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DTSTAMP:20260424T143224Z
UID:1699351200@ist.ac.at
DTSTART:20231107T110000
DTEND:20231107T120000
DESCRIPTION:Speaker: Christoph Stampfer\nhosted by Hryhoriy Polshyn\nAbstra
 ct: Graphene and bilayer graphene (BLG) are attractive platforms for quant
 um electronics\, quantum circuits and quantum information science in gener
 al. This has motivated substantial efforts in studying quantum dot (QD) de
 vices based on graphene and BLG. The major challenge in this context is th
 e missing band-gap in graphene\, which does not allow to electrostatically
  confining electrons. A widely used approach to tackle this problem was to
  introduce a hard-wall confinement by etching the graphene sheet. However\
 , the influence of edge disorder\, turned out to be a roadblock for obtain
 ing clean quantum devices. The problem of edge disorder can be circumvente
 d in clean BLG\, thanks to the fact that this material offers a tunable ba
 nd-gap (up to 120 meV) in the presence of a perpendicularly applied electr
 ic field\, a feature that allows introducing electrostatic soft confinemen
 t in BLG.Here I present gate-controlled single and double quantum dot oper
 ation in electrostatically gapped BLG. I show a remarkable degree of contr
 ol of our devices\, which allows the implementation of gate-defined electr
 on-hole and electron-electron double-dot systems\, where single-electron o
 ccupation becomes possible. Also in the single dot regime\, the very few e
 lectron/hole regime has been reached\, excited state energies have been ex
 tracted and their evolution in a parallel and perpendicular magnetic field
  has been investigated. I will show data on ultra-clean BLG quantum dots a
 llowing to investigate the spin-valley coupling in bilayer graphene\, the 
 electron-hole crossover and the high symmetry between electron and hole st
 ates. Finally\, I will show data on BLG quantum dots that allow to investi
 gating the spin and valley lifetimes. Our work paves the way for the impl
 ementation of spin and valley-qubits in graphene.
LOCATION:Office Bldg West / Ground floor / Heinzel Seminar Room (I21.EG.101
 )\, ISTA
ORGANIZER:mpucher@ist.ac.at
SUMMARY:Christoph Stampfer: Quantum Dots in Bilayer Graphene 
URL:https://talks-calendar.ista.ac.at/events/4441
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