Pseudospin Transfer Torques in Semiconductor Electron Bilayers
  We use self-consistent quantum transport theory to investigate the influence of electron-electron interactions on interlayer transport in semiconductor electron bilayers in the absence of an external magnetic field. We conclude that, even though spontaneous pseudospin order does not occur at zero field, interaction-enhanced quasiparticle tunneling amplitudes and pseudospin transfer torques do alter tunneling I-V characteristics, and can lead to time-dependent response to a dc bias voltage. 
Youngseok Kim, Allan H. MacDonald, Matthew J. Gilbert
cond-mat.mes-hall