# 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.

## Programmable Matter: The Shape of Things to Come

Sunday Sep 18, 2011
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Learn about the future of â3D Printersâ â machines that will fabricate arbitrary-shaped parts, layer by layer. Dr. Lipson will share a history of these technologies and preview a future in which we continue to gain unprecedented control over physical matter. If humans distinguish themselves from their evolutionary ancestors by making tools, then how might the ultimate tools â involving additive manufacturing â impact human culture forever? Dr. Lipson explores the science, technology and potential of programmable matter.

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## Origins of the Digital Universe

Sunday Sep 18, 2011
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Some numbers mean things, and some numbers do things. Making--and breaking--that distinction was central to renowned mathematician John von Neumannâs implementation of Alan Turingâs Universal Machine in 1945-56. In this lecture, you will learn about the unlikeliest place on earth to build such a device and how this vital 5-kilobyte step in the digital revolution was sparked by a collision of ideas between mathematicians and engineers.

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## Stephen Hawking: The Power of Ideas

Saturday Sep 17, 2011
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## 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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## Next Public Lecture

### ROB MOORE: A MATERIAL WORLD: BUILDING A FUTURE FROM THE ATOMS UP

Wednesday Feb 07, 2018

## RECENT PUBLIC LECTURE

### Pauline Gagnon: Improbable Feats and Useless Discoveries

Speaker: Pauline Gagnon