晶格，利用量子几何因子调节Fano-Feshbach形状共振，系统研究超导圆顶全掺杂范围的磁输运特性，验证了BPV理论。
中文摘要 AI 辅助
本研究对Bianconi-Perali-Valletta（BPV）理论提供了有力的实验验证，该理论基于人工高温超晶格（AHTS）的量子材料设计预测了超导圆顶，AHTS由选定的纳米级异质结构几何构成。这些AHTS是周期为d的SNSN超晶格，由厚度为L的超导掺杂莫特绝缘体层（S，具有Rashba自旋轨道耦合）和插入其间的正常金属间隔层（N）组成，通过分子束外延（MBE）生长。在这些超晶格中，通过量子几何因子L/d改变化学势，可调节BCS态超导能隙与BEC-BCS渡越区不同能隙间对转移过程中的Fano-Feshbach形状共振，从而获得实验观测到的超导圆顶。本研究对AHTS人工超晶格在超导圆顶的整个掺杂范围（从极欠掺杂到过掺杂）开展了系统的磁输运研究，使用高达72 T的脉冲磁场，通过改变L/d比率，调节有效空穴浓度Δ=0.45(1-L/d)，并绘制了电阻转变、上临界磁场及金兹堡-朗道相干长度的演化图。
英文摘要
In this work we provide compelling experimental validation of the Bianconi Perali Valletta (BPV) theory predicting a superconducting dome based on a quantum material design of Artificial High TC Superlattices (AHTS) made with a selected nanoscale heterostructure geometry. These AHTS are SNSN superlattices of quantum wells of period d, composed of first units, superconducting doped Mott insulator layers with Rashba spin orbit coupling (S) of thickness L, intercalated by second units, normal metal spacers (N). In these superlattices, grown by molecular beam epitaxy (MBE), the experimental superconducting dome is obtained by material quantum design changing the chemical potential via the quantum geometrical factor L/d which tunes the Fano-Feshbach shape resonance in the pair transfer between superconducting gaps in the BCS regime and different gaps in the BEC-BCS crossover. Here we present a systematic magneto-transport study of AHTS artificial superlattices across the full doping range of the superconducting dome, from the deeply underdoped to the overdoped regime, using pulsed magnetic fields up to 72 T. By varying the L/d ratio, we tune the effective hole concentration delta=0.45(1-L/d) and map the evolution of the resistive transitions, the upper critical magnetic field and the Ginzburg-Landau coherence length
