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UID:0-751@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20201208T110000
DTEND;TZID=Europe/Paris:20201208T120000
DTSTAMP:20201126T145015Z
URL:https://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lpt
 ms-gwendall-feve-lpens/
SUMMARY:Séminaire du LPTMS : Gwendal Fève (LPENS) - LPTMS (100% online se
 minar) - 8 Déc 20 11:00
DESCRIPTION:Fractional statistics of anyons in a mesoscopic collider\nGwend
 al Fève (LPENS)\n\nOnline seminar --- ZOOM Meeting ID: 929 5714 7926 -- P
 assword: 084622 --\n\n\nIn three-dimensional space\, elementary particles 
 are divided between fermions and bosons according to the properties of sym
 metry of the wave function describing the state of the system when two par
 ticles are exchanged. When exchanging two fermions\, the wave function acq
 uires a phase pi. On the other hand\, in the case of bosons\, this phase i
 s zero. This difference leads to deeply distinct collective behaviors betw
 een fermions\, which tend to exclude themselves\, and bosons which tend to
  bunch together. The situation is different in two-dimensional systems whi
 ch can host exotic quasiparticles\, called anyons\, which obey intermediat
 e quantum statistics characterized by a phase varying between 0 and pi [1\
 ,2].\n\nFor example in the fractional quantum Hall regime\, obtained by ap
 plying a strong magnetic field perpendicular to a two-dimensional electron
  gas\, elementary excitations carry a fractional charge [3\,4] and have be
 en predicted to obey fractional statistics [1\,2] with an exchange phase p
 i/m (where m is an odd integer). I will present how fractional statistics 
 of anyons can be demonstrated in this system by implementing and studying 
 anyon collisions at a beam-splitter [5]. The collisions are first studied 
 in the low magnetic field regime\, where the elementary excitations are el
 ectrons which obey the usual fermionic statistics. It leads to the observa
 tion of an antibunching effect in an electron collision: electrons systema
 tically exit in two different arms of the beam-splitter. The observed resu
 lt is completely different in the fractional quantum Hall regime. Fraction
 al statistics lead to a suppression of the antibunching effect and quasipa
 rticles tend to bunch together in larger packets of charge in a single out
 put of the splitter. This effect leads to the observation of negative corr
 elations of the current fluctuations [5] in perfect agreement with recent 
 theoretical predictions [6].\n\n\n[1] B. I. Halperin\, Phys. Rev. Lett. 52
 \, 1583–1586 (1984).\n[2] D. Arovas\, J. R. Schrieffer\, F. Wilczek\, Ph
 ys. Rev. Lett. 53\, 722–723 (1984).\n[3] R. de Picciotto et al.\, Nature
  389\, 162–164 (1997). \n[4] L. Saminadayar\, D. C. Glattli\, Y. Jin\, B
 . Etienne\, Phys. Rev. Lett. 79\, 2526–2529 (1997)\n[5] H. Bartolomei\, 
 M. Kumar et al. Science 368\, 173-177 (2020).\n[6] B. Rosenow\, I. P. Levk
 ivskyi\, B. I. Halperin\, Phys. Rev. Lett. 116\, 156802 (2016).\n\n\n\n\n\
 n\n
CATEGORIES:seminars
LOCATION:LPTMS (100% online seminar)\, LPTMS - Bâtiment Pascal n° 530 rue
  André Rivière - Université Paris-Saclay\, Orsay\, 91405\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=LPTMS - Bâtiment Pascal n
 ° 530 rue André Rivière - Université Paris-Saclay\, Orsay\, 91405\, Fr
 ance;X-APPLE-RADIUS=100;X-TITLE=LPTMS (100% online seminar):geo:0,0
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TZID:Europe/Paris
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DTSTART:20201025T020000
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