Article
Physics, Fluids & Plasmas
Ritwick Sarkar, Ion Santra, Urna Basu
Summary: We study the stationary state of a chain of harmonic oscillators driven by two active reservoirs at the two ends. These reservoirs exert correlated stochastic forces on the boundary oscillators which eventually leads to a nonequilibrium stationary state of the system. The stationary velocity fluctuations are shown to be Gaussian in nature with a uniform kinetic temperature in the bulk, irrespective of the specific dynamics of the drive. Moreover, an equipartition of energy is found in the bulk of the system, where the bulk kinetic temperature equals the bulk potential temperature in the thermodynamic limit. The behavior of the oscillators near the boundary reveals the signatures of specific active driving, especially for the RTP and ABP-driven chains.
Article
Physics, Multidisciplinary
Ion Santra, Urna Basu
Summary: The transport properties of an extended system driven by active reservoirs have been explored for the first time in this study. Energy transport between two active reservoirs connected by a chain of harmonic oscillators was analyzed. The stochastic forces exerted by the active reservoirs on the boundary oscillators lead to fascinating behavior of the energy current and kinetic temperature profile. The results show that the stationary active current exhibits non-monotonic changes and a negative differential conductivity due to the Lorentzian frequency spectrum of the active reservoirs.
Article
Physics, Multidisciplinary
Da Ke, Wei Zhong, Sergey Dmitriev, Daxing Xiong
Summary: We have developed an effective numerical scheme to capture hydrodynamic modes in classical anharmonic chains. Our results show the limitations of the current theories and provide new insights into thermal transport.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Physics, Fluids & Plasmas
Na'im Kalantar, Bijay Kumar Agarwalla, Dvira Segal
Summary: The study demonstrates that perfectly harmonic junctions can rectify heat under asymmetric temperature gradients, leading to the temperature-gradient harmonic oscillator diode effect. This non-linear diode effect is due to the additional constraint of imposed thermal gradient at the boundaries.
Article
Physics, Fluids & Plasmas
Jithu Paul, O. Gendelman
Summary: The study focuses on Kapitza thermal resistance between homogeneous chain fragments with different characteristics. An exact expression for resistance is derived in the linear model. In cases of frequency mismatch between domains, Kapitza resistance is well defined in the thermodynamic limit, but in nonlinear chains, resistance exhibits different dependencies.
Article
Physics, Fluids & Plasmas
I. F. Herrera-Gonzalez, J. A. Mendez-Bermudez
Summary: We investigate the localization properties of normal modes in harmonic chains with weak disorder, including mass disorder correlations, spring disorder correlations, and mass-spring disorder correlations. We obtain an expression for the localization length valid for arbitrary disorder correlations and for the whole frequency band. Moreover, we show how to generate effective mobility edges using disorder with long range self-correlations and cross-correlations. Our results also reveal the presence of transparent windows in phonon transport that can be manipulated through disorder correlations even for short chain sizes. These findings have implications for heat conduction in harmonic chains and may find applications in modulating thermal transport and designing high-thermal-conductivity materials.
Article
Optics
F. Benatti, R. Floreanini, L. Memarzadeh
Summary: We study an open quantum spin chain with XX interactions and external magnetic field. We derive the open chain master equation using weak coupling limit techniques and study its dependence on the parameter r. By increasing r, the chain transitions exhibit negative frequencies and the dissipative time evolution shows discontinuous behavior. These features could be experimentally observed and can discriminate between global and local approaches to open quantum spin chains.
Article
Physics, Multidisciplinary
Jacopo De Nardis, Sarang Gopalakrishnan, Romain Vasseur, Brayden Ware
Summary: The paper discusses the phenomenon of superdiffusive finite-temperature transport observed in integrable systems with non-Abelian global symmetries, attributing it to giant Goldstone-like quasiparticles stabilized by integrability. It argues that these giant quasiparticles have long lifetimes and divergent contributions to the low-frequency conductivity, even in systems that are not perfectly integrable. The study finds that for certain types of perturbations, the conductivity behaves similar to omega(-1/3) for translation-invariant static perturbations and similar to |log omega| for noisy perturbations, with a presumed crossover to regular diffusion beyond low-order perturbation theory.
PHYSICAL REVIEW LETTERS
(2021)
Article
Thermodynamics
Jierong Liang, Marvin Masche, Kurt Engelbrecht, Christian R. H. Bahl
Summary: The design of thermal regenerators considers fundamental influencing variables and can be complicated by the nonlinearity of coupled phenomena in novel solid-state cooling systems using active caloric regenerators. Analytical expressions are derived to elucidate the operation of active regenerators with sinusoidal magnetic field and fluid flow boundary conditions, and validation is done with an internal temperature measurement system. The derived expressions show acceptable accuracy compared to experimental and numerical results, with average and maximum errors of approximately 10% and 15% respectively, and provide useful figures of merit for temperature profiles.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Materials Science, Multidisciplinary
Cristian Zanoci, Brian Swingle
Summary: The study investigates the temperature dependence of energy diffusion in two chaotic gapped quantum spin chains using an open-system approach, introducing energy imbalance by coupling the chains to thermal baths. It compares local reduced density matrices to define an effective local temperature profile and measures energy current for various driving temperatures. The Ising model reveals dilute excitations controlling energy diffusion at low temperatures, while the XZ model data can be described by an expansion around the infinite temperature limit.
