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Magneto-EELS of armchair boronitrene nanoribbons

机译：扶手椅硼硝基纳林磁石

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The evolution of the electron energy loss spectrum (EELS) of ultranarrow armchair boron nitride nanoribbons (aBNNRs) during low and high photon energy transfers has been studied theoretically when a magnetic field and temperature gradient are applied. In order to achieve this goal, the widely used linear response theory within the Green's function theory was employed. Here, using the EELS we show that sigma bar right arrow sigma* or pi bar right arrow pi* and sigma bar right arrow pi* or pi bar right arrow sigma* excitations corresponding to the intraband and interband transitions, respectively, can be tuned by ribbon width, magnetic field, wave vector transfer, and temperature. A comparison with experimental studies reveals that for realistic ribbon widths, i.e. 10-100 nm, both excitations are weak. However, we observe that only transitions between the same states, i.e. sigma bar right arrow sigma* or pi bar right arrow pi* can be controlled with a magnetic field due to the localized highest occupied and lowest unoccupied states at low-energy regions and different states are not influenced when the magnetic field is applied. Interestingly, the detailed shape of the magneto-EELS of the 7-aBNNR indicates a direct-to-indirect band gap transition when the wave vector transfer is perpendicular to the 7-aBNNR plane. Finally, we discover that there is an anomalous behavior for the temperature dependence of the magneto-EELS in general. The present work brings forward the understanding of the magneto-EELS of ultranarrow aBNNRs under different environmental conditions for logic applications in nanoplasmonics.
机译：的电子能量损失光谱的演变（EELS）超窄扶手椅氮化硼纳米带（aBNNRs）中的低和高光子能量转移时被施加的磁场和温度梯度已被理论研究。为了实现这一目标，采用了绿色函数理论中广泛使用的线性响应理论。在这里，使用EELS我们显示Sigma Bar右箭头Sigma *或PI杆右箭头PI *和Sigma Bar右箭头PI *或PI Bar右箭头Sigma *分别对应的IntrAband和InterBand转换的激励可以调整带宽，磁场，波矢量转移和温度。与实验研究的比较表明，对于现实的色带宽度，即10-100nm，两个激动都很脆弱。然而，我们观察到，由于低能耗区域的局部最高占用和最低未占用的状态，只能使用相同状态之间的转换，即Sigma杆右箭头Sigma *或PI杆右箭头PI *，并且由于低能量区域的局部最高占用和最低的未占用状态而被控制当施加磁场时，状态不会影响。有趣的是，7-aBNNR的磁 - EELS的详细形状表示直接对间接带隙跃迁当波矢量传递垂直于7- aBNNR平面。最后，我们发现一般而言，磁鳗的温度依赖性存在异常行为。目前的作品在纳米纳米上的不同环境条件下，在不同的环境条件下提出了对Undranarrow ABNRS的磁鳗的理解。

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  • 来源
    《RSC Advances》 |2019年第5期|共7页
  • 作者

    Le P. T. T.; Mirabbaszadeh K.; Yarmohammadi M.;

  • 作者单位

    Ton Duc Thang Univ Adv Inst Mat Sci Lab Magnetism &

    Magnet Mat Ho Chi Minh City Vietnam;

    Amirkabir Univ Technol Dept Energy Engn &

    Phys Tehran Iran;

    Amirkabir Univ Technol Dept Energy Engn &

    Phys Tehran Iran;

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  • 正文语种 eng
  • 中图分类 化学;
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