Odd transport in a two-temperature Brownian dimer
- 1Heinrich-Heine-Universität Düsseldorf
Abstract
We investigate a two-temperature Brownian dimer with odd mobility, characterized by an antisymmetric component of the transport response, as a controlled paradigm for odd nonequilibrium dynamics. Two confined Brownian particles are elastically coupled and connected to reservoirs at different temperatures, while odd mobility converts conservative forces into transverse motion. For the symmetric harmonic reference model we obtain the nonequilibrium steady state exactly. Odd mobility generates a handed transverse interparticle correlation while the one-particle distributions remain isotropic, and the correlation exists only when temperature imbalance, elastic coupling, and odd response act together. The steady probability current separates into an ordinary irreversible component and a chiral contribution which, upon marginalization, produces counter-rotating one-particle currents. We derive the corresponding heat transfer and entropy production and show that odd mobility enhances thermal conductance, whereas scalar thermodynamic observables are unchanged when the odd handedness is reversed. We further solve the harmonically confined dimer with unequal trap stiffnesses and find that moderate mechanical asymmetry can enhance the normalized transverse correlation while preserving counter-rotation. Finally, small-mass Langevin simulations with quartic confinement show that the transverse odd correlation and counter-rotating currents persist when the steady state becomes explicitly non-Gaussian.
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BibTeX
@article{abdoli2026transport,
title = {{Odd transport in a two-temperature Brownian dimer}},
author = {Iman Abdoli and Hartmut Löwen},
journal = {New Journal of Physics},
year = {2026},
month = nov,
doi = {10.1088/1367-2630/aebb5c},
url = {https://iopscience.iop.org/article/10.1088/1367-2630/aebb5c},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Odd transport in a two-temperature Brownian dimer
AU - Iman Abdoli
AU - Hartmut Löwen
PY - 2026
DA - 2026/11/06
JO - New Journal of Physics
DO - 10.1088/1367-2630/aebb5c
UR - https://iopscience.iop.org/article/10.1088/1367-2630/aebb5c
AB - We investigate a two-temperature Brownian dimer with odd mobility, characterized by an antisymmetric component of the transport response, as a controlled paradigm for odd nonequilibrium dynamics. Two confined Brownian particles are elastically coupled and connected to reservoirs at different temperatures, while odd mobility converts conservative forces into transverse motion. For the symmetric harmonic reference model we obtain the nonequilibrium steady state exactly. Odd mobility generates a handed transverse interparticle correlation while the one-particle distributions remain isotropic, and the correlation exists only when temperature imbalance, elastic coupling, and odd response act together. The steady probability current separates into an ordinary irreversible component and a chiral contribution which, upon marginalization, produces counter-rotating one-particle currents. We derive the corresponding heat transfer and entropy production and show that odd mobility enhances thermal conductance, whereas scalar thermodynamic observables are unchanged when the odd handedness is reversed. We further solve the harmonically confined dimer with unequal trap stiffnesses and find that moderate mechanical asymmetry can enhance the normalized transverse correlation while preserving counter-rotation. Finally, small-mass Langevin simulations with quartic confinement show that the transverse odd correlation and counter-rotating currents persist when the steady state becomes explicitly non-Gaussian.
SN - 1367-2630
ER -