cond-mat papers | Gist.Science

Persistent short-range charge correlations revealed by ultrafast melting of electronic order in YBa $_2$ Cu $_3$ O $_{6+x}$

Using ultrafast resonant X-ray scattering, researchers discovered that photo-excitation in YBa $_2$ Cu $_3$ O $_{6.67}$ selectively melts long-range charge density wave order while revealing persistent short-range correlations, thereby demonstrating a method to disentangle coexisting electronic orders based on their distinct fluence thresholds and recovery timescales.

C. Seo, L. Shen, A. N. Petsch, S. Wandel, V. Esposito, J. D. Koralek, G. L. Dakovski, M-F. Lin, S. P. Moeller, W. F. Schlotter, A. H. Reid, M. P. Minitti, R. Liang, D. Bonn, W. Hardy, A. Damascelli, C. Giannetti, E. H. da Silva Neto, J. J. Turner, F. Boschini, G. CoslovichThu, 12 Ma🔬 cond-mat

Ab initio quantum embedding description of magic angle twisted bilayer graphene at even-integer fillings

This paper presents an ab initio quantum embedding workflow that derives interacting flat-band Hamiltonians for magic angle twisted bilayer graphene, revealing robust insulating states at $\nu=0$ and $+2$ while uncovering a fragile semimetal with Kekulé modulation at $\nu=-2$ and explaining the resulting particle-hole asymmetry through momentum-dependent single-particle renormalizations.

Raehyun Kim, Woochang Kim, Kevin D. Stubbs, Steven G. Louie, Lin LinThu, 12 Ma🔬 cond-mat

Long-range magnetic order with disordered spin orientations in a high-entropy antiferromagnet

This study reveals that a high-entropy antiferromagnet, (Mn1/4Fe1/4Co1/4Ni1/4)PS3, sustains long-range zigzag magnetic order below 72 K despite significant atomic disorder, where all four transition-metal elements undergo a unified phase transition but maintain distinct spin orientations due to the competition between single-ion anisotropies and exchange interactions.

Yao Shen, Guangkai Zhang, Qinghua Zhang, Xuejuan Gui, Yu Zhang, Heemin Lee, Cheng-Tai Kuo, Jun-Sik Lee, Ronny Sutarto, Feng Ye, Zhao Pan, Xiaomei Qin, Jinchen Wang, Tianping Ying, Youwen LongThu, 12 Ma🔬 cond-mat

Geometric control of motility-induced phase separation

This paper demonstrates that weak, slowly varying curvature on a torus surface provides robust geometric control over the location and morphology of motility-induced phase separation (MIPS) clusters in active Brownian particles, offering a sensitive platform for distinguishing between thermodynamic and kinetic theoretical frameworks.

Toler H. Webb, Helen S. Ansell, Daniel M. SussmanThu, 12 Ma🔬 cond-mat

Disorder-induced localisation in the Mott-Hubbard model

This paper employs the hierarchy of correlations and strong-coupling perturbation theory to demonstrate that while charge disorder induces an energetic and spatial separation between localized and delocalized doublon and holon excitations in the Mott-Hubbard model, spin disorder leads to the localization of states throughout the entire quasi-particle band.

Ričards Kristers Knipšis, Friedemann Queisser, Jesumony Jayabalan, Gael Reecht, Manuel Gruber, Uwe Bovensiepen, Ralf SchützholdThu, 12 Ma🔬 cond-mat

Integrability-breaking-induced Mpemba effect in spin chains

This paper demonstrates that weakly broken integrability in spin chains induces a symmetry-restoration Mpemba effect through two distinct mechanisms: an early-time crossing where hotter systems equilibrate faster due to larger phase space, and a late-time crossing where colder systems overtake them because they sustain superdiffusive spin hydrodynamics for a parametrically longer duration in non-integrable models.

Adam J. McRobertsThu, 12 Ma🔬 cond-mat

Bridge Scaling in Conditioned Henyey-Greenstein Random Walks

This paper uses Monte Carlo simulations to demonstrate that fixed-length bridge paths in three-dimensional Henyey-Greenstein random walks exhibit four significant deviations from classical Brownian-excursion theory—such as super-diffusive amplitude scaling and a Rayleigh midpoint distribution—due to the walk's evolution on a two-dimensional Markovian state space, raising the question of whether these anomalies represent a permanent universality-class shift or a slow crossover.

Claude Zeller (Claude Zeller Consulting LLC)Thu, 12 Ma🔬 cond-mat

Classical Kitaev model in a magnetic field

This paper analyzes the classical Kitaev honeycomb model in a magnetic field, revealing a finite-field spin liquid regime characterized by short-range correlations, specific thermodynamic constraints, and a unique "perfect" compensation of weak site-dilution effects on magnetization.

Paul A. McClarty, Roderich Moessner, Karlo Penc, Jeffrey G. RauThu, 12 Ma🔬 cond-mat

Symmetric localization of $\nu_{\text{tot}}=4/3$ fractional topological insulator edges

Motivated by recent twisted MoTe $_2$ experiments, this paper develops a disordered interacting edge theory for a $\nu_{\text{tot}}=4/3$ fractional topological insulator, revealing distinct conductance phases and an interaction-induced insulating state that demonstrates the insufficiency of two-terminal transport measurements for identifying such systems.

Yang-Zhi Chou, Sankar Das SarmaThu, 12 Ma🔬 cond-mat

On the Wilson-Fisher fixed point in the limit of integer spacetime dimensions

This paper argues that the Wilson-Fisher fixed point at integer dimensions is not identical to the critical Ising model but rather contains it as a subsector, a conclusion supported by the analysis of negative operator multiplicities in the $O(n)$ model and the incompatibility of a literal equality with emergent Virasoro symmetry in two dimensions.

