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DTSTART:20260717T100000Z
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20260717T110000Z
LOCATION:Seminar Room
SUMMARY:ICFO | JIMIN ZHAO
CLASS:PUBLIC
DESCRIPTION:I will present our recent works on high-pressure ultrafast spec
 troscopy. We innovated an on-site in situ high pressure pump-probe ultrafa
 st spectroscopy instrument [1\,2]\, which enables precise measurements of 
 both the amplitudes and lifetimes\, featuring independent tuning and preci
 se control of pressure and temperature at low and varying temperatures. Us
 ing this instrument\, we found pressure-induced phonon-bottleneck effect [
 3]. Further\, we have achieved time-resolved low temperature ultrafast spe
 ctroscopy of LaH10&plusmn\;&delta\; under an ultrahigh pressure [4]. This 
 first ultrafast dynamics investigation of superhydrides provides direct ex
 perimental evidence that strong EPC is responsible for the near-room-tempe
 rature superconductivity in clathrate superhydrides. Significantly\, we ha
 ve experimental detected the ultrafast dynamics of pressurized nickelate s
 uperconductor La3Ni2O7\, revealing relatively strong EPC and precisely mea
 suring its superconducting gap [5]. Finally\, our high-precision ultrafast
  collective dynamic measurements uncover an emergent quantum state in the 
 CDW material 1T-TaS₂ below 65 K [6].
DTSTAMP:20260717T053749Z
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