Rosini, M.Reggiani, L. (Lino), 1941-Gomila Lluch, Gabriel2009-12-292009-12-2920070163-1829https://hdl.handle.net/2445/10630Within a drift-diffusion model we investigate the role of the self-consistent electric field in determining the impedance field of a macroscopic Ohmic (linear) resistor made by a compensated semi-insulating semiconductor at arbitrary values of the applied voltage. The presence of long-range Coulomb correlations is found to be responsible for a reshaping of the spatial profile of the impedance field. This reshaping gives a null contribution to the macroscopic impedance but modifies essentially the transition from thermal to shot noise of a macroscopic linear resistor. Theoretical calculations explain a set of noise experiments carried out in semi-insulating CdZnTe detectors.9 p.application/pdfeng(c) The American Physical Society, 2007Física de l'estat sòlidElectrònica quànticaElectronic transport in condensed matterElectronic structure and electrical properties of surfacesQuantum electronicsinfo:eu-repo/semantics/article550004info:eu-repo/semantics/openAccess