双激光势垒和磁场作用下石墨烯的电导率

IF 2.5 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Applied Physics A Pub Date : 2024-12-20 DOI:10.1007/s00339-024-08168-1
Rachid El Aitouni, Miloud Mekkaoui, Abdelhadi Bahaoui, Ahmed Jellal
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引用次数: 0

摘要

研究了双势垒激光结构中光子辅助电荷在磁场辅助下的输运。利用Floquet理论和矩阵形式,计算了中心带和边带的传输概率。由于能谱的简并,激光场的时间周期性产生了无限多的传输模式。对所有模式进行数值寻址的挑战需要对能量\(\varepsilon \pm \varpi\)对应的第一边带进行限制。发现两个激光场之间的临界相位差抵消了由于量子干涉而通过边带的传输。改变施加磁场的区域的宽度,可以抑制横向传输和控制传输模式。激光场的强度还允许抑制克莱因隧道和阻断零光子交换的传输过程,以及激活光子交换的传输过程。电导也受系统参数变化的影响。由于激光场对费米子的限制,增加激光场的强度会降低费米子的电导。此外,增加施加磁场的区域的大小会降低电导,因为增加的距离使费米子有更大的扩散机会,并增加它们与磁场的相互作用。
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Conductance in graphene through double laser barriers and magnetic field

Photon-assisted charge transport through a double-barrier laser structure, separated by a region assisted by a magnetic field, is studied. Employing Floquet theory and matrix formalism, the transmission probabilities for the central band and sidebands are calculated. The temporal periodicity of the laser fields creates an infinite number of transmission modes due to the degeneracy of the energy spectrum. The challenge of numerically addressing all modes necessitates the limitation to the first sideband corresponding to energies \(\varepsilon \pm \varpi\). A critical phase difference between the two laser fields is found to cancel the transmission through the sidebands due to quantum interference. Varying the width of the region where the magnetic field is applied allows for the suppression of lateral transmission and control over the transmission mode. The intensity of the laser fields also allows for the suppression of Klein tunneling and blocking transmission processes with zero photon exchange, as well as activating transmission processes with photon exchange. The conductance is also affected by changes in the system parameters. Increasing the intensity of the laser field reduces the conductance due to the confinement of the fermions by the laser fields. In addition, increasing the size of the region where the magnetic field is applied reduces the conductance because the increased distance gives the fermions a greater chance of diffusion and increases their interaction with the magnetic field.

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来源期刊
Applied Physics A
Applied Physics A 工程技术-材料科学:综合
CiteScore
4.80
自引率
7.40%
发文量
964
审稿时长
38 days
期刊介绍: Applied Physics A publishes experimental and theoretical investigations in applied physics as regular articles, rapid communications, and invited papers. The distinguished 30-member Board of Editors reflects the interdisciplinary approach of the journal and ensures the highest quality of peer review.
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