Highly sensitive photocurrent spectroscopy of resonant couplings between GaAs/AlAs superlattice Stark ladders and GaAs single quantum well states - Nogami, T.; Kawasaki, K.; Kawashima, K.; Fujiwara, K. (American Institute of Physics (AIP), 2000)
http://dx.doi.org/10.1063/1.373476
Keywords: U