G.A. Held, P.M. Horn, et al.
Solid State Communications
Periodic instabilities of frequency f0 in an electron-hole plasma in Ge are excited with an external perturbation V1 sin (2f1t). Varying V1 and f1 results in quasiperiodic, mode-locked, and chaotic states comparable to those expected theoretically. Increasing V1 while keeping the ratio f0f1 fixed at the golden mean (1.6180...), we observe a universal transition to chaos, in quantitative agreement with theory. Driving the instability simultaneously at two incommensurate frequencies, f1 and f2, we observe transitions between three-frequency quasiperiodicity, two-frequency mode locking, and chaos. © 1986 The American Physical Society.
G.A. Held, P.M. Horn, et al.
Solid State Communications
I. Dierking, L.L. Kosbar, et al.
Liquid Crystals
G.A. Held, G. Grinstein
Applied Physics Letters
G.A. Held, G. Grinstein, et al.
PNAS