  We use a recently developed fRG method (extendend Coupled-Ladder
Approximation) to study the 0.7-analog in quantum point contacts, arising at
the crossing of the 1st and 2nd band at suf- ficiently high magnetic fields. We
reproduce the main features of the experimentally observed magnetic field
dependence of the conductance at the 0.7-analog, using a QPC model with two
bands and short-range interactions. In particular, we reproduce the fact that
this dependence is quali- tatively different, depending on whether the analog
is approached from higher or lower magnetic fields. We show that this effect
can be explained qualitatively within a simple Hartree picture for the
influence of the lowest electrons.
