Two-Band Electronic Reconstruction Induced via Correlation and CDW Order Effects.

Craco, L.

The emergence of a charge density wave (CDW) in transition-metal dichalcogenides opens up a route to charge order, followed by superconductivity at low temperatures. A key question here concerns how many particle electron–electron interations govern the low-energy electronic structure in the normal and CDW states. Using dynamical mean-field theory, we explore the many-body properties of an extended, two-band Hubbard model applicable to 2 H -TaSe2. We reveal the electronic structure reconstruction in the normal and CDW states driven by two-band dynamical correlations. Our results demonstrate a remarkable renormalization of the Ta- 5 d bands crossing the Fermi level, showing a continuous reduction in the CDW gap up to an incomplete gapping, followed by a CDW to a CDW–Mott phase transition pertinent to strongly correlated transition-metal dichalcogenides.

HUBBARD model; CHARGE density waves; PHASE transitions; FERMI level; ELECTRONIC structure

Condensed Matter, 2024, Vol 9, Issue 4, p42

2410-3896

Academic Journal

10.3390/condmat9040042