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木虫 (著名写手)

[求助] 求教,纯净石墨烯能带曲线上的这几个对称点坐标是多少?实在是算不出来……

如图,假设横坐标总长(Gamma到Gamma)为1,那么K点坐标和M点坐标分别是多少?算了好久也算不对……郁闷
求教,纯净石墨烯能带曲线上的这几个对称点坐标是多少?实在是算不出来……
QQ图片20131122214001.jpg
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jpchou

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franch: 金币+5, 谢谢回帖交流 2013-11-26 01:02:18
???????:
14?: Originally posted by souledge at 2013-11-25 00:18:17
?????????????x????????????????3D?????????????????·????????????????????????弸?ε????????????????????????
???????????????????????????е??????????????????ī???graphene?? ...

??~????f?????μ??P????????????@???
"?ο??????GKM?????????????????Σ?????Gamma??????30???M???90???
??????е?????????????????GK:KM:MG = 2:1:1.732????"
?@?????????}??

?D???????"????"?????????
???????????????????g?? Cartesian coordinate
???????T???? Cartesian coordinate ?????????????
??????F?? XCrysDen ?D??_?? Cartesian coordinate ???????????
??????????????????????g????????K??????????????ε????????
?????C??????

????c G M K ?????e??
G(   0,    0,   0)
K(1/2,     0,  0)
M(2/3, 1/3,   0)
?????@?????c??g???L??
GK = 1/2
GM = R(5/9)
GK:MG ?????????????ε???? 2:R3 ~ ???? 1/2 : R(5/9)


???GKM "????"?????????
???H???????_???????????
???l????
??????D???????????????????@????
?????????? b1 b2 b3 ???]?M??
GKM ????_?_??A?? 30 60 90 ???????????
16楼2013-11-25 01:27:10
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jpchou

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?? lattice constant and lattice vector ????ó???
2楼2013-11-23 15:54:52
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前田庆次

木虫 (著名写手)

???????:
2?: Originally posted by jpchou at 2013-11-23 15:54:52
?? lattice constant and lattice vector ????ó???

??????lattice constant = 5.68
lattice vector:
a1= (3/2, ??3/2)
a2= (3/2, -??3/2)
???????f???????????????????????Y??????????????m????
长枪一横花飘零,松风追月伴我行。无双人间世如梦,倾奇万世永留名。
3楼2013-11-23 16:30:55
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jpchou

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http://zh.wikipedia.org/wiki/%E5%80%92%E6%99%B6%E6%A0%BC

????????o???@?W?
???м??c
?m???????S???Y??
????????????S???g
??????????????? GM or GK or KM ?g???x
????????????B?????????g??
???????S ????????
???? b1, b2
a1, a2, a3 ??@???S???~??????
????м??x??o???W?
?K????????
??o x y ??????????????
4楼2013-11-24 06:18:16
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