Effective theory of quadratic degeneracies

We present an effective theory for the Bloch functions of a two-dimensional square lattice near a quadratic degeneracy point. The degeneracy is protected by the symmetries of the crystal, and breaking these symmetries can either open a band gap or split the degeneracy into a pair of linear degenerac...

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Main Authors: Soljačić, Marin, Chong, Yidong, Wen, Xiao-Gang
其他作者: School of Physical and Mathematical Sciences
格式: Article
語言:English
出版: 2013
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在線閱讀:https://hdl.handle.net/10356/101039
http://hdl.handle.net/10220/18344
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機構: Nanyang Technological University
語言: English

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