Journal article

Authors list: Uredat, Patrick; Hille, Pascal; Schoermann, Joerg; Eickhoff, Martin; Klar, Peter J.; Elm, Matthias T.

Publication year: 2019

Journal: Physical Review B

Volume number: 100

Issue number: 8

ISSN: 2469-9950

eISSN: 2469-9969

DOI Link: https://doi.org/10.1103/PhysRevB.100.085409

Publisher: American Physical Society

Abstract: 
The so called phase-coherence length l(phi) and its relation to the geometrical dimensions of a sample determine the electronic transport regime. Different approaches are established for extracting l(phi) from magnetotransport data of mesoscopic systems and need to be cross-checked by using experimental data on the same model system in order to ensure an overall consistent theoretical description. Suitable model systems for testing this consistency are single GaN:Ge nanowires. Their magnetoconductance at low temperatures exhibits universal conductance fluctuations as well as weak localization effects. We find that the values of l(phi) obtained from the established analysis of the magnitude of the conductance fluctuations rms(Delta G) decrease with increasing measurement current, whereas the corresponding values of l(phi) determined by the analyses of the correlation field B-c and the weak localization effect yield the same value for l(phi) independent of the measurement current used. We apply and modify the existing theoretical framework for bias-dependent differential conductance fluctuations, in order to explain the decrease of the conductance fluctuations rms(Delta G) with increasing current density in our dc measurements. This leads to the same values of l(phi) independent of the analysis approach applied to the same set of data.

Harvard Citation style: Uredat, P., Hille, P., Schoermann, J., Eickhoff, M., Klar, P. and Elm, M. (2019) Consistent description of mesoscopic transport: Case study of current-dependent magnetoconductance in single GaN:Ge nanowires, Physical Review B (condensed matter and materials physics), 100(8), Article 085409. https://doi.org/10.1103/PhysRevB.100.085409

APA Citation style: Uredat, P., Hille, P., Schoermann, J., Eickhoff, M., Klar, P., & Elm, M. (2019). Consistent description of mesoscopic transport: Case study of current-dependent magnetoconductance in single GaN:Ge nanowires. Physical Review B (condensed matter and materials physics). 100(8), Article 085409. https://doi.org/10.1103/PhysRevB.100.085409