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# Vidéotheque

Since 2002 Perimeter Institute has been recording seminars, conference talks, public outreach events such as talks from top scientists using video cameras installed in our lecture theatres.  Perimeter now has 7 formal presentation spaces for its many scientific conferences, seminars, workshops and educational outreach activities, all with advanced audio-visual technical capabilities.

Recordings of events in these areas are all available and On-Demand from this Video Library and on Perimeter Institute Recorded Seminar Archive (PIRSA)PIRSA is a permanent, free, searchable, and citable archive of recorded seminars from relevant bodies in physics. This resource has been partially modelled after Cornell University's arXiv.org.

Accessibly by anyone with internet, Perimeter aims to share the power and wonder of science with this free library.

## Dynamics of two-point correlation functions in quantum systems

Vendredi avr 26, 2019
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We give rigorous analytical results on the temporal behavior of two-point correlation functions (also known as dynamical response functions or Green’s functions) in quantum many body systems undergoing unitary dynamics. Using recent results from large deviation theory, we show that in a large class of models the correlation functions factorize at late times -> , thus proving that dissipation emerges out of the unitary dynamics of the system.

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## Delocalized quantum clocks and relativistic time dilation

Jeudi avr 25, 2019
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The theory of relativity associates a proper time with each moving object via its spacetime trajectory. In quantum theory on the other hand, such trajectories are forbidden. I will discuss an operation approach to exploring this conflict, considering the average time measured by a quantum clock in the weak-field, low-velocity limit. Considering the role of the clock’s state of motion, one finds that all good'' quantum clocks experience the time dilation prescribed by general relativity for the most classical states of motion.

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## PSI 2018/2019 - Explorations in Cosmology - Lecture 8

Jeudi avr 25, 2019
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## From translation symmetry-enriched topological order to fracton phases

Jeudi avr 25, 2019
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## PSI 2018/2019 - Explorations in Quantum Information - Lecture 8

Jeudi avr 25, 2019

## Spontaneous symmetry breaking from anyon condensation

Mercredi avr 24, 2019
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In the context of quantum spin liquids, it is long known that the condensation of fractionalized excitations will inevitably break certain physical symmetries sometimes. For example, condensing spinons will usually break spin rotation and time reversal symmetries. We generalize these phenomena to generic continuous quantum phase transitions between symmetry enriched topological orders driven by anyon condensation. We provide a generic rule to determine whether a symmetry is enforced to break across an anyon condensation transition.

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## When topology meets strong interactions in quantum matter

Mercredi avr 24, 2019
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The study of strongly  interacting quantum matter has been at the forefront of condensed matter research in the last several decades. An independent development is the discovery of topological band insulators.  In this talk I will  describe phenomena that occur at the confluence of topology and strong interactions.

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## Bridging partons and coupled-wire approaches to strongly entangled quantum matter

Mercredi avr 24, 2019
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The Hallmark of strongly entangled quantum phases is an intrinsic impossibility to describe them locally in terms of microscopic degrees of freedom. Two popular methods that have been developed to analytically describe these exotic states are known as (1) ‘parton construction’ and (2) ‘coupled-wire approach’. The former provides a constructive route for determining which non-trivial phases may arise, in principle, for a given set of constituent degrees of freedom and symmetries.

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## PSI 2018/2019 - Explorations in Cosmology - Lecture 7

Mercredi avr 24, 2019
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## Field-induced neutral Fermi surfaces and QCD3 quantum criticalities

Mercredi avr 24, 2019
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We perform both numerical and theoretical studies on the phase diagram of the Kitaev materials in the presence of a magnetic field. We find that a new quantum spin liquid state with neutral Fermi surfaces emerges at intermediate field strengths, between the regimes for the non-Abelian chiral spin liquid state and for the trivial polarized state. We discuss the exotic field-induced quantum phase transitions from this new state with neutral Fermi surfaces to its nearby phases.

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## Next Public Lecture

### ANNE ANDREWS AND PAUL WEISS, UNIVERSITY OF CALIFORNIA, LOS ANGELES

Mercredi mai 01, 2019