<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="Generator" content="Microsoft Word 14 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Georgia;
panose-1:2 4 5 2 5 4 5 2 3 3;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
pre
{mso-style-priority:99;
mso-style-link:"HTML Preformatted Char";
margin:0in;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.HTMLPreformattedChar
{mso-style-name:"HTML Preformatted Char";
mso-style-priority:99;
mso-style-link:"HTML Preformatted";
font-family:"Courier New";}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-US" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-family:"Georgia","serif"">Please join us TODAY, Monday, April 13<sup>th</sup> for the Condensed Matter Theory Seminar presented by Alex Kamenev, University of Minnesota at 11:30am in the Smith Seminar Room.<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<pre style="margin-right:27.0pt"><b><i><span style="font-size:11.0pt;font-family:"Georgia","serif"">“Quantum criticality of 1D topological Anderson insulators”<o:p></o:p></span></i></b></pre>
<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-right:.5in;mso-margin-bottom-alt:auto">
<b><span style="font-family:"Georgia","serif"">Abstract</span></b><span style="font-family:"Georgia","serif"">: I will talk about recent analytical understanding of quantum criticality in quasi one-dimensional topological Anderson insulators. We describe these
systems in terms of two-parameter effective theory representing localization and topological properties, respectively.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia","serif"">Certain critical values of the second parameter define phase boundaries between distinct topological sectors. Upon increasing system size, the two parameters exhibit flow similar to the celebrated
two parameter flow of the integer quantum Hall insulator. However, unlike the quantum Hall system, an exact analytical description of the entire phase diagram can be given in terms of the transfer-matrix solution of corresponding supersymmetric non-linear
sigma-models. In Z2 classes we uncover a hidden supersymmetry, present at the quantum critical point.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia","serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia","serif"">Thank you,<br>
Trisch<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia","serif"">2-2778<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</body>
</html>