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SUMMARY:Tunable Competing Orders in Van Hove Metals: Case Studies of Few-L
 ayer van der Waals Systems\, Prof. Yi-Ting Hsu\, University of Notre Dame
DTSTART:20260519T053000Z
DTEND:20260519T070000Z
DTSTAMP:20260525T002900Z
UID:indico-event-204@indico.phys.nthu.edu.tw
DESCRIPTION:Few-layer van der Waals materials offer a versatile platform t
 o investigate correlated quantum phases. A central theme in both twisted a
 nd untwisted graphene and transition metal dichalcogenides systems is the 
 emergence of Van Hove singularities (VHS)\, which strongly enhance electro
 nic interactions and can drive competing orders.In this talk\, I will disc
 uss how few-layer van der Waals systems near the Van Hove filling can be g
 enerally described by a Van Hove Metal\, where the symmetry-broken and top
 ological phases arise solely from intra- and inter-VHS interactions within
  a renormalization group framework\, largely independent of the Fermi surf
 ace details. I will show that by tuning the number and type of VHS—throu
 gh spin-orbit coupling\, external fields\, or twist angle—one can engine
 er controlled competition among orders. I will illustrate this mechanism t
 hrough two case studies: twisted bilayer WSe2 and Bernal bilayer graphene 
 proximitized by WSe2\, and discuss experimental probes that can test these
  predictions. Our findings highlight Van Hove fermiology as a general stra
 tegy to design and control exotic phases in two-dimensional quantum materi
 als.\nReferences:[1] YTH\, Wu\, Das Sarma\, Phys. Rev. B 102\, 085103 (202
 0). Editor’s suggestion. [2] YTH\, Wu\, Das Sarma\, Phys. Rev. B 104\, 
 195134 (2021).  [3] Son\, YTH\, Kim\, Phys. Rev. B 111\, 115144 (2025). E
 ditor’s suggestion. [4] Yang and YTH\, arXiv:2508.21119 (Accepted by Co
 mmunications Physics)\n\nhttps://indico.phys.nthu.edu.tw/event/204/
LOCATION:R124
URL:https://indico.phys.nthu.edu.tw/event/204/
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