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Progress in the study of thermotropic rotation of graphene / boron nitride heterostructures

Release date:2017-11-22 Author: Click:

     

Two dimensional material Fan Dehua heterostructure has attracted extensive research interest in the field of two-dimensional materials and physics recently. Different two-dimensional materials can form different types of heterostructures through the combination of van Edward force, which can often show the characteristics that a single two-dimensional material does not possess. The appearance of artificial heterojunctions provides great space for researchers to design different structures and devices purposefully. For example, vertical tunneling transistor, two-dimensional material laser and so on. When constructing two-dimensional material heterojunction, the relative angle between different materials is a very important parameter. It will significantly regulate the energy band of heterojunction, thus affecting its electrical and optical properties. Graphene / boron nitride is one of the most typical representatives. When the graphene is bonded with six boron nitride, the surface of the graphene will be mole stripe, and the period of the moire fringe is closely related to the rotation angle between the two. This Moorish stripe can be seen as the regulation of the periodic potential of the graphene by the boron nitride substrate, which leads to the reconstruction of the energy band of graphene, such as the self similar supercrystalline lattice bands, and the opening of the energy gap of the graphene. In recent years, the N07 group, led by Zhang Guangyu, a researcher at the Institute of physics, the Academy of Sciences of the Chinese Academy of Sciences, and international counterparts have conducted extensive and in-depth studies on graphene / six square boron nitride mole superlattice systems by means of transport, optics, and scanning tunneling microscopy, and reported a series of original results. However, there is still a lack of research on the thermodynamic stability of two-dimensional material heterostructures.

Recently, Wang Duoming, a PhD student, directed by Zhang Guangyu and Shi Dongxia, a researcher in physics, took the lead in developing the research work on the thermodynamic stability of the boron nitride heterostructure in Shi Moxi / six party. First, they transfer graphene accurately to six boron nitride substrates to obtain randomly stacked graphene / six boron nitride heterostructures. When the temperature is above 100, the graphene on the surface of boron nitride will rotate spontaneously. They first studied the relationship between the interaction between graphene and six boron nitride and the angle between the two. In combination with first principles calculations, bistability is found. At 0 degree, the lattice orientation of graphene is the same as that of BN, and the lowest energy is the most stable state. At 30 degrees, there is another minimum value of the system energy, which is metastable. Subsequent studies show that there is a critical point between 0 degrees and 30 degrees, which is about 12 degrees. When the rotation angle between graphene and boron nitride is less than 12 degrees, the graphene will rotate at 0 degrees. When the rotation angle is greater than 12 degrees, the graphene will rotate at 30 degrees. By controlling the annealing temperature and time, the sample with 0-30 degrees at any angle can be obtained by controlling the annealing temperature and time, which provides an ideal platform for the study of the mole superlattice system. In addition, they found similar phenomena in other two-dimensional materials such as Fan Dehua / Shi Moxi, MoS2/ six boron nitride, etc. The spontaneous rotation of the two-dimensional material heterostructure provides a new understanding for the study of the stability and mechanical properties of the Fan Dehua heterogeneous interface. It is expected to be applied in the realization of interface superlubrication, the regulation of physical properties of two-dimensional materials, and the construction of a two-dimensional micro nano mechanical system. The work was published in the Physical Review Bulletin (PRL 116, 126101 (2016)) and was highly evaluated by the reviewers and editors, and was recommended as a highlight of the period.

The work has been given by Fudan University Zhang Yuanbo, Chen Guorui in the preparation of samples and the theoretical calculation of the Peking University Feng Ji and Li Zhaokai in theoretical calculation. The work has been funded by the Ministry of science and technology's "973" youth project, the National Natural Science Foundation of China and the Chinese Academy of Sciences pilot project (category B).

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