Bloch oscillations at room temperature in graphene/h-BN electrostatic superlattices

M Dragoman; A Dinescu; D Dragoman; Florin Comanescu

doi:10.1088/1361-6528/ac02e6

Bloch oscillations at room temperature in graphene/h-BN electrostatic superlattices

Nanotechnology. 2021 Jun 4;32(34). doi: 10.1088/1361-6528/ac02e6.

Authors

M Dragoman¹, A Dinescu¹, D Dragoman^{2

3}, Florin Comanescu¹

Affiliations

¹ National Institute for Research and Development in Microtechnology (IMT), Str. Erou Iancu Nicolae 126 A, Voluntari, Romania.
² Univ. of Bucharest, Physics Faculty, PO Box MG-11, 077125 Bucharest, Romania.
³ Academy of Romanian Scientists, Str. Ilfov, Nr. 3, 050044 Bucharest, Romania.

PMID: 34010822
DOI: 10.1088/1361-6528/ac02e6

Abstract

In this manuscript, we report the fabrication and the measurements of Bloch oscillations at room temperature in electrostatic graphene/h-BN superlattices. The electrostatic superlattice consists of an array of tilted metallic electrodes deposited over graphene monolayer/h-BN monolayer grown on 2 inch wafers of doped Si/SiO₂. We show the formation of minibands at room temperature, negative differential resistance and the evidence of Bloch oscillations. The experimental results are sustained by numerical modelling of these 2D superlattices. The experimental results are sustained by numerical modelling of these 2D superlattices. At room temperature, we have measured a period of Bloch oscillations of 55 meV which corresponds to a frequency of 13 THz.

Keywords: Bloch oscillations; graphene/hBN; superlattice.