---
abstract: 'We consider the dimer Hubbard model within Dynamical Mean Field Theory to study the interplay and competition between Mott and Peierls physics. We describe the various metal-insulator transition lines of the phase diagram and the break down of the different solutions that occur along them. We focus on the specific issue of the debated Mott-Peierls insulator crossover and describe the systematic evolution of the electronic structure across the phase diagram. We found that at low intra-dimer hopping the emerging local magnetic moments can unbind above a characteristic singlet temperature $T^*$. Upon increasing the inter-dimer hopping subtle changes occur in the electronic structure. Notably, we find Hubbard bands of a mix character with coherent and incoherent excitations. We argue that this state is relevant for VO$_2$ and its signatures may be observed in spectroscopic studies, and possibly through pump-probe experiments.'
author:
- 'O. Nájera'
- 'M. Civelli'
- 'V. Dobrosavljević'
- 'M. J. Rozenberg'
bibliography:
- '../biblio.bib'
title:
- 
- 'Multiple crossovers and coherent states in a Mott-Peierls insulator'
---

Introduction {#sec:org4c72b07}
============

Vanadates are fascinating materials that provide a fertile playground to study non-trivial phase transitions driven by the electronic correlation. Their structures follow the Magnéli series V$_n$O$_{2n-1}$ 