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						<h1 itemprop="headline">General Physics Colloquium - Anne E. Nielsen: &#039;Fractional quantum Hall physics and topology in lattice systems&#039;</h1>
						
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														Wednesday 19  November 2014,
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														&nbsp;at 15:15 -  16:00
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<h2>General Physics Colloquium</h2>
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<p>'Fractional quantum Hall physics and topology in lattice systems'
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<p>&nbsp;
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<p>Anne E. Nielsen
</p>
<p>MPI-Quantenoptik, Garching, Germany
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<p>&nbsp;
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<p>The discovery of the fractional quantum Hall effect in the early&nbsp; eighties revealed the physical existence of phases of matter that&nbsp; differ fundamentally from previously known phases, and these phases&nbsp; are still under intense investigations today. The property that makes&nbsp; them special is that they are topological. Topology is the study of&nbsp; quantities that do not change when a geometrical object is deformed&nbsp; smoothly. Examples include the twist of a Möbius strip and the hole&nbsp; through a torus.
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<p>One way that topology can appear in two-dimensional quantum many-body&nbsp; systems is through the existence of anyons. Anyons are localized&nbsp; excitations that look like particles, but nevertheless have&nbsp; properties that normal, isolated particles cannot have. Anyons are&nbsp; interesting from a fundamental point of view and also for, e.g.,&nbsp; quantum computation.
</p>
<p>In recent years, there has been a lot of effort towards clarifying&nbsp; under which conditions the fractional quantum Hall effect can occur.
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<p>One motivation for this is the hope to find easier and more robust&nbsp; ways to realize the effect experimentally.
</p>
<p>In this talk, I will first give an introduction to topology and the&nbsp; fractional quantum Hall effect. I will then discuss some recent&nbsp; proposals for engineering fractional quantum Hall physics under new&nbsp; conditions.
</p>
<p>&nbsp;<img height="196" src="fileadmin/_migrated/RTE/RTEmagicC_LatticeAnyons.jpg.jpg" data-htmlarea-file-uid="14755" data-htmlarea-file-table="sys_file" width="400" alt>
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<p><em>Wine and cheese will be served at 4 PM</em></p>
								
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