Effect of Zeeman splitting on magnetoresistivity of 2D hole gas in a Ge₁₋ₓSiₓ/Ge/Ge₁₋ₓSiₓ quantum well
Arapov, Yu. G. · Neverov, V. N. · Harus, G. I. · Shelushinina, N. G. · Yakunin, M. V. · Kuznetsov, O. A. · de Visser, A. · Ponomarenko, L.
Original · EN
For a two-dimensional (2D) hole system (confined within Ge layers of a multilayered p-Ge/Ge₁₋ₓSiₓ heterostructure) described by Luttinger Hamiltonian with the g-factor highly anisotropic for orientations of magnetic field perpendicular and parallel to the 2D plane (gₚerp >> gₚar), reported is an observation of low-temperature transition from metallic (dR/dT > 0) to insulator (dR/dT < 0) behavior of resistivity R(T) induced by a perpendicular magnetic field B. The revealed positive magnetoresistance scales as a function of B/T. We attribute this finding to a suppression of the triplet channel of electron-electron (hole-hole) interaction due to Zeeman splitting in the hole spectrum.
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