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Agenda

 

   Thermodynamics of Fractional Quantum Hall States in Graphene Devices

 

Alexandre Assouline (Institut Néel)

 

Date/Horaire : le mardi 11 février 2025 à 14h00

 

Lieu : Salle Rémy Lemaire K223, Institut Néel

 

Résumé : Non-Abelian states of matter retain memory of the order in which their quasiparticles are exchanged, presenting an intriguing possibility in condensed matter physics. While some fractional quantum Hall states are expected to host non-Abelian quasiparticles, they have been notoriously difficult to probe due to the narrow energy range over which they are realized. In this talk, I will report the quantitative determination of fractional quantum Hall energy gaps in bilayer graphene using both thermally activated transport and direct measurements of the chemical potential. These experiments establish bilayer graphene as a robust platform for probing the non-Abelian anyons expected to arise as the elementary excitations of even-denominator fractional quantum Hall states. Additionally, I will show that chemical potential measurements can be used to extract the entropy of quantum Hall phases, providing new insights into the nature of their excitations.