M Baldo et al 2004 J. Phys.: Condens. Matter 16 6431 doi:10.1088/0953-8984/16/36/009
Mechanisms driving alteration of the Landau state in the vicinity of a second-order phase transition
M Baldo1, V V Borisov2, J W Clark3, V A Khodel2 and M V Zverev2
Show affiliationsThe rearrangement of the Fermi surface of a homogeneous Fermi system upon approach to a second-order phase transition is studied at zero temperature. The analysis begins with an investigation of solutions of the equation 
(p) = μ, a condition that ordinarily has the Fermi momentum pF as a single root. The emergence of a bifurcation point in this equation is found to trigger a qualitative alteration of the Landau state, well before the collapse of the collective degree of freedom that is responsible for the second-order transition. The competition between mechanisms that drive rearrangement of the Landau quasiparticle distribution is explored, taking into account the feedback of the rearrangement on the spectrum of critical fluctuations. It is demonstrated that the transformation of the Landau state to a new ground state may be viewed as a first-order phase transition.
- PACS
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05.30.Fk Fermion systems and electron gas
64.70.F- Liquid–vapor transitions
71.10.Ay Fermi-liquid theory and other phenomenological models
64.60.-i General studies of phase transitions
71.18.+y Fermi surface: calculations and measurements; effective mass, g factor
- Subjects
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Quantum gases, liquids and solids
Condensed matter: electrical, magnetic and optical
- Dates
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Issue 36 (15 September 2004)
Received 18 February 2004
Published 27 August 2004
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Mechanisms driving alteration of the Landau state in the vicinity of a second-order phase transition
M Baldo et al 2004 J. Phys.: Condens. Matter 16 6431
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