JETP Letters

pp 1–5

Band gap tuning of Ge/SiC bilayers under an electric field: a density functional study

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Abstract

The structure and electronic properties of Ge/SiC van der Waals (vdW) bilayer under the influence of an electric field have been investigated by the first-principles method. Without an electric field, the system shows a small band gap of 126 meV at the equilibrium state. Interestingly, by applying a vertical external electric field, the results present a parabola-like relationship between the band gap and the strength. As the negative E-field changes from 0.0 to −0.40 V/Å, the band gap first increases to a maximum of about 378meV and then decreases to zero. A similar trend is exhibited for the positive E-field, ranging from 0.0 to +0.40 V/Å. The band gap reaches a maximum of about 315meV at +0.10 V/Å. The significant variations of band gap are owing to different states of Ge, Si, and C atoms in conduction band and valence band. The predicted electric field tunable band gap of the Ge/SiC vdW heterostructures is very promising for its potential use in nanodevices.

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© Pleiades Publishing, Inc. 2017

Authors and Affiliations

  1. 1.Department of PhysicsShanghai Second Polytechnic UniversityShanghaiChina
  2. 2.Department of Electronic EngineeringShang Hai Jian Qiao UniversityShanghaiChina
  3. 3.Key Laboratory of Polar Materials and DevicesEast China Normal UniversityShanghaiChina

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