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DTSTAMP:20260424T102106Z
UID:6450beae9053a303393096@ist.ac.at
DTSTART:20230623T110000
DTEND:20230623T120000
DESCRIPTION:Speaker: Justin Song\nhosted by Maksym Serbyn\nAbstract: The ab
 ility to differentiate between forward and backward flows (non-reciprocity
 ) is a critical device function. Non-reciprocity is often effected by usin
 g a magnetic field. I will describe a different\, field-free\, and non-cla
 ssical paradigm that exploits the intricate winding of electronic wavefunc
 tions in quantum materials (captured by topology and quantum geometry). Us
 ing plasmonics as an illustrative (but not exclusive) example\, I will det
 ail how the Berry curvature and the quantum metric (quantum geometric quan
 tities) enable intrinsically non-reciprocal plasmons in anomalous Hall and
  antiferromagnetic metals. Interestingly\, this quantum non-reciprocity ca
 n be pushed to the extreme limit: when a non-magnetic metal such as graphe
 ne is driven by linearly polarized light\, it can spontaneously magnetize 
 exhibiting a dynamical ferromagnetic state sustained by a self-induced (se
 lf-Floquet) Berry flux. Such quantum non-reciprocity demonstrates how the 
 geometry of wavefunctions can be used as a versatile quantum resource to e
 ngineer chiral quantum matter.
LOCATION:Office Bldg West / Ground floor / Heinzel Seminar Room (I21.EG.101
 )\, ISTA
ORGANIZER:cpetz@ist.ac.at
SUMMARY:Justin Song: Non-reciprocal quantum materials
URL:https://talks-calendar.ista.ac.at/events/4261
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