DOUBLE MAGNETORESISTANCE MINIMA INDUCED BY THE IN-PLANE MAGNETIC FIELD FOR THE ν=1 DOUBLE-LAYER QUANTUM HALL STATE

We have investigated ν=1 quantum Hall (QH) state in a double-layer system around the commensurate (C) -incommensurate (IC) transition. Detailed magnetoresistance measurements around the C-IC transition reveal that there are two minima within the ν=1 QH state. These minima, being induced by the difference of the in-plane magnetic field, correspond to the C and IC phases, respectively. The region between the two minima may be the soliton lattice phase predicted by theoretical analyses.