Spin and thermal current scaling at a -junction of XX spin chains
arXiv:2508.10267 · doi:10.1103/9pvr-329m
Abstract
We study the boundary phase diagram and the low-temperature heat and magnetization transport at a -junction of XX spin chains. Depending on the magnetization axis anisotropy between the magnetic exchange interactions at the junction, the system exhibits two different strong-coupling regimes at low energies/temperatures, similar to the overscreened (topological) four- and to the two-channel Kondo fixed points. Using renormalization group arguments combined with boundary conformal field theory methods, we show the instability of the former under any XY-type anisotropy at the junction. We analyze the low-temperature spin and the heat conductances. We find evidence of spin fractionalization of the elementary excitations at the four-channel Kondo fixed point by means of the magnetic Wiedemann-Franz law. We caution that the instability under XY anisotropy may hinder the detection of the phenomenology related to the four-channel Kondo effect, therefore requiring careful control in experimental realizations.
arXiv comment21 pages, 4 .eps figures. v2: expanded discussions about RG flow, fixed points, realizations of anisotropic chains; references added. Accepted version
References in corpus (81)
- Circuit Quantum Electrodynamics
- Spin Caloritronics
- Luttinger Liquid Behavior in Carbon Nanotubes
- Many-Body Physics with Individually-Controlled Rydberg Atoms
- A toolbox for lattice spin models with polar molecules
- Realizing a lattice spin model with polar molecules
- Effective quantum spin systems with ion traps
- Transport and conservation laws
- Open XXZ spin chain: Nonequilibrium steady state and strict bound on ballistic transport
- Anomalous heat conduction in one dimensional momentum-conserving systems
- Coherent Excitation Transfer in a Spin Chain of Three Rydberg Atoms
- Spin transport in a tunable Heisenberg model realized with ultracold atoms
- Topological Kondo effect with Majorana fermions
- Heat transport by lattice and spin excitations in the spin chain compounds SrCuO_2 and Sr_2CuO_3
- Electronic transport properties of graphene nanoribbons
- Quantum Magnetism with Polar Alkali Dimers
- Observation of spin current in quantum spin liquid
- The thermodynamic cost of driving quantum systems by their boundaries
- Universal transport signatures of Majorana fermions in superconductor-Luttinger liquid junctions
- Junctions of three quantum wires
- Atomic spin chain realization of a model for quantum criticality
- Junctions of three quantum wires and the dissipative Hofstadter model
- Thermal conductivity and specific heat of the linear chain cuprate SrCuO: Evidence for thermal transport via spinons
- Pedestrian Approach to the Two-Channel Kondo Model
- Dynamical Control of Quantum Heat Engines Using Exceptional Points
- Multi-Terminal Coulomb-Majorana Junction
- Quantum spin transistor with a Heisenberg spin chain
- Finite-range interacting Ising quantum magnets with Rydberg atoms in optical lattices - From Rydberg superatoms to crystallization
- Thermal Conductivity of Spin-1/2 Chains
- Multi-channel Kondo impurity dynamics in a Majorana device
- Realization of 2-channel Kondo effect in a junction of three quantum Ising chains
- Energy dynamics, heat production and heat-work conversion with qubits: towards the development of quantum machines
- Spin Currents and Magnon Dynamics in Insulating Magnets
- Quantum Fields on Star Graphs
- Dynamics of one-dimensional Bose liquids: Andreev-like reflection at Y-junctions and absence of the Aharonov-Bohm effect
- Quantum spins on star graphs and the Kondo model
- Junctions of three quantum wires for spin 1/2 electrons
- Topological Superconductor-Luttinger Liquid Junctions
- Thermal conductivity of quasi-one-dimensional antiferromagnetic spin-chain materials
- Wiedemann-Franz Law for Magnon Transport
- Transport and dynamics on open quantum graphs
- Spintronic thermal management
- Dissipation, Correlation and Lags in Heat Engines
- Frustration of decoherence in -shaped superconducting Josephson networks
- Kondo Effect in Spin Chains
- Non-equilibrium Steady States of Quantum Systems on Star Graphs
- Violation of the Wiedemann-Franz law in the Topological Kondo model
- Dissipative Spin-wave Diode and Nonreciprocal Magnonic Amplifier
- Tunneling spectroscopy of Majorana-Kondo devices
- Electron Teleportation in Multi-Terminal Majorana Islands: Statistical Transmutation and Fractional Quantum Conductance
- From four- to two-channel Kondo effect in junctions of XY spin chains
- Competing Boundary Interactions in a Josephson Junction Network with an Impurity
- Thermodynamics of the Topological Kondo Model
- Holographic optical traps for atom-based topological Kondo devices
- Screening Clouds and Majorana Fermions
- Enhanced Coherence of a Quantum Doublet Coupled to Tomonaga-Luttinger Liquid Leads
- Pairing of Cooper pairs in a Josephson junction network containing an impurity
- Heat Transport in Spin Chains with Weak Spin-Phonon Coupling
- Railway switch transport model
- Tunable self-assembled spin chains of strongly interacting cold atoms
- Multi-particle scattering and breakdown of the Wiedemann-Franz law at a junction of N interacting quantum wires
- Topological Kondo effect in star junctions of Ising magnetic chains. Exact solution
- Realization of a two-channel Kondo model with Josephson junction networks
- Tunable spin/charge Kondo effect at a double superconducting island connected to two spinless quantum wires
- Tunable Kondo screening length at a Y-junction of three inhomogenous spin chains
- Designing Robust Quantum Refrigerators in Disordered Spin Models
- Josephson effect in Majorana box devices
- Junction of three off-critical quantum Ising chains and two-channel Kondo effect in a superconductor
- Chiral Y junction of quantum spin chains
- Dual fermionic variables and renormalization group approach to junctions of strongly interacting quantum wires
- Chiral quantum heating and cooling with an optically controlled ion
- Probing Majorana zero modes by measuring transport through an interacting magnetic impurity
- Quantum spin circulator in Y junctions of Heisenberg chains
- A possible realization of multi-channel Kondo model in a system of magnetic chains
- Phonon-induced magnetoresistivity of Weyl semimetal nanowires
- Real fermion modes, impurity entropy, and nontrivial fixed points in the phase diagram of junctions of interacting quantum wires and topological superconductors
- From Kondo effect to weak-link regime in quantum spin-1/2 spin chains
- Observation of anisotropy-independent magnetization dynamics in spatially disordered Heisenberg spin systems
- Energy transmutation in nonequilibrium quantum systems
- The topological Kondo model out of equilibrium
- Giant caloric effects in spin chain materials