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Condensed Matter > Superconductivity
Title: High-Angular-Momentum Topological Superconductivity in the Largest-Angle Twisted Homo-bilayer Systems
(Submitted on 5 Jan 2022 (v1), last revised 16 Jan 2022 (this version, v3))
Abstract: We study the largest-angle twisted homo-bilayer (LA-THB) systems, hosting Moir\'eless quasi-crystal (QC) structure. We propose to use these materials to generate high-angular-momentum (HAM) topological superconductivities (TSCs) protected by their QC symmetries absent on conventional crystalline materials. This proposal is based on our universal Ginzburg-Landau theory based analysis which yields the general conclusion that, when each $D_n$-symmetric ($n$ is even) monolayer hosts SC with pairing angular momentum $l\le \frac{n}{2}$, the interlayer Josephson coupling will induce SC with pairing angular momentum $L=l$ or $L=n-l$ in the LA-THB, determined by microscopic details. The latter one is just the HAM TSC if $l>0$. Based on our revised perturbational-band theory, we develop general microscopic framework to study the QC LA-THBs involving electron-electron interactions, adopting which we study three examples, i.e. the 30$^\circ$- twisted bilayer graphene, the 30$^\circ$- twisted bilayer BC$_3$, and the 45$^\circ$- twisted bilayer cuprates. The $g+ig$- $h+ih$- and $d+id$- TSCs with HAM $L=4,5$ and $2$ can emerge in certain doping regimes in these systems, respectively.
Submission history
From: Fan Yang [view email][v1] Wed, 5 Jan 2022 15:21:55 GMT (4021kb,D)
[v2] Mon, 10 Jan 2022 17:59:03 GMT (4021kb,D)
[v3] Sun, 16 Jan 2022 15:31:09 GMT (4022kb,D)
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