Two $T$-linear scattering-rate regimes in the triangular lattice Hubbard model DOI Creative Commons
Jérôme Fournier, P.-O. Downey, Charles-David Hébert

et al.

SciPost Physics, Journal Year: 2024, Volume and Issue: 17(3)

Published: Sept. 4, 2024

In recent years, the T T -linear scattering rate found at low temperatures, defining strange metal phase of cuprates, has been a subject interest. Since wide range materials have that obeys equation $ / ≈ k_B T$, idea universal Planckian limit on proposed. However, there is no consensus proposed theories yet. this work, we present our results for in triangular lattice Hubbard model obtained using dynamical cluster approximation. We find two regions with - p display="inline">p diagram: one emerges from pseudogap to correlated Fermi liquid transition doping, whereas other solely caused by large interaction strength doping.

Language: Английский

Enhanced Strange Metallicity due to Hubbard- U Coulomb Repulsion DOI
Andrew Hardy, Olivier Parcollet, Antoine Georges

et al.

Physical Review Letters, Journal Year: 2025, Volume and Issue: 134(3)

Published: Jan. 23, 2025

We solve a model of electrons with Hubbard-U Coulomb repulsion and random Yukawa coupling to two-dimensional bosonic bath, using an extended dynamical mean field theory scheme. Our exhibits quantum critical point, at which the repulsive component electron interactions strongly enhances effects fluctuations on electrons, leading breakdown Fermi liquid physics formation strange metal "Planckian" [O(kBT/ℏ)] quasiparticle decay rates low temperatures T→0. Furthermore, eventual Mott transition that occurs as is increased seemingly bounds maximum rate in metal. results provide insight into low-temperature metallicity observed proximity transition, observed, for instance, recent experiments certain moiré materials. locked icon Physics Subject Headings (PhySH)Dynamical theoryNon-Fermi-liquid theorySachdev-Ye-Kitaev

Language: Английский

Citations

1
Solvable models of two-level systems coupled to itinerant electrons: Robust non-Fermi liquid and quantum critical pairing DOI

Evyatar Tulipman,

Noga Bashan, Jörg Schmalian

et al.

Physical review. B./Physical review. B, Journal Year: 2024, Volume and Issue: 110(15)

Published: Oct. 9, 2024

Strange metal behavior is traditionally associated with an underlying putative quantum critical point at zero temperature.However, in many correlated metals, e.g., high-Tc cuprate superconductors, strange metallicity persists low temperatures over extended range of microscopic parameters, suggesting the existence phase, whose possible physical origins remain poorly understood.Systematic investigations scenarios giving rise to such a critical, non-Fermi liquid (NFL) phase are therefore crucial better understand this puzzling behavior.In previous work [1], we considered solvable large-N model consisting itinerant electrons coupled local two-level systems (TLSs) via spatially random interactions, inspired by possibility emergent metallic glassiness due frustrated competing orders, and found that system hosts NFL tunable exponents intermediate couplings.In work, expand our investigation following: (i) We study extent which generic considering various deformations theory, including coupling multiple operators TLSs arbitrarily directed TLS-fields.We find picture obtained [1] qualitatively persist wide region parameter space, showcasing robustness phase; (ii) analyze superconducting instability electrons, rich structure, pairing conventional BCS weak strong limits; (iii) elaborate on analysis Ref.[1], single-particle, transport thermodynamic properties.1 For recent detailed density tunneling defects glasses, see Ref.

Language: Английский

Citations

4
Strange Metal and Superconductor in the Two-Dimensional Yukawa-Sachdev-Ye-Kitaev Model DOI
Chenyuan Li, Davide Valentinis, Aavishkar A. Patel

et al.

Physical Review Letters, Journal Year: 2024, Volume and Issue: 133(18)

Published: Oct. 30, 2024

The two-dimensional Yukawa-Sachdev-Ye-Kitaev (2D-YSYK) model provides a universal theory of quantum phase transitions in metals the presence quenched random spatial fluctuations local position critical point. It has Fermi surface coupled to scalar field by spatially Yukawa interactions. We present full numerical solutions self-consistent disorder averaged analysis 2D-YSYK both normal and superconducting states, obtaining electronic spectral functions, frequency-dependent conductivity, superfluid stiffness. Our results reproduce key aspects observations cuprates as analyzed Michon et al. [Nat. Commun. 14, 3033 (2023)NCAOBW2041-172310.1038/s41467-023-38762-5]. also find regime increasing zero temperature stiffness with decreasing temperature, is observed bulk cuprates.

Language: Английский

Citations

4
Linear- T resistivity from spatially random vector coupling DOI

Yili Wang,

Xian-Hui Ge, Sang-Jin Sin

et al.

