α- t3corbino盘的电导特性

IF 2.6 4区 物理与天体物理 Q3 PHYSICS, CONDENSED MATTER
Mijanur Islam, Saurabh Basu
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引用次数: 0

摘要

在这项工作中,我们研究了一个以Corbino盘形式存在的α- t3晶格,其特征是内外半径为ir1andr2,并由可调谐磁通螺纹连接。通过对平稳Dirac-Weyl方程的精确(解析)解,我们计算了载流子的传输概率,从而获得了0α (α表示中心原子与其他两个原子之一之间的跳跃强度)的电导特征,从而确定了平带的作用,并仔细研究了从石墨烯到骰子晶格的传输特征。我们的结果揭示了电导中的周期性Aharonov-Bohm (AB)振荡,这让人想起了Corbino盘作为电子泵的实用性。此外,这些结果还受到掺杂水平、内外半径比、磁通和α等参数的强烈影响。此外,当α值越小、半径比越大时,复杂的量子干涉效应会导致电导中可能出现高谐波模式和劈峰结构。我们还发现,远离电荷中性点(零掺杂),电导振荡对各种参数更加明显和敏感,相应的行为在很大程度上由倏逝波输运控制。此外,Fano因子揭示了不同的输运机制,在α α = 1时从泊松态过渡到伪扩散态。因此,该装置为研究平带系统中量子霍尔电流和AB振荡的产生提供了肥沃的土壤,同时也展示了电子传输中高次谐波的复杂外观。最后,为了正确地看待问题,我们将我们的结果与石墨烯磁盘的结果进行了比较,突出了两者在器件应用方面的差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Conductance properties ofα-T3Corbino disks.

In this work, we investigate anα-T3lattice in the form of a Corbino disk, characterized by inner and outer radiiR1andR2, threaded by a tunable magnetic flux. Through exact (analytic) solution of the stationary Dirac-Weyl equation, we compute the transmission probability of the carriers and hence obtain the conductance features for0<α⩽1(αdenotes the strength of the hopping between the central atom and one of the other two) which allows ascertaining the role of the flat band, alongwith scrutinizing the transport features from graphene to a dice lattice. Our results reveal periodic Aharonov-Bohm (AB) oscillations in the conductance, reminiscent of the utility of the Corbino disk as an electron pump. Further, these results are strongly influenced by parameters, such as, doping level, ratio of the inner and outer radii, magnetic flux, andα. Additionally, complex quantum interference effect resulting in the possible emergence of higher harmonic modes and split-peak structures in the conductance, become prominent for smallerαvalues and larger ratios of the radii. We also find that, away from the charge-neutrality point (zero doping), the conductance oscillations are more pronounced and sensitive to the various parameters, with the corresponding behavior largely governed via the evanescent wave transport. Further, the Fano factor reveals distinct transport regimes, transitioning from Poissonian to pseudo-diffusive forα < 1, and from ballistic to pseudo-diffusive at the dice limit (α = 1). Thus, this setup serves as a fertile ground for studying the generation of quantum Hall current and AB oscillations in a flat band system, alongwith demonstrating intricate appearance of higher harmonics in the electron transport. Finally, to put things in perspective, we have compared our results with those for graphene disks that highlight the difference between the two with regard to device applications.

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来源期刊
Journal of Physics: Condensed Matter
Journal of Physics: Condensed Matter 物理-物理:凝聚态物理
CiteScore
5.30
自引率
7.40%
发文量
1288
审稿时长
2.1 months
期刊介绍: Journal of Physics: Condensed Matter covers the whole of condensed matter physics including soft condensed matter and nanostructures. Papers may report experimental, theoretical and simulation studies. Note that papers must contain fundamental condensed matter science: papers reporting methods of materials preparation or properties of materials without novel condensed matter content will not be accepted.
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