\/svg>","ionicons-filled--link":"<\/svg>"}) Accessibility Tools Invert colors Monochrome Dark contrast Light contrast Low saturation High saturation Highlight links Highlight headings Screen reader Read mode Content scaling 100% Font size 100% Line height 100% Letter spacing 100% Skip to main content PL The Institute The Institute General information Emploees News Scientific News Gender equality plan Address and contact data Research Research profile List of publications Information in BIP Scientific Council Organizational structure GDPR Events Seminars Current seminars List of seminars Conferences Current conferences Past conferences For students Doctoral school General Information Curriculum Recruitment School Council Doctoral Student Council Teaching Doctoral students Mid-term evaluation For students Master theses Student training Visiting the Institute For employees Institute e-mail Eduroam Publication registry Contact us Address and contact data Important phone numbers and emails PL The Institute The Institute General information Emploees News Scientific News Gender equality plan Address and contact data Research Research profile List of publications Information in BIP Scientific Council Organizational structure GDPR Events Seminars Current seminars List of seminars Conferences Current conferences Past conferences For students Doctoral school General Information Curriculum Recruitment School Council Doctoral Student Council Teaching Doctoral students Mid-term evaluation For students Master theses Student training Visiting the Institute For employees Institute e-mail Eduroam Publication registry Contact us Address and contact data Important phone numbers and emails Events Home Events List of seminars Seminar of Physics of Wrocław University of Technology 11:15, 25-06-02 PWr, bud. A1, sala 322 How closed quantum systems forget, and when they rememberdr inż. Patrycja ŁydżbaInstytut Fizyki Teoretycznej, Politechnika WrocławskaI discuss the thermalization of closed quantum systems. This refers to their ability to relax toward steady states described by only a few quantities, such as mean energy or particle number. I introduce the eigenstate thermalization hypothesis, which underpins our current understanding of this process. I then present notable exceptions to thermalization, focusing on Hilbert space fragmentation, where the Hamiltonian breaks into exponentially many (in system size) dynamically disconnected blocks. In the final part, I show that a suitably chosen perturbation can induce a gradual merging of these fragmented subspaces. This slow restoration of ergodicity gives rise to an extended critical regime, marked by multiple peaks in the fidelity susceptibility. Each peak signals a change in the number of blocks and corresponds to ultra-slow relaxation of local observables.
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I discuss the thermalization of closed quantum systems. This refers to their ability to relax toward steady states described by only a few quantities, such as mean energy or particle number. I introduce the eigenstate thermalization hypothesis, which underpins our current understanding of this process. I then present notable exceptions to thermalization, focusing on Hilbert space fragmentation, where the Hamiltonian breaks into exponentially many (in system size) dynamically disconnected blocks. In the final part, I show that a suitably chosen perturbation can induce a gradual merging of these fragmented subspaces. This slow restoration of ergodicity gives rise to an extended critical regime, marked by multiple peaks in the fidelity susceptibility. Each peak signals a change in the number of blocks and corresponds to ultra-slow relaxation of local observables.