TRONG HALL EFFECT NONLINEARITY IN MACROSCOPICALLY MODULATED TWO-DIMENSIONAL SYSTEM

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Abstract

We study experimentally the low-temperature conductive properties of double-gate two dimensional array of islands in metal-oxide-semiconductor structure. The system appears to be a highly tunable two- dimensional metamaterial with diffusive transport and macroscopic modulation. In particular, we reveal several effects in magnetic field and gate voltages dependencies of the Hall coefficient, and Shubnikov-de Haas oscillations. In moderate magnetic fields 1T, the Hall effect carrier density demonstrates seemingly counterintuitive nonmonotonic behavior as function of gate voltage. This behavior, however, can be qualitatively described by mean-field approach for effective media. In small magnetic fields the strongest unexpected temperature- and gate-dependent Hall effect nonlinearity emerges, that can not be described by mean-field effective media theory. We argue that this effect can be related to weak-localization phenomena and current redistribution in inhomogeneous media. In the quantized magnetic field an unusual splitting of Shubnikov-de Haas resistivity minimum is observed. Our observation should stimulate studies of tunable modulated two-dimensional systems.

About the authors

A. V. Shupletsov

P.N. Lebedev Physical Institute of the RAS

Email: husderbec@mail.ru
Russian Federation, 119991, Moscow

M. S. Nunuparov

Qmodule lab

Email: husderbec@mail.ru
Russian Federation, 125493, Moscow

K. E. Prikhod'ko

National Research Center Kurchatov Institute; National Research Nuclear University MEPhI

Email: husderbec@mail.ru
Russian Federation, 123182, Moscow; 115409, Moscow

A. Yu. Kuntsevich

P.N. Lebedev Physical Institute of the RAS

Author for correspondence.
Email: husderbec@mail.ru
Russian Federation, 119991, Moscow

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