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SUMMARY:Orbital magnetic susceptibility as a thermodynamic probe of band s
 tructure and quantum geometry in atomic vdW materials
DTSTART;VALUE=DATE-TIME:20260511T070000Z
DTEND;VALUE=DATE-TIME:20260511T080000Z
DTSTAMP;VALUE=DATE-TIME:20260524T050900Z
UID:indico-event-5003@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Weifeng Zhi (智伟峰) (Weizmann Institute of Scien
 ce)\n\nHost: Prof. Haibiao Zhou  Venue: TDLI Meeting Room N400Tencent 
 Meeting link: https://meeting.tencent.com/dm/3tUgrWI9TSn3 Meeting ID: 40
 4204829\, no password Abstract:We introduce orbital magnetic susceptibili
 ty as a thermodynamic probe of band structure and quantum geometry in atom
 ically thin van der Waals materials. Using scanning SQUID-on-tip magnetome
 try\, we image local susceptibility in a moiré graphene system with elect
 ric-field tunability and strong electron interactions. Combined with theor
 etical analysis\, we show that the measured susceptibility has an orbital 
 origin and exhibits rich structure tied to key electronic features\, inclu
 ding Lifshitz transitions and interaction effects. Importantly\, orbital s
 usceptibility encodes geometric information—such as Berry curvature\, qu
 antum metric\, and orbital magnetic moment—making it an effective thermo
 dynamic “quantum ruler” for quantum geometry\, even in time-reversal-s
 ymmetric systems. At higher magnetic fields beyond the linear-response reg
 ime\, the same orbital degree of freedom gives rise to strong valley polar
 ization and an apparent insulating state at half filling that paradoxicall
 y exhibits quantum oscillations. Biography:Weifeng Zhi got his bachelor
 ’s degree from the School of Physics\, Peking University in 2023. He the
 n joined the group of Professor Eli Zeldov in the Department of Condensed 
 Matter Physics\, Weizmann Institute of Science where got his master’s de
 gree in physics in 2025. Currently he is a PhD student in condensed matter
  physics at the Weizmann Institute. His research interest focuses on nanos
 cale magnetic imaging in quantum materials using scanning SQUID on tip mic
 roscopy.\n\nhttps://indico-tdli.sjtu.edu.cn/event/5003/
LOCATION:Tsung-Dao Lee Institute/N4F-N400 - meeting room (Tsung-Dao Lee In
 stitute)
URL:https://indico-tdli.sjtu.edu.cn/event/5003/
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