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# Video Library

Since 2002 Perimeter Institute has been recording seminars, conference talks, and public outreach events 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 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.

## Entanglement Spectra and Trace Index of Topological Insulators

Friday Sep 16, 2011
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We investigate the entanglement spectra of topological insulators which have gapless edge states on their spatial boundaries. In the physical energy spectrum, a subset of the edge states that intersect the Fermi level translates to discontinuities in the trace of the single-particle entanglement spectrum, which we call a trace index'. We find that any free-fermion topological insulator that exhibits spectral flow has a non-vanishing trace index, which provides us with a new description of topological invariants.

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## Quantum Theory - Lecture 5

Friday Sep 16, 2011
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## Relativity - Lecture 5

Friday Sep 16, 2011
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## Quantum Theory - Lecture 4

Thursday Sep 15, 2011
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## Relativity - Lecture 4

Thursday Sep 15, 2011
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## Building Fractional Topological Insulators

Wednesday Sep 14, 2011
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Time-reversal invariant band insulators can be separated into two categories: ordinary' insulators and `topological' insulators. Topological band insulators have low-energy edge modes that cannot be gapped without violating time-reversal symmetry, while ordinary insulators do not. A natural question is whether more exotic time-reversal invariant insulators (insulators not connected adiabatically to band insulators) can also exhibit time-reversal protected edge modes.

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## Quantum Theory - Lecture 3

Wednesday Sep 14, 2011
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## A Natural Language for AdS/CFT Correlators

Wednesday Sep 14, 2011
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TBA

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## Relativity - Lecture 3

Wednesday Sep 14, 2011
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## Quantum Theory - Lecture 2

Tuesday Sep 13, 2011
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## Next Public Lecture

### ERIK VERLINDE: A NEW VIEW ON GRAVITY AND THE DARK SIDE OF THE COSMOS

Wednesday Oct 04, 2017