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Effect of Zeeman splitting on magnetoresistivity of 2D hole gas in a Ge_{1-x}Si_x/Ge/Ge_{1-x}Si_x quantum well

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arxiv cond-mat/0404355 v1 pith:OYAYIR6J submitted 2004-04-15 cond-mat.mes-hall

Yu.G. Arapov , V.N. Neverov , G.I. Harus , N.G. Shelushinina , M.V. Yakunin , O.A. Kuznetsov , A. de Visser , L. Ponomarenko This is my paper · ORCID
classification cond-mat.mes-hall
keywords holefieldmagneticperpendicularsplittingzeemananisotropicattribute
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For a two-dimensional (2D) hole system (confined within Ge layers of a multilayered p-Ge/Ge_{1-x}Si_x heterostructure) described by Luttinger Hamiltonian with the g-factor highly anisotropic for orientations of magnetic field perpendicular and parallel to the 2D plane (g_perp >> g_par), 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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