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UID:DSC-12545
DTSTART;TZID=Europe/Berlin:20170223T133000
SEQUENCE:1487836182
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20170223T143000
URL:https://dresden-science-calendar.de/calendar/en/detail/12545
LOCATION:IFW\, Helmholtzstraße 2001069 Dresden
SUMMARY:Guyader: 1T-TaS2 charge density wave under the microscope of MeV ul
 trafast electron diffraction 
CLASS:PUBLIC
DESCRIPTION:Speaker: Dr.  Loic Le Guyader\nInstitute of Speaker: Spectrosco
 py & Coherent Scattering European XFEL GmbH\nTopics:\nMaterialien\, Physik
 \n Location:\n  Name: IFW (D2E.27\, IFW Dresden)\n  Street: Helmholtzstra
 ße 20\n  City: 01069 Dresden\n  Phone: \n  Fax: \nDescription: Abstract R
 ecent developments in the control of charge density wave (CDW)\, i.e. a co
 mbined periodic modulation of the electron density and a periodic lattice 
 distortion\, with either current or fs laser pulses could open the door fo
 r novel electronic devices. [1-4] The 1T polytype of TaS2 displays a rich 
 phase diagram\, with metallic phases characterized by various degrees of c
 ommensurability above 180 K and an insulating commensurate CDW phase below
 . Fs laser excitation can induce a metallic metastable hidden phase. [3\,4
 ] While CDW systems are essentially thought of as 2-dimensional systems\, 
 it is speculated that the insulating and conducting phase properties are d
 riven by the layer stacking order in the 3rd dimension. [5] How and on whi
 ch time scale does the stacking order evolves upon femtosecond laser excit
 ation? Using the 3 MeV electron diffraction setup at SLAC\, [6] we investi
 gated the ultrafast dynamics of the commensurate to incommensurate phase t
 ransition upon excitation by a femtosecond 800 nm wavelength laser pulse. 
 Taking advantage of the nearly flat Ewald sphere displayed by 3 MeV electr
 ons\, we measured simultaneously a complete set of CDW satellites reflecti
 ons\, evidencing an unexpected different behavior between the layer stacki
 ng order and partial disorder.
DTSTAMP:20260627T054625Z
CREATED:20170218T073711Z
LAST-MODIFIED:20170223T074942Z
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