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<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Georgia","serif"">Please join us for the CMT Seminar presented by Thomas Vojta from the University of Missouri on Monday, October 4<sup>th</sup> at 11:30am in the Smith Seminar room.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia","serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Georgia","serif"">Title:</span></b><span style="font-size:12.0pt;font-family:"Georgia","serif"">
<b>"Quantum phase transitions and disorder: from Harris criterion to infinite randomness and smearing"<o:p></o:p></b></span></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Georgia","serif"">Abstract:</span></b><span style="font-size:12.0pt;font-family:"Georgia","serif""> Phase transitions are fascinating phenomena in nature with consequences ranging from the
large scale structure of the universe to exotic quantum phases at low temperatures. Many realistic systems contain impurities, defects and other forms of quenched disorder. This talk explores the consequences of such randomness on the properties of phase transitions.
At zero-temperature quantum phase transitions, randomness can have particularly peculiar and strong effects. Often, rare strong disorder fluctuations and the rare spatial regions that support them dominate the physics close to the transition. They give rise
to strong singularities in the free energy, the so-called quantum- Griffiths singularities. In some systems such as metallic magnets, the effects of rare fluctuations can be even stronger, leading to a destruction of the phase transition by smearing. We
suggest a classification of these rare region effects based on the effective dimensionality of the defects, and we illustrate it using examples from classical, quantum, and nonequilibrium phase transitions.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Georgia","serif"">Thank you,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia","serif"">Trisch<o:p></o:p></span></p>
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