Bernardo ZanMon, 09 Ma🔬 cond-mat

The dual Ginzburg-Landau theory for a holographic superconductor: Finite coupling corrections

This paper derives the exact dual Ginzburg-Landau theory for a minimal holographic superconductor at finite coupling, revealing that the GL parameter increases (making the system more Type-II) and the condensate rises, while correcting previous misconceptions regarding the AdS/CFT dictionary and condensate determination.

Makoto NatsuumeMon, 09 Ma🔬 cond-mat

Possible Enhancement of Superconductivity in Ambient-Pressure La $_3$ Ni $_2$ O $_7$ Thin Film

Using the fluctuation exchange (FLEX) approximation, this study demonstrates that the emergence of a $\delta$ pocket near the $\Gamma$ point in La $_3$ Ni $_2$ O $_7$ thin films enhances $s_{\pm}$ -wave pairing through improved Fermi-surface nesting, suggesting a viable mechanism for boosting superconductivity under ambient pressure.

Yichen Hua, Wenxin He, Wei-Qiang Chen, Jian-jian Miao, Changming YueMon, 09 Ma🔬 cond-mat

Lee-Huang-Yang dynamics emergent from a direct Wigner representation

This paper demonstrates that the truncated Wigner approach can naturally incorporate Lee-Huang-Yang corrections for ultracold Bose gases by tailoring bare interaction parameters, thereby capturing quantum fluctuation effects and correlation dynamics that standard mean-field and extended Gross-Pitaevskii equation formulations fail to describe, particularly in regimes of strong interaction.

King Lun Ng, Maciej Bartłomiej Kruk, Piotr DeuarMon, 09 Ma🔬 cond-mat

Phase transitions in coupled Ising chains and SO( $N$ )-symmetric spin chains

By combining perturbative renormalization group analysis with large-scale matrix-product state simulations, this study demonstrates that quantum phase transitions in coupled Ising chains and SO( $N$ )-symmetric spin systems are continuous for $N=2$ and $N=3$ but become first-order for $N \ge 4$ , thereby refining conjectures about criticality in symmetry-protected topological phase transitions.

Yohei Fuji, Sylvain Capponi, Lukas Devos, Philippe LecheminantMon, 09 Ma🔬 cond-mat

Origin of a shallow electron pocket: $\beta$ -band in Co $_{1/3}$ TaS $_2$ studied by angle-resolved photoemission spectroscopy

This study utilizes angle-resolved photoemission spectroscopy and cluster perturbation theory to demonstrate that the shallow electron pocket ( $\beta$ -band) in Co $_{1/3}$ TaS $_2$ originates from correlation-driven bulk states requiring long-range Co ordering, rather than surface effects or standard DFT+U predictions.

Wojciech Sas, Yuki Utsumi Boucher, Seyed Ashkan Moghadam Ziabari, Gaurav Pransu, Trpimir Ivšic, Ivana Vobornik, Jun Fujii, Naveen Singh Dhami, Bruno Gudac, Mario Novak, László Forró, Neven Barišic, Ivo Batistic, Petar PopčevicMon, 09 Ma🔬 cond-mat

On the Optimal Layout of Two-Dimensional Lattices for Density Matrix Renormalization Group

This paper proposes that finding a Hamiltonian path on a two-dimensional lattice that minimizes a specific geometric cost function yields an optimal site numbering for the Density Matrix Renormalization Group (DMRG) algorithm, thereby significantly improving its accuracy and convergence speed for various spin models.

A. ScardicchioMon, 09 Ma🔬 cond-mat

Universality in driven systems with a multiply-degenerate umbilic point

This paper investigates a multilane asymmetric exclusion process with a multiply-degenerate umbilic point, demonstrating through effective mode-coupling theory and simulations that the system exhibits a robust dynamical exponent of $z=3/2$ and novel universality classes for its space-time fluctuations.

Johannes Schmidt, Žiga Krajnik, Vladislav PopkovMon, 09 Ma🔬 cond-mat

Tethering effects on first-passage variables of lattice random walks in linear and quadratic focal point potentials

This paper bridges a gap in the literature by analyzing the dynamics of lattice random walks in linear (V-shaped) and quadratic (U-shaped) focal point potentials, revealing unique first-passage behaviors such as logarithmic growth of distinct sites visited, non-monotonic mean first-passage times dependent on bias strength, and the emergence of a motion-limited regime under resetting, which contrasts with continuous Brownian motion.

Debraj Das, Luca GiuggioliMon, 09 Ma🔬 cond-mat

Comparison of some geometric frameworks for dissipative evolution in multiscale non-equilibrium thermodynamics

This paper reviews and compares various geometric frameworks for modeling dissipative evolution in multiscale non-equilibrium thermodynamics, ranging from classical irreversible thermodynamics and gradient dynamics to Rayleigh dissipation potentials, the dissipative d'Alembert framework, and Poisson bracket-based approaches.

Miroslav Grmela, Michal PavelkaMon, 09 Ma🔬 cond-mat

Machine-learning-derived protocols for information-based work extraction from active particles

This paper proposes and analyzes a machine-learning-optimized protocol that extracts work exceeding the conventional second law limits from a single active particle in a harmonic potential by measuring the relative sign of self-propulsion and confining forces to dynamically adjust the potential's stiffness.

Grzegorz SzamelMon, 09 Ma🔬 cond-mat

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cond-mat

Persistent short-range charge correlations revealed by ultrafast melting of electronic order in YBa2_22​Cu3_33​O6+x_{6+x}6+x​