【摘 要】
：
拓扑绝缘体(TI)是继石墨烯后的一个重大发现,具有重要的科学意义和巨大的应用前景.在基于TI的应用中,二维TI薄膜尤为重要.最近实验发现Bi2Se3和Bi2Te3薄膜的性质随厚度变化有
【出 处】
：
第十八届全国凝聚态理论与统计物理学术会议
论文部分内容阅读
拓扑绝缘体(TI)是继石墨烯后的一个重大发现,具有重要的科学意义和巨大的应用前景.在基于TI的应用中,二维TI薄膜尤为重要.最近实验发现Bi2Se3和Bi2Te3薄膜的性质随厚度变化有明显不同.对Bi2Se3,当厚度为2QL和3QL时,Dirac锥的能隙分别为0.26 eV和0.14 eV,当厚度为6QL时,能隙减小为零.但是对Bi2Te3,当厚度仅为2QL时,Dirac锥的能隙就几乎为0 eV.考虑到Bi2Se3和Bi2Te3的相似性,二者随厚度演化的显著差异一直很难理解.
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