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 |
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其他作者: | School of Physical and Mathematical Sciences |
格式: | Article |
語言: | English |
出版: |
2013
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主題: | |
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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