סמינר בכימיה פיזיקלית: Unusual transport in odd-diffusive systems

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Abstract:

Odd systems, characterized by broken time-reversal or parity symmetry, exhibit striking transport phenomena due to transverse responses.

In this talk, I will introduce the concept of odd diffusion, a generalisation of diffusion in two-dimensional systems that incorporates antisymmetric tensor components. Focusing on systems of interacting particles, I present analytical results on effective transport coefficients and show how oddness in interacting systems gives rise to unusual transport.

I present effects like enhanced self-diffusion, reversed Hall drift, and even absolute negative mobility that solely originate in odd diffusion.

These results reveal how microscopic symmetry-breaking, encoded in unusual autocorrelation functions, gives rise to emergent equilibrium and non-equilibrium transport with implications for soft matter, chiral active systems, and topological materials.

References:

[1] Kalz, E., Vuijk, H. D., Abdoli, I., Sommer, J.-U., Löwen, H., & Sharma A. Collisions enhance self-diffusion in odd-diffusive systems. Phys. Rev. Lett. 129 (9), 2022.

[2] Kalz, E., Vuijk, H. D., Sommer, J.-U., Metzler, R., & Sharma, A. Oscillatory force autocorrelations in equilibrium odd-diffusive systems. Phys. Rev. Lett. 132 (5), 2024.

[3] Langer, A., Sharma, A. Metzler, R., & Kalz, E., Dance of odd-diffusive particles: A Fourier approach. Phys. Rev. Res. 6(4), 2024. 

[4] Kalz, E., Ravichandir, S., Birkenmeier, J., Metzler, R., & Sharma, A. Reversal of tracer advection and Hall drift in an interacting chiral fluid. arXiv:2503.04544, 2025.

מארגן הסמינר: פרופ' איליה קמינקר