Flat bands, strange metals and the Kondo effect

JG Checkelsky, BA Bernevig, P Coleman, Q Si… - Nature Reviews …, 2024 - nature.com
Flat-band materials such as the kagome metals or moiré superlattices are of intense current
interest. Flat bands can result from the electron motion on numerous (special) lattices and …

Strange metals and black holes: insights from the Sachdev-Ye-Kitaev model

S Sachdev - arxiv preprint arxiv:2305.01001, 2023 - arxiv.org
Complex many-particle quantum entanglement is a central theme in two distinct major topics
in physics: the strange metal state found in numerous correlated electron compounds, and …

Localization of overdamped bosonic modes and transport in strange metals

AA Patel, P Lunts, S Sachdev - Proceedings of the National Academy of …, 2024 - pnas.org
The strange metal phase of correlated electrons materials was described in a recent theory
by a model of a Fermi surface coupled a two-dimensional quantum critical bosonic field with …

Strange metal and superconductor in the two-dimensional Yukawa-Sachdev-Ye-Kitaev model

C Li, D Valentinis, AA Patel, H Guo, J Schmalian… - Physical Review Letters, 2024 - APS
The two-dimensional Yukawa-Sachdev-Ye-Kitaev (2D-YSYK) model provides a universal
theory of quantum phase transitions in metals in the presence of quenched random spatial …

-linear resistivity, optical conductivity, and Planckian transport for a holographic local quantum critical metal in a periodic potential

F Balm, N Chagnet, S Arend, J Aretz, K Grosvenor… - Physical Review B, 2023 - APS
High-T c cuprate strange metals are characterized by a DC resistivity that scales linearly with
T from the onset of superconductivity to the crystal melting temperature, characterized by a …

Correlation between phase stiffness and condensation energy across the non-Fermi to Fermi-liquid crossover in the Yukawa-Sachdev-Ye-Kitaev model on a lattice

D Valentinis, GA Inkof, J Schmalian - Physical Review Research, 2023 - APS
We construct and analyze a lattice generalization of the Yukawa-Sachdev-Ye-Kitaev model,
where spinful fermions experience onsite, random, all-to-all interactions with an Einstein …

Enhanced Strange Metallicity due to Hubbard- Coulomb Repulsion

A Hardy, O Parcollet, A Georges, AA Patel - Physical Review Letters, 2025 - APS
We solve a model of electrons with Hubbard-U Coulomb repulsion and a random Yukawa
coupling to a two-dimensional bosonic bath, using an extended dynamical mean field theory …

Quantum spin glasses and Sachdev-Ye-Kitaev models

S Sachdev - arxiv preprint arxiv:2402.17824, 2024 - arxiv.org
A brief survey of some random quantum models with infinite-range couplings is presented,
ranging from the quantum Ising model to the Sachdev-Ye-Kitaev model. The Sachdev-Ye …

Controlled expansion for transport in a class of non-Fermi liquids

ZD Shi - Physical Review B, 2024 - APS
Non-Fermi liquids arise when strong interactions destroy stable fermionic quasiparticles.
The simplest models featuring this phenomenon involve a Fermi surface coupled to …

Feynman diagrammatics based on discrete pole representations: A path to renormalized perturbation theories

D Gazizova, L Zhang, E Gull, JPF LeBlanc - Physical Review B, 2024 - APS
By merging algorithmic Matsubara integration with discrete pole representations we present
a procedure to generate fully analytic closed form results for impurity problems at fixed …