Physical review. B./Physical review. B, Journal Year: 2025, Volume and Issue: 111(11)

Published: March 13, 2025

Language: Английский

Citations

0
The foot, the fan, and the cuprate phase diagram: Fermi-volume-changing quantum phase transitions DOI
Subir Sachdev

Physica C Superconductivity, Journal Year: 2025, Volume and Issue: unknown, P. 1354707 - 1354707

Published: April 1, 2025

Language: Английский

Citations

0
Spin-Stripe Order Tied to the Pseudogap Phase in La1.8−xEu0.2Srx DOI Creative Commons
Anne Missiaen,

H. Mayaffre,

S. Krämer

et al.

Physical Review X, Journal Year: 2025, Volume and Issue: 15(2)

Published: April 10, 2025

Although spin and charge stripes in high-Tc cuprates have been extensively studied, the exact range of carrier concentration over which they form a static order remains uncertain, complicating efforts to understand their significance. The problem is challenging due combined effects quenched disorder competition with superconductivity—both significant cuprates—which add inherent difficulty determining phase boundaries. In La2−xSrxCuO4 (LSCO) zero external magnetic field, are confined doping well below p*, pseudogap boundary at temperature. However, when high fields suppress competing effect superconductivity, spin-stripe found extend up p*. Here, we investigate La1.8−xEu0.2SrxCuO4 (Eu-LSCO) using La139 nuclear resonance observe field-dependent fluctuations suggesting similar between superconductivity as LSCO. Nevertheless, find that present practically p* irrespective field strength: stronger stripe Eu-LSCO prevents from enforcing nonmagnetic ground state, except very close p*. Thus, consistently bounded by p* both LSCO Eu-LSCO, despite differing balances superconductivity. This indicates canonical order, where spins charges intertwined pattern, fundamentally tied phase, though nature this connection has yet be elucidated. Any beyond endpoint must then different nature: Either orders remain intertwined, but fluctuating, or only fluctuates while static. presence p* pervasive, slow, fluctuations, electronic inhomogeneity documented work, all carefully considered discussions Fermi surface transformations, putative quantum criticality, strange metal behavior. Published American Physical Society 2025

Language: Английский

Citations

0
Projective fixed points for non-Fermi liquids: A case study of the Ising-nematic quantum critical metal DOI

Shubham Kukreja,

Afshin Besharat,

Sung-Sik Lee

et al.

Physical review. B./Physical review. B, Journal Year: 2024, Volume and Issue: 110(15)

Published: Oct. 18, 2024

Language: Английский

Citations

3
Strong local bosonic fluctuations: The key to understanding strongly correlated metals DOI
S. R. Hassan,

Gopal Prakash,

N. S. Vidhyadhiraja

et al.

Physical review. B./Physical review. B, Journal Year: 2024, Volume and Issue: 110(7)

Published: Aug. 5, 2024

In this paper, we present a theoretical framework for understanding the extremely correlated Fermi liquid (ECFL) phenomenon within $U=\ensuremath{\infty}$ Hubbard model. Our approach involves deriving equations of motion single-particle Green's function $G$ and its associated self-energy $\mathrm{\ensuremath{\Sigma}}$, which product bosonic correlation comprising both density $({D}_{N})$ spin $({D}_{S})$ correlations with $G$. By solving these self-consistently, explore behavior $G$, ${D}_{N}$, ${D}_{S}$ as functions frequency, temperature, hole concentration. results reveal distinct coherent incoherent regimes characterized by presence or absence quasiparticle excitations. Additionally, analyze intrinsic dc resistivity $\ensuremath{\rho}(T)$, observing crossover from ${T}^{2}$ to linear increasing temperature. findings delineate liquid, quantum incoherent, ``classical'' in strongly systems, emphasizing importance diffusive local charge fluctuations.

Language: Английский

Citations

1
Two $T$-linear scattering-rate regimes in the triangular lattice Hubbard model DOI Creative Commons
Jérôme Fournier, P.-O. Downey, Charles-David Hébert

et al.

SciPost Physics, Journal Year: 2024, Volume and Issue: 17(3)

Published: Sept. 4, 2024

In recent years, the T T -linear scattering rate found at low temperatures, defining strange metal phase of cuprates, has been a subject interest. Since wide range materials have that obeys equation $ / ≈ k_B T$, idea universal Planckian limit on proposed. However, there is no consensus proposed theories yet. this work, we present our results for in triangular lattice Hubbard model obtained using dynamical cluster approximation. We find two regions with - p display="inline">p diagram: one emerges from pseudogap to correlated Fermi liquid transition doping, whereas other solely caused by large interaction strength doping.

Language: Английский

Citations

1