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势场调控下石墨烯/六方氮化硼范德瓦尔斯异质结的能带结构
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Abstract:
石墨烯和六方氮化硼堆叠在一起时可以通过范德瓦尔斯力形成层状异质结，称为范德瓦尔斯异质结。我们利用紧束缚模型研究了AA堆叠和AB堆叠结构下石墨烯/六方氮化硼范德瓦尔斯异质结体系的能带结构。提出了利用局域势和层间势调控能带的有效方法。结果表明，势场可以改变范德瓦尔斯材料的能带结构，使体系从绝缘相向金属相转变。
When graphene and hexagonal boron nitride are stacked together, a layered heterojunction can be formed by van der Waals force, which is called van der Waals heterojunction. We use the tight-binding model to study the band structure of the AA-stacked and AB-stacked graphene/hexagonal boron nitride van der Waals heterojunctions. An effective method to manipulate the energy band by using the local potential and the inter-layer potential is proposed. The results show that the potential fields can change the energy band structures of van der Waals materials, leading to a phase transition from insulating phase to metallic phase.
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