Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
1999-10-14
Physics
Condensed Matter
Disordered Systems and Neural Networks
10 pages, 4 jpeg figures
Scientific paper
10.1103/PhysRevB.61.7253
Large positive (P) magnetoresistance (MR) has been observed in parallel magnetic fields in a single 2D layer in a delta-doped GaAs/AlGaAs heterostructure with a variable-range-hopping (VRH) mechanism of conductivity. Effect of large PMR is accompanied in strong magnetic fields by a substantial change in the character of the temperature dependence of the conductivity. This implies that spins play an important role in 2D VRH conductivity because the processes of orbital origin are not relevant to the observed effect. A possible explanation involves hopping via double occupied states in the upper Hubbard band, where the intra-state correlation of spins is important.
Khondaker Saiful I.
Pepper Michael
Ritchie Dave A.
Shlimak Issai
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