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Condensed Matter Physics Seminar - Teemu Ojanen

Science and Information Technology

This is part of a virtual seminar series in theoretical condensed matter and atomic physics, with the aim to connect researchers working at different Nordic universities. This seminar by Teemu Ojanen from Tampere University is titled "Solving dynamical quantum phase transition in strongly correlated systems by Loschmidt cumulants".

Seminar
Date
29 Nov 2021
Time
16:15 - 17:15
Location
Digitally via Zoom

Teemu Ojanen: Solving dynamical quantum phase transition in strongly correlated systems by Loschmidt cumulants

Abstract

Dynamical quantum phase transitions, defined in terms of the many-body Loschmidt echo, generalize the notion of phase transitions and criticality to many-body systems far from equilibrium. This rapidly advancing research field is bringing together themes from statistical physics, topological matter and strongly correlated systems. However, solving the dynamics of strongly interacting quantum systems is a notoriously difficult problem, which is hindering the progress in the field. To circumvent this impasse, I introduce a novel method to determine the singular dynamics by employing so-called Loschmidt cumulants[1]. I will demonstrate the remarkable power of the new method by solving dynamical phase transitions in interacting Kitaev chain and spin-1 Heisenberg chain.

[1] S. Peotta, F. Brange, A. Deger, T. Ojanen and, C. Flindt, Physical Review X 11, 041018 (2021).

The seminar is held digitally via Zoom

Zoom-link: https://nordita.org/zoom/nvcms

Read more about the seminar series

Condensed Matter Physics Seminar