【摘 要】
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Two-dimensional materials with Dirac cones have significant applications in photoelectric technology.The origin and manipulation of multiple Dirac cones need to
【机 构】
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Department of Physics and Institute of Applied Condensed Matter Physics,School of Science,Wuhan Univ
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Two-dimensional materials with Dirac cones have significant applications in photoelectric technology.The origin and manipulation of multiple Dirac cones need to be better understood.By first-principle calculations,we study the influence of exteal fields on the electronic structure of the hexagonal CrB4 sheet with double nonequivalent Dirac cones.Our results show that the two cones are not sensitive to tensile strain and out-of-plane electric field,but present obviously different behaviors under the in-plane exteal electric field(along the B-B direction),i.e.,one cone holds while the other vanishes with a gap opening.More interestingly,a new nonequivalent cone emerges under a proper in-plane electric field.We also discuss the origin of the cones in CrB4 sheet.Our study provides a new method on how to obtain Dirac cones by the exteal field manipulation,which may motivate potential applications in nanoelectronics.
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