Universal theory of strange metals from spatially random interactions

Science, Journal Year: 2023, Volume and Issue: 381(6659), P. 790 - 793

Published: Aug. 17, 2023

Strange metals-ubiquitous in correlated quantum materials-transport electrical charge at low temperatures but not by the individual electronic quasiparticle excitations, which carry ordinary metals. In this work, we consider two-dimensional metals of fermions coupled to critical scalars, latter representing order parameters or fractionalized particles. We show that (T), such generically exhibit strange metal behavior with a T-linear resistivity arising from spatially random fluctuations fermion-scalar Yukawa couplings about nonzero spatial average. also find T ln(1/T) specific heat and rationale for Planckian bound on transport scattering time. These results are agreement observations obtained large N expansion an ensemble fermion flavors.

Language: Английский

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Flat bands promoted by Hund's rule coupling in the candidate double-layer high-temperature superconductor La3Ni2O7 under high pressure

Physical review. B./Physical review. B, Journal Year: 2024, Volume and Issue: 109(8)

Published: Feb. 8, 2024

This work describes systematic strongly correlated electronic structure calculations for the candidate double-layer high-temperature superconductor La${}_{3}$Ni${}_{2}$O${}_{7}$ under pressure. These reveal localized-itinerant duality of Ni ${d}_{{z}^{2}}$ electrons, flat and ${d}_{{x}^{2}\ensuremath{-}{y}^{2}}$ quasiparticle bands, strong interlayer antiferromagnetic correlations due to interplay orbital-selective Mott, Hund, Kondo physics. results imply a two-component theory with possibly preformed pairing superconductivity in pressurized La${}_{3}$Ni${}_{2}$O${}_{7}$. The strange metallicity normal state is also explained from lifetimes.

Language: Английский

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Colloquium : Quantum batteries

Reviews of Modern Physics, Journal Year: 2024, Volume and Issue: 96(3)

Published: July 9, 2024

Storage of energy in quantum devices is practical relevance for applications technologies. The topic attracts attention also a more foundational character due to the possibility that charging power and work extraction can benefit from coherence collective effects. This Colloquium reviews theoretical concepts experimental implementations storage batteries drawing on thermodynamics information science.

Language: Английский

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Hydrodynamic Electronic Transport

Annual Review of Condensed Matter Physics, Journal Year: 2024, Volume and Issue: 15(1), P. 17 - 44

Published: March 11, 2024

The “flow” of electric currents and heat in standard metals is diffusive with electronic motion randomized by impurities. However, for ultraclean metals, electrons can flow like water their being described the equations hydrodynamics. While theoretically postulated, this situation was highly elusive decades. In past decade, several experimental groups have found strong indications type flow, especially graphene-based devices. review, we give an overview some recent key developments, on both theoretical sides.

Language: Английский

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Reconciling scaling of the optical conductivity of cuprate superconductors with Planckian resistivity and specific heat

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: May 26, 2023

Materials tuned to a quantum critical point display universal scaling properties as function of temperature $T$ and frequency $\omega$. A long-standing puzzle regarding cuprate superconductors has been the observed power-law dependence optical conductivity with an exponent smaller than one, in contrast $T$-linear resistivity $\omega$-linear scattering rate. Here, we present analyze La$_{2-x}$Sr$_x$CuO$_4$ $x=0.24$. We demonstrate $\hbar\omega/k_{\mathrm{B}} T$ data over wide range temperature, resistivity, effective mass proportional $\sim \ln corroborating previous specific heat experiments. show that $T,\omega$-linear Ansatz for inelastic rate leads unified theoretical description experimental data, including conductivity. This framework provides new opportunities describing unique matter.

Language: Английский

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Speed limits and locality in many-body quantum dynamics

Reports on Progress in Physics, Journal Year: 2023, Volume and Issue: 86(11), P. 116001 - 116001

Published: Sept. 18, 2023

We review the mathematical speed limits on quantum information processing in many-body systems. After proof of Lieb-Robinson Theorem 1972, past two decades have seen substantial developments its application to other questions, such as simulatability systems classical or computers, generation entanglement, and even properties ground states gapped Moreover, bounds been extended non-trivial ways, demonstrate with power-law interactions interacting bosons, prove notions locality that arise cartoon models for gravity all-to-all interactions. overview progress which has occurred, highlight most promising results techniques, discuss some central outstanding questions remain open. To help bring newcomers field up speed, we provide self-contained proofs field's essential results.

Language: Английский

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Localization of overdamped bosonic modes and transport in strange metals

Proceedings of the National Academy of Sciences, Journal Year: 2024, Volume and Issue: 121(14)

Published: March 29, 2024

The strange metal phase of correlated electrons materials was described in a recent theory by model Fermi surface coupled two-dimensional quantum critical bosonic field with spatially random Yukawa coupling. With the assumption self-averaging randomness, similar to that Sachdev–Ye–Kitaev model, numerous observed properties were obtained for wide range intermediate temperatures, including linear temperature resistivity. Harris criterion implies spatial fluctuations local position point must dominate at lower temperatures. For an M -component boson ≥ 2 , we use multiple graphics processing units (GPUs) compute real frequency spectrum propagator self-consistent mean-field treatment self-interactions, but exact realizations randomness from mass. We find Landau damping fermions leads emergence physics transverse-field Ising low as has been proposed Hoyos, Kotabage, and Vojta. This regime is controlled localized overdamped eigenmodes scalar field, also resistivity which nearly linear-in-temperature, extends into “quantum phase” away point, several cuprates. = 1 scalar, not applicable, so Hybrid Monte Carlo simulations running on GPUs; rounded transition localization physics, behavior extended region around transition.

Language: Английский

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Enhanced Strange Metallicity due to Hubbard- U Coulomb Repulsion

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

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Linear-in-temperature conductance in two-dimensional electron fluids

Physical review. B./Physical review. B, Journal Year: 2025, Volume and Issue: 111(8)

Published: Feb. 7, 2025

Language: Английский

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Quantum phase transitions beyond critical exponents: Microscopic scales and universal role of the Planckian time

Physical review. B./Physical review. B, Journal Year: 2025, Volume and Issue: 111(16)

Published: April 8, 2025

Language: Английский

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