The strongly correlated material displays a metal-to-insulator (MIT) transition when going below . 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 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 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)
Affiliation de l'auteur principal |
ISMO, Université-Paris-Saclay, Orsay
|
Daisuke Shiga
(KEK Photon Factory, Japan)
Amitayush Jha-Thakur
(ISMO, Orsay)
Maximilian Thees
(ISMO, Orsay)
Pedro Henrique Rezende Gonçalves
(ISMO, Orsay)
Alexandre Antezak
(ISMO, Orsay)
Xianglin Cheng
(KEK Photon Factory, Japan)
Taehyun Kim
(KEK Photon Factory, Japan)
Tatsuhiko Kanda
(KEK Photon Factory, Japan)
Emmanouil Frantzeskakis
(ISMO, Orsay)
Franck Fortuna
(ISMO, Orsay)
Andrew Mayne
(ISMO, Orsay)
Hiroshi Kumigashira
(KEK Photon Factory, Japan)
Andres Santander
(ISMO, Orsay)