Research in the faculty

Condensed matter

Particle & Astroparticle

News & Updates

  • Congratulations to Roi Holtzman

    Recipient of the Chaim Mida Prize in Theoretical Physics
    Date: 
    February 01, 2024
  • Congratulations to Dror Berechya

    Recipient of the Chaim Mida Prize in Theoretical Physics
    Date: 
    February 01, 2024
  • Congratulations to Luca Teodori

    Recipient of the Chaim Mida Prize in Theoretical Physics
    Date: 
    February 01, 2024

Upcoming events

  • Physics Colloquium

    Fractional statistics of anyons in mesoscopic colliders

    Colloquia
    Department of Condensed Matter Physics
    Date:
    21
    March, 2024
    Thursday
    Hour: 11:15-12:30
    | Prof. Gwendal Fève , Sorbonne University , Paris, France
    In three-dimensional space, elementary particles are divided between fermions and bosons according to the properties of symmetry of the wave function describing the state of the system when two particles are exchanged. When exchanging two fermions, the wave function acquires a phase, φ=π. On the other hand, in the case of bosons, this phase is zero, φ=0. This difference leads to deeply distinct collective behaviors between fermions, which tend to exclude themselves, and bosons which tend to bunch together. The situation is different in two-dimensional systems which can host exotic quasiparticles, called anyons, which obey intermediate quantum statistics characterized by a phase φ varying between 0 and π [1,2]. For example in the fractional quantum Hall regime, obtained by applying a strong magnetic field perpendicular to a two-dimensional electron gas, elementary excitations carry a fractional charge [3,4] and have been predicted to obey fractional statistics [1,2] with an exchange phase φ=π/m (where m is an odd integer). Using metallic gates deposited on top of the electron gas, beam-splitters of anyon beams can be implemented. I will present how the fractional statistics of anyons can be revealed in collider geometries, where anyon sources are placed at the input of a beam-splitter [5,6]. The partitioning of anyon beams is characterized by the formation of packets of anyons at the splitter output. This results in the observation of strong negative correlations of the electrical current, which value is governed by the anyon fractional exchange phase φ [5,7]. [1] B. I. Halperin, Phys. Rev. Lett. 52, 1583–1586 (1984). [2] D. Arovas, J. R. Schrieffer, F. Wilczek, Phys. Rev. Lett. 53, 722–723 (1984). [3] R. de Picciotto et al., Nature 389, 162–164 (1997). [4] L. Saminadayar, D. C. Glattli, Y. Jin, B. Etienne, Phys. Rev. Lett. 79, 2526–2529 (1997) [5] B. Rosenow, I. P. Levkivskyi, B. I. Halperin, Phys. Rev. Lett. 116, 156802 (2016). [6] H. Bartolomei et al. Science 368, 173-177 (2020). [7] Lee, JY.M., Sim, HS, Nature Communications 13, 6660 (2022).