Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-11-11
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
12 pages, 5 figures
Scientific paper
The effect of a spatially modulated magnetic field on the weak localization phenomenon in two-dimensional electron gas (2DEG) is studied. Both the dephasing time $\tau_H$ and magnetoresistance are shown to reveal a nontrivial behavior as functions of the characteristics of magnetic field profiles. The magnetic field profiles with rather small spatial scales $d$ and modulation amplitudes $H_0$ such that $H_0d^2\ll\hbar c/e$ are characterized by the dephasing rate $\tau_H^{-1}\propto H_0^2d^2$. The increase in the flux value $H_0d^2$ results in a crossover to a standard linear dependence $\tau_H^{-1}\propto H_0$. Applying an external homogeneous magnetic field $H$ one can vary the local dephasing time in the system and affect the resulting average transport characteristics. We have investigated the dependence of the average resistance vs the field $H$ for some generic systems and predict a possibility to observe a positive magnetoresistance at not too large $H$ values. The resulting dependence of the resistance vs $H$ should reveal a peak at the field values $H\sim H_0$.
Mel'nikov A. S.
Mironov Sergey V.
Sharov Sergei V.
No associations
LandOfFree
Dephasing time and magnetoresistance of two-dimensional electron gas in spatially modulated magnetic fields does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Dephasing time and magnetoresistance of two-dimensional electron gas in spatially modulated magnetic fields, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dephasing time and magnetoresistance of two-dimensional electron gas in spatially modulated magnetic fields will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-533482