Programme

P.93 -- Posters, VCTP-50

Date: Thursday, 7 August 2025

Time: 08:30 - 10:00

Phase diagram for the pseudogap Kondo effect in graphene

Hung T. Dang (1), Hoa T.M. Nghiem (2)

(1) Faculty of Materials Science and Engineering, Phenikaa University; (2) Phenikaa Institute for Advanced Study, Phenikaa University

Adatoms placed on graphene is a potential direction for investigation in condensed matter physics and materials science. The fundamental problem in this topic is to understand how the Kondo effect exhibits in this system, i.e. how electrons from the graphene screens the impurity. With its linear energy dispersion, graphene can be a potential host material to realize the pseudogap Kondo effect where there is a quantum phase transition from the Kondo screening phase to impurity free local moment. In this work, the full phase diagram for such phase transition is presented, showing linear relation between the electron correlation strength and the impurity energy level at criticality and the nonlinear behavior of the phase boundary with respect to the hybridization between the graphene sheet and the impurity. Detailed analysis shows the important role of the impurity occupancy, which can be used to interpret the behaviors of the phase diagram.

Presenter: Dang The Hung