Non-equilibrium noise at zero average current in quantum conductors

TKM Institutsseminar


Christian Spånslätt


02/11/2023 14:00


10.01, Geb. 30.23, CS; and Zoom


Chalmers University of Technology


Alexander Mirlin


Excess charge noise generated by only a temperature bias has been dubbed delta-T noise and has recently emerged as a novel transport spectroscopy tool for quantum conductors.

In this talk, I will first discuss delta-T noise for non-interacting systems and demonstrate that it belongs to a more generic class of “non-equilibrium noise at zero average current” [1]. I will show that both spin and charge current noises become bounded when the corresponding average currents are zero. However, the heat current noise at zero average heat current is not bounded, which has interesting implications for thermoelectrical applications.

I will then move on to discuss recent work that extends “non-equilibrium noise at zero average current” to strongly correlated, one dimensional conductors [2,3]. In particular, I will discuss how delta-T noise can be used to infer scaling dimensions of exotic quasiparticles (e.g., anyons) in weak tunneling setups.

[1] L. Tesser, M. Acciai, C. Spånslätt, J. Monsel, J. Splettstoesser: Phys. Rev. B 107, 075409 (2023)
[2] G. Zhang, I. V. Gornyi, C. Spånslätt: Phys. Rev. B 105, 195423 (2022)
[3] M. Acciai, G. Zhang, C. Spånslätt, in preparation