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X-ORIGINAL-URL:https://www.lps.u-psud.fr/
X-WR-CALNAME:Laboratoire de physique des Solides
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BEGIN:VEVENT
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DTSTART;TZID=Europe/Paris:20240111T110000
DTEND;TZID=Europe/Paris:20240111T120000
DTSTAMP:20240108T085000
UID:MEC-66bf858e119401396053e04633d95637@lps.u-psud.fr
CREATED:20240108
LAST-MODIFIED:20240108
PRIORITY:5
TRANSP:OPAQUE
SUMMARY:D.GUERCI: Helical trilayer graphene and superconductivity in heterobilayer TMDs
DESCRIPTION:\nI will present helical trilayer graphene (hTTG), which is characterized by an emergent real-space Chern mosaic pattern resulting from the interface of two incommensurate moiré lattices [1]. This pattern shows macroscopic regions with finite Chern number separated by domain walls where the spectrum is gapless [2]. After introducing the Hamiltonian describing hTTG, I will focus on the macroscopic domains, that host isolated flat bands with intriguing properties. Upon investigating the chiral limit, where analytical expressions can be derived, we found that the flat-band zero-energy manifold features a Chern-1 and a Chern-2 band described by the superposition of two lowest Landau levels [2,3]. The origin of the flat bands can be explained using a combination of geometrical relations and symmetry arguments [2,3]. The comparison with the recent experimental findings from reference [4] is discussed.\n\nIn the second part, I shift focus to a mechanism for inducing superconductivity in heterobilayer transition metal dichalcogenides (TMDs) from a repulsive electron model [5]. Notably, the interplay of symmetries and geometrical properties leads to the emergence of a p-wave Z2 topological superconductivity. This phenomenon persists even at low doping levels, paving the way for exploring the long-sought p-wave BEC-BCS topological transition.\n\n[1] Y.Mao, D.Guerci, C.Mora, PRB 107, 125423 (2023) [Editors' Suggestion] [2] D.Guerci, Y.Mao, C.Mora, arXiv:2305.03702 (2023)\n[3] D.Guerci, Y.Mao, C.Mora, arXiv:2308.02638 (2023)\n[4] L.Xia, P.Jarillo-Herrero et al., arXiv:2310.12204 (2023)\n[5] V.Crépel*, D. Guerci* et al., PRL 131, 056001 (2023) [Editors' Suggestion] [* equally contributing authors]\n
URL:https://www.lps.u-psud.fr/en/events/d-guerci-helical-trilayer-graphene-and-superconductivity-in-heterobilayer-tmds/
CATEGORIES:Condensed Matter Theory Seminar
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