BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-9811
DTSTART:20261019T160000Z
DTEND:20261019T180000Z
DTSTAMP:20260826T023253Z
LAST-MODIFIED:20260824T172036Z
LOCATION:Chamberlin 5280
SUMMARY:Probing Element Specific Ultrafast Carrier and Spin Dynamics i
 n Quantum and Magnetic Materials using X-FAST Instrument\, Preliminary
  Exam\, Aakankshya Mishra
DESCRIPTION:Emerging quantum and magnetic materials host strongly coup
 led electronic\, spin\, and lattice degrees of freedom that can evolve
  on femtosecond timescales\, making their nonequilibrium behavior impo
 rtant for understanding and ultimately controlling material properties
  relevant to future information and quantum technologies. This work us
 es X-ray Femtosecond Absorption Spectroscopy Tabletop (X-FAST)\, a lab
 oratory-based extreme-ultraviolet (XUV) transient absorption instrumen
 t\, to investigate these ultrafast processes with element specificity.
  X-FAST employs high-harmonic generation (HHG) to produce femtosecond 
 XUV pulses that probe element-specific core-to-valence transitions fol
 lowing excitation by an ultrafast optical pump. This preliminary exami
 nation will introduce the motivation for studying emerging quantum and
  magnetic materials\, the fundamentals and development of HHG-based ta
 bletop XUV sources\, and the experimental methodology and optimization
  of the X-FAST instrument. The capabilities of X-FAST will be demonstr
 ated through measurements of 2H-MoTe₂ as a benchmark system and thro
 ugh studies of MnPtGa\, where element-specific transient absorption pr
 ovides insight into photoinduced carrier redistribution and its connec
 tion to the material’s magnetic electronic structure. In addition\, 
 the development and integration of a cryogenic sample environment will
  extend X-FAST toward temperature-dependent measurements\, enabling th
 e separation of electronic\, magnetic\, and lattice contributions and 
 the investigation of phase-dependent ultrafast dynamics. Finally\, fut
 ure directions will focus on expanding the range of quantum and magnet
 ic materials studied with X-FAST and advancing the instrument toward a
  versatile platform for probing and understanding nonequilibrium mater
 ial behavior across ultrafast timescales and variable temperatures.
URL:https://www.physics.wisc.edu/events/?id=9811
END:VEVENT
END:VCALENDAR