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UID:DSC-19433
DTSTART;TZID=Europe/Berlin:20230125T130000
SEQUENCE:1674628612
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20230125T143000
URL:https://dresden-science-calendar.de/calendar/en/detail/19433
LOCATION:TUD\,    
SUMMARY:Priessnitz: Broadband THz Emission and THz High Harmonic Generation
  in the Delafossite PdCoO2
CLASS:PUBLIC
DESCRIPTION:Speaker: Tim Priessnitz\nInstitute of Speaker: Max Planck Insti
 tute for Solid State Research\, Stuttgart\, Germany\nTopics:\nPhysik\n Loc
 ation:\n  Name: TUD (HSZ/204/U)\n  Street:   \n  City:  \n  Phone: \n  Fax
 : \nDescription: <p><strong>Abstract:</strong></p>  <p>Terahertz (THz) rad
 iation became a powerful tool with widespread applications ranging from im
 aging and spectroscopy to nonlinear optical control of materials. However\
 , efficient and scalable THz sources remain rare. Here\, we present a nove
 l approach to generate THz radiation making use of an ultrafast current in
 duced via the transverse thermoelectric effect (TTE). We realize this in o
 ff-cut grown thin films of the delafossite PdCoO2 and the cuprate La1.84S
 r0.16CuO4 driven by ~200 fs laser pulses resulting in an ultrafast transi
 ent diffusion of charge carriers. We will show an extended characterizatio
 n of the TTE-based THz generation by means of THz emission spectroscopy an
 d will provide a first basic phenomenological model. Furthermore\, we will
  discuss the finding of THz generation in the light of varying laser fluen
 ce\, the application of an external magnetic field and low temperatures. C
 oming from a broadband THz generation mechanism with a promising applicati
 on potential\, we also investigated the nonlinear transport by means of TH
 z high harmonic generation (HHG) spectroscopy. Optical phenomena such as T
 Hz HHG are proposed to provide a more efficient way to probe of exotic tra
 nsport effects\, such as hydrodynamic electron flow\, than previously stud
 ied DC transport measurements\, which identified the delafossite PdCoO2 a
 s another candidate to observe such properties. We will present and discus
 s polarization and temperature dependent THz HHG from PdCoO2 thin films t
 hat shows potential signatures of hydrodynamic transport\, contributing to
  the ongoing discussion of low temperature origins of THz HHG.</p>  <p>Inv
 ited by Professor Stefan Kaiser</p>
DTSTAMP:20260417T220352Z
CREATED:20230119T063952Z
LAST-MODIFIED:20230125T063652Z
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