Novel Phases of Planar Fermionic Systems

Details Novel Phases of Planar Fermionic Systems Novel Phases of Planar Fermionic Systems

1995-05-23

arxiv.org/abs/cond-mat/9505106v1

Physics

Condensed Matter

(murthy@buphy.bu.edu,shankar@cmphys.eng.yale.edu) 29 p Latex 4 figs uuencoded separately

Scientific paper

10.1088/0953-8984/7/48/007

We discuss a {\em family} of planar (two-dimensional) systems with the following phase strucure: a Fermi liquid, which goes by a second order transition (with non classical exponent even in mean-field) to an intermediate, inhomogeneous state (with nonstandard ordering momentum) , which in turn goes by a first order transition to a state with canonical order parameter. We analyze two examples: (i) a superconductor in a parallel magnetic field (which was discussed independently by Bulaevskii)for which the inhomogeneous state is obtained for $1.86 T_c \stackrel{\sim}{<} B \stackrel{\sim}{<} 1.86 \sqrt{2} T_c$ where $T_c$ is the critical temperature (in Kelvin) of the superconductor without a field and $B$ is measured in Tesla, and (ii) spinless (or, as is explained, spin polarized) fermions near half-filling where a similar, sizeable window (which grows in size with anisotropy) exists for the intermediate CDW phase at an ordering momentum different from $(\pi , \pi )$. We discuss the experimental conditions for realizing and observing these phases and the Renormalization Group approach to the transitions.

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