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Mott Quantum Criticality in the Anisotropic 2D Hubbard Model
Benjamin Lenz1, Salvatore R Manmana1, Thomas Pruschke1
1Institute for Theoretical Physics, University of Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany.
Physical Review Letters
|March 12, 2016
Summary
We found Mott quantum criticality in a 2D system, where interchain hopping controls the metal-insulator transition. This reveals new insights into quantum critical points in organic conductors.
Area of Science:
- Condensed Matter Physics
- Quantum Materials
- Materials Science
Background:
- Mott transitions describe the metal-insulator transition in strongly correlated systems.
- Quantum criticality occurs at absolute zero temperature, influencing material properties.
- Anisotropic systems and Hubbard models are key to understanding complex electronic behaviors.
Purpose of the Study:
- To investigate Mott quantum criticality in an anisotropic 2D system of coupled Hubbard chains.
- To identify the control parameter driving the metal-insulator transition to zero temperature.
- To explore the implications for layered organic conductors.
Main Methods:
- Variational Cluster Approximation (VCA)
- Cluster Dynamical Mean-Field Theory (CDMFT)
- Analysis of Fermi pocket volume changes
Main Results:
- Evidence for Mott quantum criticality at half-filling in the studied system.
- Interchain hopping (t⊥) as the critical parameter, driving the transition to zero temperature at t⊥c/t≃0.2.
- Continuous vanishing of Fermi pockets below t⊥c and a first-order transition above.
Conclusions:
- The findings support a quantum critical point scenario in anisotropic 2D systems.
- The study provides a theoretical framework relevant to understanding elusive quantum critical points in organic conductors.
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