Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series LPENS-MDQ
Subjects cond-mat
Date Monday 10 February 2025
Time 13:30
Institute LPENS
Seminar Room W (24 rue d'Ulm)
Speaker's Last Name Fève
Speaker's First Name Gwendal
Speaker's Email Address
Speaker's Institution LPENS
Title Electron quantum optics: from single electrons to anyons
Abstract Two-dimensional conductors placed in strong magnetic fields enable ballistic guidance of electronic trajectories. Combined with the use of electrostatic gates for the partitioning of electric currents, the ballistic propagation of electronic excitations has enabled the realization of electronic interferometers, such as Fabry-Perot or Mach-Zehnder interferometers. In recent years, the development of single electron sources has led to the emergence of electron quantum optics, which aims at manipulating the quantum state of individual electronic excitations propagating in a quantum conductor. While these experiments bear many similarities to conventional quantum optics (based on the manipulation of photons), there is a fundamental difference between the two systems: unlike photons, electrons interact strongly with each other via the Coulomb interaction. In highly correlated conductors, these interactions can give rise to new elementary excitations with exotic behavior. These particles, called anyons, have properties intermediate between fermions and bosons, characterized by a fractional exchange phase. In my talk, I'll show how two- particle interferometry (also known as Hanbury-Brown and Twiss interferometry) can be used to finely characterize the elementary excitations of quantum conductors: electrons in the regime of weak interactions and anyons in strongly correlated conductors.
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