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SUMMARY:Non-equilibrium effects in superconducting thin films probed by ti
 me-domain THz spectroscopy. - Chiara Ciccarelli
DTSTART:20241120T111500Z
DTEND:20241120T120000Z
UID:TALK222229@talks.cam.ac.uk
CONTACT:Mads Fonager Hansen
DESCRIPTION:Superconducting logic holds the promise of significant improve
 ment compared to traditional semiconductor logic\, both in terms of comput
 ational power and energy consumption\, due to the lack of ohmic losses whe
 n transferring bits. However\, most of these advantages are negated by the
  lack of a suitable cryogenic memory that can be coupled to the supercondu
 cting logic.\n\nThe ambition of superconducting spintronics is to integrat
 e magnetic and superconducting elements in a unique device that combines p
 ermanent storage and low power logic characteristics. The new opportunitie
 s that superconductivity offers to spintronics were realised only quite re
 cently. Instead\, conventional superconductivity and magnetism were long b
 elieved to be mutually exclusive since in s-wave superconductors\, Cooper 
 pairs are in a singlet state and are therefore inadequate for carrying spi
 n-information. But recently\, new discoveries have shown new routes for su
 perconductivity and magnetism to co-operate\, enabling novel device concep
 ts based on the interplay between spin\, charge and superconducting phase 
 coherence. This includes the condensation of spin-polarised triplet Cooper
  pairs in conventional superconductors interfaced by heavy metals [1-5].\n
 \nTHz transmission spectroscopy is an extremely powerful tool to character
 ise conventional superconductors because the superconducting gap falls wit
 hin the bandwidth of the THz pulse that is generated for example by optica
 l rectification in a ZnTe crystal. The great advantage of THz transmission
  spectroscopy\, in comparison to other gap-spectroscopy techniques such as
  STM\, resides in the fact that it is time-resolved. We can therefore appl
 y it to quantify the  melting/recovery dynamics of the superconducting con
 densate subject to a fast perturbation and to detect new transient superco
 nducting correlation states. In this talk  I will give an overview on the 
 non-equilibrium studies carried in superconductors via time-domain spectro
 scopy and show our very recent effort in using time-domain THz spectroscop
 y to resolve the interactions at the interface between thin-films supercon
 ductors and normal metals and how these affect the superconductor’s dyna
 mics.\n\n[1] Nature Materials 17\, 499 (2018)\n\n[2] Phys. Rev. Appl.\, 11
 \, 014061 (2019)\n\n[3] Phys. Rev. B 99\, 024507 (2019)\n\n[4] Phys. Rev. 
 X 10\, 031020 (2020)\n\n[5] Phys. Rev. B 99\, 144503 (2019)
LOCATION:West Hub\, South Room
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