Optical absorption in the soliton lattice state of a double quantum well system - art. no. 205304

For sufficiently small separation between layers in a double quantum well s ystem, the ground state of the two-dimensional electron gas at filling fact or nu = 1 has an interwell phase coherence even in the absence of tunneling . With tunneling, this coherent state goes through a commensurate-incommens urate transition as the sample is tilted with respect to the quantizing mag netic field at nu = 1. In this article, we compute the change in the infrar ed absorption spectrum of the electron gas when the ground state evolves fr om the commensurate state at small tilt angle to the soliton lattice state at larger tilt angle. We also comment on the possibility of observing exper imentally the distinctive signature of the soliton lattice in the absorptio n spectrum.