[Todos] Fwd: CHARLA IFLYSIB: martes 22/3 - 10:30 hs - A new type of non-Fermi-liquid near the ferromagnetic transition in a 2D metal

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		ASUNTO:
 		CHARLA IFLYSIB: martes 22/3 - 10:30 hs - A new type of
non-Fermi-liquid near the ferromagnetic transition in a 2D metal

		FECHA:
 		2016-03-17 10:08

		REMITENTE:
 		Charlas Iflysib <charlas.iflysib at gmail.com>

		DESTINATARIO:
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info at ciop.unlp.edu.ar, internet at biol.unlp.edu.ar, scyt at frlp.utn.edu.ar,
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secre at mate.unlp.edu.ar, secretaria at inifta.unlp.edu.ar

Estimados: 

Agradecemos la difusión de la próxima charla del IFLYSIB. 

La comisión Chifly. 

************************************************************ 

Hola a tod at s, 

L at s invitamos a la próxima charla del iflysib a realizarse el día martes
22/3 a las 10:30 hs. En esta oportunidad, Chris Hooley (SUPA, St
Andrews) nos va hablar sobre: 

 A new type of non-Fermi-liquid near the ferromagnetic transition in a
2D metal

L at s esperamos con café y facturas! 

ATENCIÓN AL NUEVO HORARIO: 10:30 HS.

IFLYSIB (Instituto de Física de Líquidos y Sistemas Biológicos) 
Calle 59, 789 entre 10 y 11 

Comisión Chifly 

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A new type of non-Fermi-liquid near the ferromagnetic transition in a 2D
metal
Chris Hooley (SUPA, St Andrews)

In this seminar I shall consider the low-temperature behaviour of a
two-dimensional metal near a second-order transition to ferromagnetism.
This is a particular example of the type of problem referred to by the
phrase 'quantum criticality'. In general, magnetic fluctuations near
such a quantum critical point are subject to Landau damping due to their
coupling to the conduction electrons. However, in the ferromagnetic case
this damping must vanish as the wavevector of the fluctuation tends to
zero, since uniform magnetisation (being a conserved quantity of the
model) cannot be damped.

It is usually assumed [1,2], on the basis of a perturbative calculation,
that the Landau-damping rate is proportional to the modulus of the
wavevector, i.e. goes as |q|. However, in this seminar I shall describe
a calculation (carried out using the functional renormalisation group)
that suggests that this is not the case. Instead, we find a new type of
low-energy fixed-point that corresponds to a strongly interacting
non-Fermi-liquid in which the Landau damping rate goes as |q|^(3/5), and
the specific heat as T^(10/13). I shall discuss the physics of this
fixed point and where it might be seen in nature, the relationship of
our calculation to other works on nearly ferromagnetic metals, and
possible avenues of future investigation.

This work was done in collaboration with my PhD student Sam Ridgway;
details are available in S.P. Ridgway and CAH, Phys. Rev. Lett. 114,
226404 (2015).

[1] J.A. Hertz, Phys. Rev. B 14, 1165 (1976).
[2] A.J. Millis, Phys. Rev. B 48, 7183 (1993).

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