Dissipation of intersubband plasmons in wide quantum wells - art. no. 037401

This Letter reports detailed measurements of the dissipation times tau (d) of similar to 10 meV intersubband (ISB) plasmons, and of the (single-partic le) transport lifetimes tau (mu), in a remotely doped 40 nm GaAs quantum we ll. Introduced here as the time for ISB plasmons to dissipate into other mo des of the electron gas, tau (d) is deduced from the homogeneous ISB absorp tion Linewidth, measured as a function of sheet concentration and perpendic ular de electric field. Modeling in this and the next Letter [C. A. Ullrich and G. Vignale, Phys. Rev. Lett. 87, 037402 (2001)] indicates that scatter ing from rough interfaces dominates rd, while scattering from ionized impur ities dominates tau (mu).