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<td>CHARLA IFLYSIB: martes 22/3 - 10:30 hs - A new type of non-Fermi-liquid near the ferromagnetic transition in a 2D metal</td>
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<td>2016-03-17 10:08</td>
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<tr><th align="right" valign="baseline" nowrap="nowrap">Remitente:</th>
<td>Charlas Iflysib <charlas.iflysib@gmail.com></td>
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<td>academic@fcaglp.unlp.edu.ar, fcnym@museo.fcnym.unlp.edu.ar, info@ciop.unlp.edu.ar, internet@biol.unlp.edu.ar, scyt@frlp.utn.edu.ar, secre2@fisica.unlp.edu.ar, secre@biol.unlp.edu.ar, secre@mate.unlp.edu.ar, secretaria@inifta.unlp.edu.ar</td>
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<div style="font-size: 12.8px;"><span style="font-size: 12.5px;">Estimados: </span><br style="font-size: 12.5px;" /><br style="font-size: 12.5px;" /><span style="font-size: 12.5px;">Agradecemos la difusión de la próxima charla del IFLYSIB.</span>
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<div style="font-size: 12.8px;">La comisión Chifly.</div>
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<div style="font-size: 12.8px;"><span style="font-family: arial, sans-serif; font-size: large;">Hola a tod@s,</span></div>
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<div><span style="font-size: large;"><span style="font-family: arial, sans-serif;">L@s invitamos a la próxima charla del iflysib a realizarse el día <span style="color: #0000ff;">martes 22/3</span><span style="color: #9900ff;"> </span><span style="color: #000000;">a las</span><span style="color: #9900ff;"> </span><span style="color: #0000ff;">10:30 hs</span>. En esta oportunidad, </span><span style="color: #0000ff;">Chris Hooley </span>(SUPA, St Andrews) nos va hablar sobre:</span></div>
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<span style="color: #0000ff; font-size: large;">A new type of non-Fermi-liquid near the ferromagnetic transition in a 2D metal<br /></span>
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<div style="font-size: 12.8px;"><span style="font-family: arial, sans-serif; font-size: large;">L@s esperamos con café </span><span style="font-size: large;">y facturas</span><span style="font-size: large;">! </span></div>
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<div style="font-size: 12.8px;"><strong style="font-size: large;">Atención al nuevo horario: 10:30 hs.</strong><span style="font-size: large;"><br /></span></div>
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<div style="font-size: 12.8px;"><span style="font-size: large;">IFLYSIB (Instituto de Física de Líquidos y Sistemas Biológicos)</span></div>
<div style="font-size: 12.8px;"><span style="font-size: large;">Calle 59, 789 entre 10 y 11</span></div>
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<div style="font-size: 12.8px;"><span style="font-size: large;">Comisión Chifly</span></div>
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<div><span style="color: #0000ff;"><span style="font-size: large;">A new type of non-Fermi-liquid near the ferromagnetic transition in a 2D metal</span><br /><span style="font-size: large;">Chris Hooley (SUPA, St Andrews)</span><br /><br /><span style="font-size: large;">In this seminar I shall consider the low-temperature behaviour of a </span><span style="font-size: large;">two-dimensional metal near a second-order transition to </span><span style="font-size: large;">ferromagnetism. This is a particular example of the type of problem </span><span style="font-size: large;">referred to by the phrase ‘quantum criticality’. In general, magnetic </span><span style="font-size: large;">fluctuations near such a quantum critical point are subject to Landau </span><span style="font-size: large;">damping due to their coupling to the conduction electrons. However, </span><span style="font-size: large;">in the ferromagnetic case this damping must vanish as the wavevector </span><span style="font-size: large;">of the fluctuation tends to zero, since uniform magnetisation (being a </span><span style="font-size: large;">conserved quantity of the model) cannot be damped.</span><br /><br /><span style="font-size: large;">It is usually assumed [1,2], on the basis of a perturbative </span><span style="font-size: large;">calculation, that the Landau-damping rate is proportional to the </span><span style="font-size: large;">modulus of the wavevector, i.e. goes as |q|. However, in this seminar </span><span style="font-size: large;">I shall describe a calculation (carried out using the functional </span><span style="font-size: large;">renormalisation group) that suggests that this is not the case. </span><span style="font-size: large;">Instead, we find a new type of low-energy fixed-point that corresponds </span><span style="font-size: large;">to a strongly interacting non-Fermi-liquid in which the Landau damping </span><span style="font-size: large;">rate goes as |q|^(3/5), and the specific heat as T^(10/13). I shall </span><span style="font-size: large;">discuss the physics of this fixed point and where it might be seen in </span><span style="font-size: large;">nature, the relationship of our calculation to other works on nearly </span><span style="font-size: large;">ferromagnetic metals, and possible avenues of future investigation.</span><br /><br /><span style="font-size: large;">This work was done in collaboration with my PhD student Sam Ridgway; </span><span style="font-size: large;">details are available in S.P. Ridgway and CAH, Phys. Rev. Lett. 114, </span><span style="font-size: large;">226404 (2015).</span><br /><br /></span><span style="font-size: large;"><span style="color: #0000ff;">[1] J.A. Hertz, Phys. Rev. B 14, 1165 (1976).<br />[2] A.J. Millis, Phys. Rev. B 48, 7183 (1993).</span><span><span style="color: #888888;"><br /></span></span></span></div>
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<div><span style="font-family: arial;"><span style="font-size: small;"><strong>Comisión Chifly</strong></span></span></div>
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