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The Transport Properties and Shot Noise in Monographene Supperlattice

Author: GuoXiaoXiao
Tutor: LiYuXian
School: Hebei Normal
Course: Condensed Matter Physics
Keywords: Graphene Step barrier structure Superlattice Dirac point Shot noise
CLC: O613.71
Type: Master's thesis
Year: 2011
Downloads: 107
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Abstract


In this paper, the transfer matrix method to study the transport properties of graphene superlattices and shot noise , we calculated graphene four different transmission probability of the barrier structure , the results show that the transmission electron asymmetry step potential barrier structure of the transmission probability , and these results are also conductance has been verified . Transmission probability and the shape of the barrier structure , and structural parameters . The narrower the width of the barrier , the greater the probability of transmission . Conductance shows the oscillation behavior , the conductance of the different shapes of the barrier structure presents different characteristics . Transmission coefficient with the incident angle change in the applied magnetic field , the change in the overall image moves to the left , no longer symmetrical vertically incident on the incident angle θ = 0 ( ) , and Klein tunneling region is also changed . In addition, the conductance changes with incident energy image change , the the conductance oscillation frequency becomes faster , smaller amplitude , when the magnetic barrier when the incident energy is greater than zero conductance . Periodic potential of graphene superlattices were studied. The calculation results showed that the graphene superlattice a new Dirac point . At this point, the transport almost been prohibited , the conductance becomes the minimum , the Fano factor reaches its maximum value of 1/3 . When the barrier width and well width equal to the Dirac point barrier height at half changed , when the barrier width and well width are not equal , the position of the Dirac point , the conductance minimum and the maximum value of the Fano factor The position is also changed . The location of the new Dirac point only barrier width and well width ratio , has nothing to do with the magnetic field . When the incident energy is less than the the Dirac point corresponding to the energy , as the magnetic field intensity increases , the conductance value is reduced , the Fano factor increases .

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Non-metallic elements and their compounds > Part Ⅳ family of non-metallic elements (carbon and silicon ) and its compounds > Carbon C
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