Tuning electronic and thermoelectric properties of armchair graphene nanoribbon in the presence of electron phonon coupling

IF 2.1 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

Solid State Communications Pub Date : 2024-09-03 DOI:10.1016/j.ssc.2024.115682

T. Kakavandi, H. Rezania

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Abstract

Electronic and thermoelectric properties of armchair graphene nanoribbon taking into account the effects of interaction between electrons and Einstein phonons have been addressed. Specially we study the temperature dependence of thermal conductivity, density of states and specific heat of the structure. The effects of electron phonon coupling strength on thermal conductivity and thermoelectric electronic of the system have been studied. Green’s function method has been implemented to obtain electronic properties of the system in the context of Holstein Hamiltonian. One loop electronic self-energy of the Hamiltonian has been obtained in order to find interacting electronic Green’s function. The transport and thermoelectric properties of armchair graphene nanoribbon in the presence of electron phonon coupling can be readily found using interacting Green’s function based on Kubo formula. We find numerical results for chemical potential dependence of thermal conductivity and thermoelectric properties in the presence of Holstein phonons. Specially the behaviors of Seebeck coefficient, power factor function, figure of merit and Lorenz number of the system have been analyzed. Our results show turning on electron phonon coupling leads to reduction of band gap in density of states of the armchair nanoribbon.

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在电子声子耦合作用下调谐扶手石墨烯纳米带的电子和热电特性

考虑到电子和爱因斯坦声子之间相互作用的影响，我们研究了扶手石墨烯纳米带的电子和热电特性。我们特别研究了该结构的热导率、状态密度和比热的温度依赖性。我们还研究了电子声子耦合强度对系统热导率和热电电子的影响。采用格林函数法获得了霍尔斯泰因汉密尔顿系统的电子特性。为了找到相互作用的电子格林函数，还获得了哈密顿的一环电子自能。利用基于 Kubo 公式的相互作用格林函数，可以很容易地找到存在电子声子耦合的扶手石墨烯纳米带的传输和热电特性。我们发现了霍尔施泰因声子存在时热导率和热电性能的化学势依赖性数值结果。我们特别分析了系统的塞贝克系数、功率因数函数、优点系数和洛伦兹数的行为。我们的研究结果表明，开启电子声子耦合会导致扶手纳米带的带隙减小。

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来源期刊

Solid State Communications 物理-物理：凝聚态物理

CiteScore

3.40

自引率

4.80%

发文量

287

审稿时长

51 days

期刊介绍： Solid State Communications is an international medium for the publication of short communications and original research articles on significant developments in condensed matter science, giving scientists immediate access to important, recently completed work. The journal publishes original experimental and theoretical research on the physical and chemical properties of solids and other condensed systems and also on their preparation. The submission of manuscripts reporting research on the basic physics of materials science and devices, as well as of state-of-the-art microstructures and nanostructures, is encouraged. A coherent quantitative treatment emphasizing new physics is expected rather than a simple accumulation of experimental data. Consistent with these aims, the short communications should be kept concise and short, usually not longer than six printed pages. The number of figures and tables should also be kept to a minimum. Solid State Communications now also welcomes original research articles without length restrictions. The Fast-Track section of Solid State Communications is the venue for very rapid publication of short communications on significant developments in condensed matter science. The goal is to offer the broad condensed matter community quick and immediate access to publish recently completed papers in research areas that are rapidly evolving and in which there are developments with great potential impact.