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UID:69e1a41497af5
DTSTAMP:20260416T230804
DTSTART:20130128T113000
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20130128T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/164813
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Transient Terahertz Photoconductivity of Insulating Cuprates
DESCRIPTION:J Steven Dodge\, Department of Physics\, Simon Fraser Universit
 y\, Burnaby\, B.C\, CanadaExperiments yield contradictory results on the d
 egree to which charge carriers are localized in doped copper oxides. Angle
 -resolved photoemission spectroscopy suggests that a single hole is local
 ized as a small polaron. Optical measurements also indicate that bound hol
 es form small polarons\, but that free holes are best described as large p
 olarons. Finally\, DC transport measurements on lightly doped compounds g
 ive surprisingly high carrier mobility\, suggesting that the charge excita
 tions become more extended with increasing carrier density. As an alterna
 tive to DC transport measurements on chemically doped samples\, we use vis
 ible-pump\, terahertz-probe spectroscopy to determine the mobility of car
 riers photoexcited in the insulating layered cuprates Sr2CuO2Cl2\, YBa2Cu3
 O6\, and La2CuO4. We find that the initial mobility approaches that of lig
 htly doped cuprates\, then decays on picosecond timescales to values more
  consistent with hopping transport.Site web du groupe du Prof. DodgeCette 
 conférence est présentée par le RQMP Versant Nord du Département de p
 hysique de l'Université de Montréal et le Département de Génie physiqu
 e de Polytechnique Montréal.
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