Related Experiment Video
Updated: May 28, 2025
06:53
Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
1.9K
Enhanced Strange Metallicity due to Hubbard-U Coulomb Repulsion
Andrew Hardy1,2, Olivier Parcollet2,3, Antoine Georges2,4,5,6
1University of Toronto, Department of Physics, 60 Saint George Street, Toronto, Ontario M5S 1A7, Canada.
Physical Review Letters
|February 10, 2025
Summary
We reveal how strong electron repulsion and quantum critical fluctuations create strange metals. This breakdown of standard physics explains unusual low-temperature behavior observed in materials like moiré systems.
Area of Science:
- Condensed Matter Physics
- Quantum Materials Science
Background:
- Understanding electron interactions is key to novel material properties.
- Fermi liquid theory describes conventional metals but fails at quantum critical points.
- Strange metallicity is observed in materials near a Mott transition.
Purpose of the Study:
- To investigate electron behavior in a model with strong Coulomb repulsion and bosonic fluctuations.
- To explore the emergence of strange metallicity and its connection to quantum criticality.
- To understand the role of Mott transitions in limiting strange metal properties.
Main Methods:
- Solving a model of electrons with Hubbard-U repulsion and Yukawa coupling using extended dynamical mean field theory.
- Analyzing the quantum critical point and its impact on electron quasiparticle decay rates.
- Investigating the interplay between Mott transitions and strange metallic behavior.
Main Results:
- A quantum critical point emerges where electron repulsion amplifies bosonic fluctuations.
- Fermi liquid theory breaks down, leading to strange metal behavior with Planckian quasiparticle decay rates.
- The Mott transition appears to set a maximum decay rate for the strange metal.
Conclusions:
- The study provides a theoretical framework for understanding low-temperature strange metallicity near Mott transitions.
- Results offer insights into experimental observations in materials such as moiré systems.
- The findings highlight the breakdown of conventional metallic behavior under strong correlations and quantum criticality.
Related Concept Videos
02:58Crystal Field Theory - Octahedral Complexes
26.1K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.1K
03:02Colors and Magnetism
11.5K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.5K
02:42Valence Bond Theory
8.4K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.4K
03:08Atomic Radii and Effective Nuclear Charge
51.1K
The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
51.1K
02:32Bonding in Metals
46.8K
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
46.8K
01:19Complexation Equilibria: The Chelate Effect
421
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
421