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Size-scaling experiment in a two-dimensional electron gas using an inhomogeneous magnetic field due to a superconducting gate
Geim, A K; Dubonos, S V; Grigorieva, I V; Bending, S J
Surface Science. 1996;362(1-3):311-314.
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Abstract
We have used a superconducting gate on the top of a two-dimensional electron gas (2DEG) to partition an external magnetic field into a distribution of submicron Bur tubes (vortices) and measure the weak localisation contribution to the 2DEG conductance versus spatial separation of the vortices. It is found that the effect of a vortex extends far beyond its actual size. The experiment is discussed in terms of size scaling of the quantum conductance. The measured minimum size of an independent region of a 2DEG is in agreement with the phase-breaking length of electrons as deduced from the weak localisation magnetoresistance.
Keyword(s)
2-dimensional electrons; electrical transport; flux tubes; heterojunctions; magnetoresistance; quantum effect; superconductor-semiconductor thin film structures; weak localization
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- Related website <Go to ISI>://A1996UZ03300076
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