Article
Mechanics
Vir B. Bulchandani, Sarang Gopalakrishnan, Enej Ilievski
Summary: This review summarizes recent advances in understanding anomalous transport in spin chains, particularly through the lens of integrability. Numerical methods based on tensor-network techniques have revealed anomalous transport in many canonical integrable spin chains, such as the Heisenberg model. The framework of generalized hydrodynamics has been extended to explain some of the underlying mechanisms of anomalous transport, with discussions on similarities and differences with other contexts. Further, potential transport anomalies in systems with emergent or approximate integrability are briefly reviewed, with ongoing research on anomalous transport and dynamics.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2021)
Article
Materials Science, Multidisciplinary
P. D. Sacramento, M. F. Madeira
Summary: We investigate the influence of topological phases on spin density and spin polarization through a chiral chain. It is found that the quantization of Berry phase leads to the quantization of polar angle in momentum space spin density in a one-dimensional polarization helix structure under an external magnetic field.
Article
Materials Science, Multidisciplinary
Gabriel T. Landi
Summary: The study focuses on the waiting time distributions of quantum chains coupled to Lindblad baths at each end. Closed-form expressions in terms of single-particle matrices are derived for free fermion chains, allowing the study of arbitrarily large chain sizes, along with formulas for 2-point correlation functions involving non-Hermitian propagators.
Article
Chemistry, Physical
Frederik H. van Veen, Luca Ornago, Herre S. J. van der Zant, Maria El Abbassi
Summary: This study investigates the variation in conductance values of alkanes using the mechanically controlled break junction technique. By analyzing the time evolution and distance dependence of the measured traces, the single-molecule conductance values for fully stretched molecular configurations are determined. The results provide crucial information for determining the molecular junction configuration.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Abdalghani Daaoub, Colin J. Lambert, Hatef Sadeghi
Summary: The study investigated the electronic and spintronic properties of subnanometer graphene junctions bridged by carbon chains, categorizing them based on their qualitative transport properties. Findings included the influence of even versus odd-numbered carbon chain bridges on conductance, as well as the impact of ferromagnetic alignment on transmission rates. Additionally, the study explored the effects of terminal rings, electrode edges, and hydrogen saturation on the transport properties of these structures, providing valuable insights for spintronic applications.
Article
Physics, Multidisciplinary
Szabolcs Vajna, Katja Klobas, Tomaz Prosen, Anatoli Polkovnikov
PHYSICAL REVIEW LETTERS
(2018)
Article
Physics, Multidisciplinary
Matthieu Vanicat, Lenart Zadnik, Tomaz Prosen
PHYSICAL REVIEW LETTERS
(2018)
Article
Physics, Multidisciplinary
Pavel Kos, Marko Ljubotina, Tomaz Prosen
Article
Physics, Multidisciplinary
Berislav Buca, Tomaz Prosen
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2018)
Article
Mechanics
Katja Klobas, Marko Medenjak, Tomaz Prosen
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2018)
Article
Physics, Multidisciplinary
Enej Ilievski, Jacopo De Nardis, Marko Medenjak, Tomaz Prosen
PHYSICAL REVIEW LETTERS
(2018)
Article
Physics, Multidisciplinary
Bruno Bertini, Pavel Kos, Tomaz Prosen
PHYSICAL REVIEW LETTERS
(2018)
Article
Physics, Multidisciplinary
Pedro Ribeiro, Tomaz Prosen
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Multidisciplinary
George Datseris, Theo Geisel, Ragnar Fleischmann
NEW JOURNAL OF PHYSICS
(2019)
Article
Physics, Multidisciplinary
Gerrit Green, Ragnar Fleischmann
NEW JOURNAL OF PHYSICS
(2019)
Article
Mathematics, Applied
George Datseris, Lukas Hupe, Ragnar Fleischmann
Review
Physics, Multidisciplinary
B. Bertini, F. Heidrich-Meisner, C. Karrasch, T. Prosen, R. Steinigeweg, M. Znidaric
Summary: Significant progress has been made in the theoretical understanding of transport properties in one-dimensional quantum lattice systems in the past decade, with Bethe-ansatz integrable models and novel simulation methods playing important roles. The discovery of quasilocal conserved quantities provides insight into the origins of finite-temperature transport behavior, while state-of-the-art theoretical methods, including matrix-product-state-based simulation and generalized hydrodynamics, are discussed. The close connection between theoretical models and recent experiments, particularly in the context of quantum magnets and ultracold quantum gases in optical lattices, is also highlighted.
REVIEWS OF MODERN PHYSICS
(2021)
Article
Physics, Multidisciplinary
Eric J. Heller, Ragnar Fleischmann, Tobias Kramer
Summary: Branched flow is a beautiful and relatively neglected regime in many kinds of irregular media, affecting sound, light, water, and matter waves over vastly different length scales.
Article
Physics, Multidisciplinary
Tomaz Prosen
Summary: We propose and discuss two variants of cellular automata models that describe the behavior of particles in 1 + 1 dimensions. The first model describes two types of quasiparticles, while the second model represents a quantum deformation of a previously studied lattice gas model. Both models exhibit intriguing properties and may have potential applications in further research.
Article
Physics, Multidisciplinary
George Datseris, Ragnar Fleischmann
JOURNAL OF PHYSICS COMMUNICATIONS
(2020)
