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A controllable valley polarization in Graphene

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arxiv 1303.0804 v1 pith:I7C3B4GC submitted 2013-03-04 cond-mat.mes-hall cond-mat.mtrl-sci

A controllable valley polarization in Graphene

Yang Liu , Juntao Song , Yuxian Li , Ying Liu , Qing-feng Sun This is my paper
classification cond-mat.mes-hall cond-mat.mtrl-sci
keywords line-defectsvalleypolarizationgrapheneresonatorangleconicalcontrollable
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The electron transport of different conical valleys is investigated in graphene with extended line-defects. Intriguingly, the electron with a definite incident angle can be completely modulated into one conical valley by a resonator which consists of several paralleling line-defects. The related incident angle can be controlled easily by tuning the parameters of the resonator. Therefore, a controllable 100% valley polarization, as well as the detection of the valley polarization, can be realized conveniently by tuning the number of line-defects and the distance between two nearest neighbouring line-defects. This fascinating finding opens a way to realize the valley polarization by line-defects. With the advancement of experimental technologies, this resonator is promising to be realized and thus plays a key role in graphene valleytronics.

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