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SUMMARY:MechE Colloquium: Nanotube mechanical resonators – tiny electron
  forces and large electron backaction
DTSTART:20211019T121500
DTEND:20211019T131500
DTSTAMP:20260528T184211Z
UID:6ace8c59fff3923bc8372b2d00d63ca77284862a7de4e638e4b5a670
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Adrian Bachtold\, Quantum NanoElectronics And NanoMechan
 ics\, The Barcelona Institute of Science and Technology (ICFO)\nAbstract:\
 nMechanical resonators based on carbon nanotubes feature a series of truly
  exceptional properties. In particular\, the mechanical vibrations are hig
 hly sensitive to the tiny forces associated with the electron states in th
 e nanotube and vice versa\, leading to large backaction effects. In this t
 alk\, I will discuss our efforts to cool the amplitude of the thermal vibr
 ations to a few quanta. Cooling is achieved using a simple yet powerful me
 thod\, which consists in applying a constant (DC) current of electrons thr
 ough the suspended nanotube in a dilution fridge. I will also present resu
 lts where we strongly couple mechanical vibrations to the two electron sta
 tes involved in single-electron tunnelling (SET). It renormalizes the reso
 nance frequency by a large amount\, up to 25 % of its value. This results 
 in a highly nonlinear potential for mechanical vibrations despite the rela
 tively low quanta population (about 80 quanta). I will finish the presenta
 tion by explaining our effort towards the realization of a mechanical qubi
 t.\n\nBio:\nAdrian Bachtold studied physics at the EPFL and got his PhD fr
 om the University of Basel. He is now the principal investigator of the Qu
 antum NanoElectronics & NanoMechanics group at ICFO in Barcelona. His acti
 vities focus on the mesoscopic investigation of both quantum electron tran
 sport and mechanical resonators. He is APS fellow and is recipient of the 
 CNRS medal and the IBM award of the Swiss Physical Society. He received tw
 o ERC grants. Out of the 20 PhD students and postdoc fellows that worked i
 n his group\, 13 of them have a permanent position in academic research.
LOCATION:BM 5202 https://plan.epfl.ch/?room==BM%205202 https://epfl.zoom.u
 s/j/65093257313
STATUS:CONFIRMED
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