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DTSTART:20260329T030000
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DTSTAMP:20260424T170558Z
UID:1771927200@ist.ac.at
DTSTART:20260224T110000
DTEND:20260224T120000
DESCRIPTION:Speaker: Katharina Franke\nhosted by Latha Venkataraman \nAbstr
 act: In addition to being an ideal tool for imaging and manipulating atoms
  and molecules on surfaces\, the potential of the scanning tunneling micro
 scope (STM) for high-resolution spectroscopy has been recognized in the fi
 elds of single-molecule physics\, magnetism\, and superconductivity. Recen
 tly\, optical and terahertz pulses coupled into the STM junction have adde
 d ultrafast time resolution to this versatile experimental technique. Here
 \, we use the STM to resolve the interplay of magnetic atoms with supercon
 ducting substrates. The magnetic adsorbates induce bound states - known as
  Yu-Shiba-Rusinov (YSR) states - within the superconducting energy gap. Th
 ese states remain isolated from the bulk\, and\, thus\, provide a wide ran
 ge of possibilities for engineering hybridized states\, band formation\, a
 nd topology. In a very different experiment we add time resolution to our 
 STM experiments. To do so\, we couple THz pulses into the STM junction and
  then record the time-delayed response of the junction conductance. We app
 ly this pump-probe scheme to investigate the role of defects on phonon pro
 perties of the indirect bandgap semiconductor 2H-MoTe2. We identify two co
 herent phonons modes in the Fourier transform of the time-delay spectra. I
 n the vicinity of defects\, the relative intensity of the phonon modes cha
 nges. We ascribe this change to modified band bending near the defects\, w
 hich changes the coupling efficiency to the THz pulses
LOCATION:Office Bldg West / Ground floor / Heinzel Seminar Room (I21.EG.101
 )\, ISTA
ORGANIZER:Rita.Pacarada@ist.ac.at
SUMMARY:Katharina Franke: Atomic-scale spectroscopy: from magnetic adatoms 
 on superconductors to  coherent phonons on semiconductors
URL:https://talks-calendar.ista.ac.at/events/6269
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