Microwave pinning modes near Landau filling $\nu =1$ in two-dimensional electron systems with alloy disorder

B. -H. Moon, L. W. Engel, D. C. Tsui +2

We report measurements of microwave spectra of two-dimensional electron systems hosted in dilute Al alloy, Al${}_x$Ga${}_{1-x}$As, for a range of Landau level fillings, $\nu$, around 1.…