We demonstrate that a finite-doping quantum critical point (QCP) naturally descends from the existence of a first-order Mott transition in the phase diagram of a strongly correlated material. In a prototypical case of a first-order Mott transition the surface associated with the equation of state for the homogeneous system is "folded" so that in a range of parameters stable metallic and insulating phases exist and are connected by an unstable metallic branch. Here we show that tuning the chemical potential, the zero-temperature equation of state gradually unfolds. Under general conditions, we find that the Mott transition evolves into a first-order transition between two metals, associated with a phase separation region ending in the finite -doping QCP. This scenario is here demonstrated solving a minimal multiorbital Hubbard model relevant for the iron-based superconductors, but its origin-the splitting of the atomic ground state multiplet by a small energy scale, here Hund's coupling-is much more general. A strong analogy with cuprate superconductors is traced.

Mott Quantum Critical Points at Finite Doping / Chatzieleftheriou, Maria; Kowalski, Alexander; Berović, Maja; Amaricci, Adriano; Capone, Massimo; De Leo, Lorenzo; Sangiovanni, Giorgio; de' Medici, Luca. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 130:6(2023), pp. 1-7. [10.1103/PhysRevLett.130.066401]

Mott Quantum Critical Points at Finite Doping

Amaricci, Adriano;Capone, Massimo;De Leo, Lorenzo;Sangiovanni, Giorgio;de’ Medici Luca
2023-01-01

Abstract

We demonstrate that a finite-doping quantum critical point (QCP) naturally descends from the existence of a first-order Mott transition in the phase diagram of a strongly correlated material. In a prototypical case of a first-order Mott transition the surface associated with the equation of state for the homogeneous system is "folded" so that in a range of parameters stable metallic and insulating phases exist and are connected by an unstable metallic branch. Here we show that tuning the chemical potential, the zero-temperature equation of state gradually unfolds. Under general conditions, we find that the Mott transition evolves into a first-order transition between two metals, associated with a phase separation region ending in the finite -doping QCP. This scenario is here demonstrated solving a minimal multiorbital Hubbard model relevant for the iron-based superconductors, but its origin-the splitting of the atomic ground state multiplet by a small energy scale, here Hund's coupling-is much more general. A strong analogy with cuprate superconductors is traced.
2023
130
6
1
7
066401
https://arxiv.org/abs/2203.02451
Chatzieleftheriou, Maria; Kowalski, Alexander; Berović, Maja; Amaricci, Adriano; Capone, Massimo; De Leo, Lorenzo; Sangiovanni, Giorgio; de' Medici, Luca
File in questo prodotto:
File Dimensione Formato  
2203.02451.pdf

accesso aperto

Descrizione: Submitted Version
Tipologia: Documento in Pre-print
Licenza: Non specificato
Dimensione 1.54 MB
Formato Adobe PDF
1.54 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/137492
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 6
  • ???jsp.display-item.citation.isi??? 3
social impact