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Conformal mapping and shot noise in graphene

机译:石墨烯中的共形映射和散粒噪声

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摘要

Ballistic transport through a collection of quantum billiards in undoped graphene is studied analytically within the conformal mapping technique. The billiards show pseudodiffusive behavior, with the conductance equal to that of a classical conductor characterized by the conductivity σ_0=4e~2/πh and the Fano factor F = 1/3. By shrinking at least one of the billiard openings, we observe a tunneling behavior, where the conductance shows a power-law decay with the system size, and the shot noise is Poissonian (F= 1). In the crossover region between tunneling and pseudodiffusive regimes, the conductance G≈(1 -F) ×se~2/h. The degeneracy s=8 for the Corbino disk, which preserves the full symmetry of the Dirac equation, s=4 for billiards bounded with smooth edges which break the symplectic symmetry, and s=2 when abrupt edges lead to strong interval-ley scattering. An alternative, analytical, or numerical technique is utilized for each of the billiards to confirm the applicability of the conformal mapping for various boundary conditions.
机译:通过保形映射技术对未掺杂石墨烯中的量子台球的弹道传输进行了分析研究。台球表现出伪扩散行为,其电导率等于经典导体的电导率,其特征在于电导率σ_0= 4e〜2 /πh和Fano因子F = 1/3。通过缩小至少一个台球开口,我们观察到了隧穿行为,其中电导随系统尺寸显示出幂律衰减,散粒噪声为泊松(F = 1)。在隧穿与伪扩散区的交叉区域,电导率G≈(1-F)×se〜2 / h。 Corbino圆盘的简并度s = 8,它保留了狄拉克方程的完全对称性,对于有光滑边缘且破坏辛对称性的台球,s = 4,而突然边缘导致强烈的间隔利于散射时,s = 2。对于每个台球,都使用一种替代的,分析的或数字技术来确认保形映射在各种边界条件下的适用性。

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  • 来源
    《Physical review》 |2009年第12期|125417.1-125417.14|共14页
  • 作者单位

    Marian Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, PL-30059 Krakow, Poland Institut fuer Theoretische Physik, Universitat Regensburg, D-93040 Regensburg, Germany;

    Institut fuer Theoretische Physik und Astrophysik, Universitat Wurzburg, Am Hubland, D-97074 Wurzburg, Germany;

    Institut fuer Theoretische Physik, Universitat Regensburg, D-93040 Regensburg, Germany Instituut-Lorentz, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands;

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  • 正文语种 eng
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  • 关键词

    noise processes and phenomena; ballistic transport; electronic transport in nanoscale materials and structures;

    机译:噪声过程和现象;弹道运输;纳米级材料和结构中的电子传输;

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