Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2001-04-07
Phys. Rev. Lett., 87 (2001) 236802
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 RevTeX pgs, 1 eps figures, submitted to PRL
Scientific paper
10.1103/PhysRevLett.87.236802
For sufficiently strong in-plane magnetic field a $\nu_T=1$ bilayer quantum Hall pseudo-ferromagnet is expected to exhibit a soliton lattice. For sufficiently close layers and large in-plane field, we predict this incommensurate ``planar'' phase $P_I$ to undergo a reentrant pseudo-spin canting transition to an incommensurate state $C_I$, with a finite out-of-plane pseudo-magnetization component, corresponding to an interlayer charge imbalance in regions between solitons. At $T>0$ the transition is in the 2d compressible Ising universality class, and at T=0, the quantum transition is in heretofore unexplored universality class. The striking experimental signatures are the universal nonlinear charge-voltage and in-plane field relations, and the divergence of the differential bilayer capacitance at the transition, resulting in a bilayer capacitor that spontaneously charges itself, even in the absence of an applied interlayer voltage.
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