Joint ICTP/SISSA Condensed Matter Seminar IN PERSON, 29 November at 11:30am, Marko Znidaric

[CMSP Seminars Secretariat]

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  Joint ICTP/SISSA Condensed Matter Seminar
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** * * Tuesday**, 29 November 2022, 11:30**am * * **
In person: *Luigi Stasi Seminar Room
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/Zoom: 
//https://zoom.us/meeting/register/tJAqceGsqzssE9zHrcmx1R6R9eHnspriTLn8/
<https://zoom.us/meeting/register/tJAqceGsqzssE9zHrcmx1R6R9eHnspriTLn8>

Speaker: *Marko Znidaric *(University of Ljubljana)

Title: *Two-step relaxation in many-body systems

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Abstract:
Describing full unitary dynamics of a many-body system is difficult and 
also unpractical. Focusing on a coarse-grained dynamics or few select 
observables often results in a more compact non-unitary evolution. 
Studying bipartite entanglement dynamics in random circuits one can 
derive a Markovian transfer matrix description that harbors rather 
intriguing many-body non-Hermitian physics. The speed of generating 
entanglement is not given by the 2nd largest eigenvalue of the transfer 
matrix, but rather by a phantom eigenvalue -- an eigenvalue that is not 
in the spectrum of any finite transfer matrix. Resolution of this 
paradox will lead to a pseudospectrum and a realization that, when 
dealing with finite non-Hermitian matrices it can be that being exact is 
actually wrong, while being slightly wrong is correct.

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