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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif">Please join us for a CMT Seminar presented by Gang Chen, next Monday, February 6th at 11:30am in 1080 Smith Seminar Room<o:p></o:p></span></p>
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<p class="Default"><span style="font-size:14.0pt">Title: “Monopole Condensation" Transition out U(1)
</span><span style="font-size:14.0pt;color:windowtext">Quantum Spin Liquid: Application to Pr2Ir2O7 ”
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<p class="Default"><span style="font-size:14.0pt">Abstract: We study the proximate magnetic orders and the related quantum phase transition out of U(1) quantum spin liquid. We apply the electromagnetic duality of the compact quantum electrodynamics to analyze
the condensation of the "magnetic monopoles" for U(1) quantum spin liquid. The monopole condensation transition represents a unconventional quantum criticality with unusual scaling laws. The magnetic monopole condensation leads to the magnetic states that
belong to the “2-in 2-out” spin ice manifold and generically have an enlarged magnetic unit cell. We demonstrate that the antiferromagnetic state with the ordering wavevector Q = 2pi (001) is proximate to U(1) quantum spin liquid while the ferromagnetic state
with the ordering wavevector Q = (000) is not proximate to quantum spin liquid. This implies that if there exists a direct transition from U(1) quantum spin liquid to the ferromagnetic state, the transition must be strongly first order. We apply the theory
to the puzzling experiments on two pyrochlore systems Pr2Ir2O7. </span><span style="mso-contextual-alternates:yes"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:black;mso-contextual-alternates:yes">Host: Yuan-Ming Lu, Ph.D.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Times New Roman",serif">Thank you,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Times New Roman",serif">Eric<o:p></o:p></span></p>
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