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In higher Landau levels (N>0) and around filling factors nu =4N+1, atwo-dimensional electron gas in a double-quantum-well system supports a stripegroundstate in which the electron density in each well is spatially modulated.When a parallel magnetic field is added in the plane of the wells, tunnelingbetween the wells acts as a spatially rotating effective Zeeman field coupledto the ``pseudospins'' describing the well index of the electron states. Forsmall parallel fields, these pseudospins follow this rotation, but at largerfields they do not, and a commensurate-incommensurate transition results.Working in the Hartree-Fock approximation, we show that the combination ofstripes and commensuration in this system leads to a very rich phase diagram.The parallel magnetic field is responsible for oscillations in the tunnelingmatrix element that induce a complex sequence of transitions betweencommensurate and incommensurate liquid or stripe states. The homogeneous andstripe states we find can be distinguished by their collective excitations andtunneling I-V, which we compute within the time-dependent Hartree-Fockapproximation.Comment: 23 pages including 8 eps figure

Commensurate-incommensurate transitions of quantum Hall stripe states in double quantum well systems