Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session Y64: Quantum Phase Transitions and Quantum Monte Carlo Simulations
8:00 AM–10:36 AM,
Friday, March 18, 2022
Room: Hyatt Regency Hotel -Grant Park B
Sponsoring Unit: DCMP
Chair: Yixuan Huang, California State University, Northridge
Abstract: Y64.00010 : Quantum critical point and phase separation at finite doping in Hund metals.*
9:48 AM–10:00 AM
Luca de' Medici
Luca de' Medici
A general feature found in models and realistic simulations of these materials, and corroborated by experimental data, is a frontier crossing the doping-interaction strength plane, and originating from the Mott transition point of the half-filled system, across which the aforementioned defining features are strongly enhanced.
This frontier is a cross-over at large doping while approaching half-filling it becomes a first-order transition between two metals. It features a phase separation zone ending in a quantum critical point at finite doping.
I will show that all this phenomenology is due to the first-order nature of the Mott transition and can be back-tracked to a small energy scale splitting the atomic ground-state multiplet, in this case the Hund’s coupling.
I will highlight the perfect parallel with a leading scenario for the physics of the cuprates, and thus possibly a universal one for materials showing high-Tc superconductivity.
*Support from ERC-CoG2016 program to the StrongCoPhy4Energy project (GA No724177) is acknowledged.
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