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SUMMARY:Sounds good: useful phonons - Professor Tony Kent\, The university
  of Nottingham
DTSTART:20190424T130000Z
DTEND:20190424T140000Z
UID:TALK123649@talks.cam.ac.uk
CONTACT:Dr Kaveh Delfanazari
DESCRIPTION:When considering quantum electronic transport phenomena\, phon
 ons have got a bad name for themselves for causing scattering/dephasing\, 
 etc. However\, we have shown that coherent phonons (bulk acoustic waves) w
 ith frequencies up to about one terahertz can be used for controlled high-
 speed manipulation of electronic transport\, with potential applications i
 n microwave electronics and detectors for acoustic nanoscopy. The bulk aco
 ustic waves are generated by femtosecond pulsed laser excitation of thin f
 ilm transducers and interact with the \nelectronic states in semiconductor
  nanostructures via the deformation \npotential coupling. We have previous
 ly demonstrated bulk acoustic \nwave-driven transport effects in Schottky 
 and resonant tunneling \ndevices and 2D electron systems. In this presenta
 tion\, I will review \nsome of our past results\, leading up to our recent
  demonstration of \nusing bulk acoustic waves to modulate\, at high-speed\
 , the THz emission \nfrom a quantum cascade laser.
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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