- PII
- 10.31857/S0044451024040114-1
- DOI
- 10.31857/S0044451024040114
- Publication type
- Article
- Status
- Published
- Authors
- Volume/ Edition
- Volume 165 / Issue number 4
- Pages
- 572-580
- 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.
- Keywords
- Date of publication
- 16.09.2025
- Year of publication
- 2025
- Number of purchasers
- 0
- Views
- 5
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