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PRODID:https://murmitoyen.com/events/vanille/udem/
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UID:69e05df6d9cb9
DTSTAMP:20260415T235638
DTSTART:20131216T113000
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20131216T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/279250
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Possible charge analogues of spin transfer torques in bulk supercon
 ductors – Ion Garate\, UdeS
DESCRIPTION:Ion Garate\, Département de physique\, Université de Sherbroo
 ke\, QC\, Canada Spin transfer torques (STT) occur when electric currents
  travel through inhomogeneously magnetized systems and are important for 
 the motion of magnetic textures such as domain walls. Since superconductor
 s are easy-plane ferromagnets in particle-hole (charge) space\, it is natu
 ral to ask whether any charge duals of STT phenomena exist therein. We fin
 d that the superconducting analogue of the adiabatic STT vanishes in a bul
 k superconductor with a momentum-independent order parameter\, while the s
 uperconducting counterpart of the nonadiabatic STT does not vanish. This n
 onvanishing superconducting torque is induced by heat (rather than charge)
  currents and acts on the charge (rather than spin) degree of freedom. It 
 can become significant in the vicinity of the superconducting transition t
 emperature\, where it generates a net quasiparticle charge and alters the 
 dispersion and linewidth of low-frequency collective modes.  Site web du
  groupe de  Prof. Garate'sCette conférence est présentée par le RQMP Ve
 rsant Nord du Département de physique de l'Université de Montréal et l
 e Département de génie physique de Polytechnique Montréal.
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