26ème Congrès Général de la SFP

Electronic structure of the metal-to-insulator transition in VO2

Non programmé

20m

Centre des Congrès de la Villette (Cité des sciences et de l'Industrie, Paris)

Poster MC8 Dernières avancées dans le domaine des technologies quantiques Session Poster 2: MC1, MC4, MC8, MC10, MC12, MC14, MC20, MC21, MC23, MC24, MC25, REDP

Orateur

Emma David (ISMO, Orsay)

Description

The strongly correlated material $V{O}_2$ displays a metal-to-insulator (MIT) transition when going below $T_{MIT}=280K$. Alongside this electronic transition, the material undergoes a structural transition from a rutile structure in the metallic phase to a monoclinic structure in the insulating phase. These simultaneous transitions have created a long-lasting debate within the community: is the electronic transition induced by the structural changes (Peierls transition) or is it happening alongside it (Mott transition) [1]? This question has been nicknamed the chicken-and-egg dilemma [2] of condensed matter. Recent ARPES studies addressed the changes of the electronic structure of $V{O}_2$ across the transition [3].

However, a detailed imaging of the evolution of the conduction band spectral function in the transition regime is still lacking. I will present our ongoing ARPES studies on $V{O}_2$ where we were able to observe a progressive transfer of spectral weight between two distinct states composing the conduction band.

References:

[1] Dynamical Singlets and Correlation-Assisted Peierls Transition in VO2, Silke Biermann et al., Physical Review Letters (2005)
[2] Resolving the VO2 controversy: Mott mechanism dominates the insulator-to-metal transition, O. Nájera et al., Physical Review B. (2017)
[3] Photoelectron dispersion in metallic and insulating VO2 thin films, Viktor Jonsson et al., Physical Review Research (2021)