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DTSTAMP:20260424T040532Z
UID:1760947200@ist.ac.at
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DESCRIPTION:Speaker: Daniel Kazenwadel\nhosted by Charles Roques-Carmes\nAb
 stract: Vanadium dioxide (VO) and its enigmatic insulator–to–metal tra
 nsition near room temperature have been intensively studied since their di
 scovery in the 1960s [1]. In this talk\, I will report results on a variet
 y of transient states that emerge during the transition under different ex
 ternal stimuli. When VO is slowly heated through the transition\, the proc
 ess is dominated by microscopic cooperativity [2]\, giving rise to phase f
 luctuations and supercooling phenomena [3]. When the material is driven ac
 ross the transition by femtosecond laser excitation\, there is a transient
  state with phase coexistence of insulating and metallic domains. We obser
 ve it with energy-filtered ultrafast electron diffraction [4] using photoe
 mitted electrons from the nanometer-sized tip of a transmission electron m
 icroscope [5]. At high excitation fluences\, we uncover evidence for a sho
 rt-lived plasmonic state of canalized light that can be used to write dire
 ctional and switchable surface structures [6]. 1.         F. J. Mo
 rin\, Oxides which show a metal-to-insulator transition at the Neel temper
 ature. Phys. Rev. Lett. 3\, 34–36 (1959).2.         J. Holder\, D
 . Kazenwadel\, P. Nielaba\, P. Baum\, Determination of the nearest-neighbo
 r interaction in VO via fractal dimension analysis Phys. Rev. Res. 5\, 043
 272 (Dec. 2023).3.         D. Kazenwadel\, R. Schwenzer\, E. Steine
 r\, J. Holder\, P. Baum\, Spontaneous supercooling by rapid domain collaps
 e. Manuscript in preparation4.         D. Kazenwadel\, J. Holder\, 
 P. Nielaba\, P. Baum\, Disorder explains the ultrafast photo-induced hidde
 n phase in VO2. Manuscript in preparation5.         D. Kazenwadel\,
  J. Holder\, J. Kuttruff\, P. Baum\, Energy offset between femtosecond and
  thermal electrons in nanometer field-emitter tips. Phys. Rev. Appl. 24\, 
 024021 (2025).6.         D. Kazenwadel\, N. Neathery\, P. Baum\, Ca
 nalized light creates directional and switchable surface structures in van
 adium dioxide. Nat. Commun. 16\, 3960 (2025).Laser-induced periodic surfac
 e structures in VO2 [6]. DANIEL KAZENWADEL\, b. 1995\, MSc in Physics (Un
 iversity of Konstanz\, 2020)\; PhD student (University of Konstanz\, 2020
 –present)
LOCATION:Mondi 2\, Central Building \, ISTA
ORGANIZER:omerhalil.unal@ist.ac.at
SUMMARY:Daniel Kazenwadel: Transient Electronic and Structural States in Va
 nadium Dioxide
URL:https://talks-calendar.ista.ac.at/events/6046
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