Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session M44: Next-Generation Moir Quantum MatterInvited Live Streamed
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Sponsoring Units: DCMP Chair: Pablo Jarillo-Herrero, Massachusetts Institute of Technology MI Room: McCormick Place W-375C |
Wednesday, March 16, 2022 8:00AM - 8:36AM |
M44.00001: From strong coupling superconductivity to fractionalization in Moiré materials Invited Speaker: Ashvin Vishwanath
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Wednesday, March 16, 2022 8:36AM - 9:12AM |
M44.00002: Magic-Angle Twisted Graphene Family Invited Speaker: Jeong Min Park Since the discovery of magic-angle twisted bilayer graphene (MATBG), new moiré systems have been explored to study strongly correlated and topologically nontrivial phenomena. Multiple interesting states, such as correlated insulators, quantized anomalous Hall states, ferromagnetism, and correlated Chern insulators, have been observed in various moiré materials. However, during the first few years, superconductivity was reproducibly seen only in MATBG. More recently, magic-angle twisted trilayer graphene (MATTG) has shown robust superconductivity and correlated states with an additional knob for electric displacement field tunability. Is it a coincidence? Interestingly, MATBG and MATTG, which are the only robust moiré superconductors known to date, are part of a hierarchy of magic-angle graphene systems, which exhibit a series of twist angles for different number of twisting layers. We experimentally realize magic-angle twisted 4-layer and 5-layer graphene, and show that they also exhibit robust superconductivity, therefore establishing alternating-twist magic-angle multilayer graphene as a family of moiré superconductors. With the application of electric displacement and magnetic fields, we find interesting similarities and differences that help us understand the underlying physics behind these systems. In this talk, I will discuss the key data and our current understanding of the magic family, as well as present some of our most recent progress. |
Wednesday, March 16, 2022 9:12AM - 9:48AM |
M44.00003: TBD Invited Speaker: Cory R Dean
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Wednesday, March 16, 2022 9:48AM - 10:24AM |
M44.00004: TBD Invited Speaker: feng wang
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Wednesday, March 16, 2022 10:24AM - 11:00AM |
M44.00005: High-temperature topological superconductivity in twisted double-layer copper oxides Invited Speaker: Marcel Franz As a new application of the twist paradigm, we predict that structures composed of two-monolayer-thin d-wave superconductors with a twist angle close to 45° form a robust, fully gapped topological phase with spontaneously broken time-reversal symmetry and protected chiral Majorana edge modes. These structures can be realized by mechanically exfoliating van der Waals-bonded high-Tc copper oxide materials, such as Bi2Sr2CaCu2O8 + δ. Our symmetry arguments and detailed microscopic modelling suggest that this phase will form for a range of twist angles in the vicinity of 45°, and will set in at a temperature close to the bulk superconducting critical temperature of 90 K. Therefore, this platform may provide a long-sought realization of a true high-temperature topological superconductor. Experimentally observable signatures of the T-broken topological phase, including the polar Kerr effect, anomalous Josephson effect and various spectroscopies will also be discussed. |
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