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CATEGORIES:Seminar
DESCRIPTION:Engineering Emergent Correlated States with Complex Quantum Mat
 erials \n\nNew electronic states often emerge at atomically clean interface
 s between parent states hosted in distinct crystalline lattices. Yet some o
 f the most interesting strongly correlated parent states exist only in comp
 lex materials which are difficult to handle.\n\nIn this talk\, I will demon
 strate two different strategies for realizing emergent correlated electroni
 c states by design. First\, using a novel cryogenic van der Waals stacking 
 technique\, we created twist Josephson junctions between high temperature B
 i2Sr2CaCu2O8+x superconductors with quality approaching that between CuO2 l
 ayers within single crystals. At 45 degree twist angle\, we observe half-in
 teger Shapiro steps and spontaneous time-reversal symmetry breaking\, consi
 stent with the emergence of predicted interfacial high-temperature topologi
 cal superconductivity. Next\, I discuss our discovery of the single-crystal
  superconductor BaTa2S5\, whose superlattice of weakly coupled H-TaS2 monol
 ayers achieve high electronic mobility while breaking inversion symmetry of
  the parent 2H-TaS2 compound. Using multiple independent experimental probe
 s\, we uncover a magnetic field induced phase transition between distinct s
 uperconducting states\, one of which survives well beyond 60 T\, at least 1
 2 times the Pauli limit. This phase boundary intersects the superconducting
 -normal boundary exactly at an upturn in HC2(T)\, pointing to the emergence
  of field-induced spin-triplet superconductivity.\n\nBio: Frank Zhao earned
  his B.Sc. (Honors) degree at University of Toronto\, where he studied math
 ematics and physics. For his doctoral research\, he studied emergent quantu
 m phenomena at atomically clean interfaces between air sensitive 2D materia
 ls in mesoscopic devices\, with Philip Kim at Columbia and Harvard Universi
 ty. He continued his research at MIT with Joe Checkelsky where he synthesiz
 ed new unconventional superconductors\, which he measured using structural\
 , transport and magnetic probes at low temperature and high magnetic field.
  He will combine material synthesis and cryogenic van der Waals stacking te
 chniques to discover emergent phenomena at the interface between quantum ma
 terials.
DTEND:20250826T172000Z
DTSTAMP:20260305T135253Z
DTSTART:20250826T162000Z
GEO:42.449741;-76.481209
LOCATION:Clark Hall\, 700
SEQUENCE:0
SUMMARY:LASSP/AEP Seminar: S.Y. Frank Zhao (Maryland)
UID:tag:localist.com\,2008:EventInstance_50542764004784
URL:https://events.cornell.edu/event/lasspaep-seminar-sy-frank-zhao-marylan
 d
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