Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-02-18
J. Phys.: Condens. Matter 16, 6431 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
16 pages, 10 figures
Scientific paper
10.1088/0953-8984/16/36/009
The 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 $\epsilon(p)=\mu$, a condition that ordinarily has the Fermi momentum $p_F$ 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.
Baldo Marcello
Borisov V. V.
Clark John Willis
Khodel Victor A.
Zverev M. V.
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