Condensed Matter Seminar: Ultracold quantum wires with localized losses: many-body quantum Zeno effect

Alessio Chiocchetta (University of Cologne)
I present a study of a one-dimensional system of interacting spinless fermions subject to a localized loss, where the interplay of gapless quantum fluctuations and particle interactions leads to an incarnation of the quantum Zeno effect of genuine many-body nature.

Alessio Chiocchetta (University of Cologne)
Online Seminar
Mon 20. April 2020, 11:30 am (MEZ)

Abstract:

I present a study of a one-dimensional system of interacting spinless fermions subject to a localized loss, where the interplay of gapless quantum fluctuations and particle interactions leads to an incarnation of the quantum Zeno effect of genuine many-body nature. This model constitutes a non-equilibrium counterpart of the paradigmatic Kane-Fisher potential barrier problem, and it exhibits strong interaction effects due to the Luttinger nature of the system. The loss probability is strongly renormalized near the Fermi momentum as a realization of the quantum Zeno effect, resulting in a suppression of the emission of particles at the Fermi level. This is reflected in the structure of the particle momentum distribution, exhibiting a peak close to the Fermi momentum.

Finally, I will present novel results about the non-equilibrium transport across these wires, showing that the dissipative nature of the impurity strongly modifies the usual transport properties of Luttinger liquids.

References

[1] Phys. Rev. Lett. 122, 040402 (2019)
[2] Phys. Rev. B 101, 144301 (2020)