Si. Shevchenko et al., ON THE SUPERFLUIDITY AND CRYSTALLIZATION IN A SYSTEM OF SURFACE ELECTRONS PAIRED WITH SUBSTRATE HOLES, Czechoslovak journal of Physics, 46, 1996, pp. 313-314
The collective properties of system of surface electrons on a film of
superfluid He-4 paired with substrate holes is discussed. The case whe
n size of pairs is much smaller than their average separation is consi
dered. The possibility of superfluidity of pairs is investigated, and
the estimation of superfluid transition temperature is given. The cond
itions of competition between the superfluid transition and the pair c
rystallization with formation of a dipole crystal is discussed. The me
lting temperature of the dipole crystal is calculated in the assumptio
n that the crystallization occurs according to the Kosterlitz-Thouless
mechanism. The conditions under which the quantum effects prevent the
crystallization down to zero temperature are determined. The problem
of localization of pairs by impurities or structure irregularities is
analyzed.