Multiterminal measurements of magnetoresistance fluctuations in silicon inversion-layer nanostructures are extended to probe spacings LL, the phase-preserving diffusion length. Unlike for L>L, the sizes of the voltage fluctuations are independent of L, and have novel correlations consistent with independent potential fluctuations of each probe. The corresponding "conductance" fluctuations G(L) are e2h; however, this can be understood if each pair of probes effectively measures voltage fluctuations at scale L, determined by the condition G(L)=e2h.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)