Introduction to the atomistic Green’s function approach: application to nanoscale
            phonon transport

Hu, Renjiu; Dai, Jinghang; Tian, Zhiting

doi:10.1088/978-0-7503-1738-2ch4

Cited by 2 publications

(3 citation statements)

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“…In the cross-sectional surveys, convenient sampling and snowball sampling methods were used to recruit people in mainland of China, and electronic questionnaires were designed using the “So Jump” online platform 1 ( 21 ). WeChat and QQ, the most widely used instant messaging tools in mainland of China, were used to distribute questionnaires from February to March 2021 and from December 2022 to January 2023.…”

Section: Methodsmentioning

confidence: 99%

Association of self-leadership and epidemic risk perception on quality of life in post-pandemic mainland of China: a cross-sectional study

Ren,

Zhu,

et al. 2024

Front. Public Health

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BackgroundSelf-leadership has proven to adjust individual psychological states and promote active behaviors to mitigate stress perception and negative lifestyle. This study aims to investigate the relationship between self-leadership, epidemic risk perception, and quality of life among the general public in post-pandemic mainland of China.MethodsTwo online self-reported questionnaire surveys were carried out with 3,098 and 469 people in the Chinese mainland in February 2021 and December 2022, respectively. The univariate analysis, structural equation modeling, and fuzzy-set qualitative comparative analysis were used to analyze the data which was collected by Revised Self-Leadership Questionnaire, Perceived Risk of COVID-19 Pandemic Scale and World Health Organization Quality of Life Brief Scale.ResultsThe Self-leadership was directly, moderately, and positively correlated with quality of life (Standardized path coefficients: 0.383 and 0.491, respectively; p < 0.05), and epidemic risk perception was negatively correlated with quality of life (Standardized path: 0.068 and 0.120, respectively; p < 0.05). The structural equation model for self-leadership, epidemic risk perception, and quality of life had a good fit (CFI = 0.957, 0.939 > 0.9; RSMEA = 0.058, 0.064 < 0.08, respectively) and was consistent across genders, educational levels, and types of occupations (Delata-CFI < 0.01). The core condition for achieving a high quality of life lies in maintaining a low level of self-punishment and a high level of self-cueing or a high level of self-punishment and a low level of self-cueing.ConclusionIn the post-epidemic era, the public can adjust their attitude toward stress by enhancing their self-leadership skills. Among various self-leadership skills, self-punishment or self-cueing may have the most significant impact on the quality of life.

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Section: Methodsmentioning

confidence: 99%

Association of self-leadership and epidemic risk perception on quality of life in post-pandemic mainland of China: a cross-sectional study

Ren,

Zhu,

et al. 2024

Front. Public Health

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“…with Δr 𝑖,𝑗 = r 𝑖 − r 𝑗 as the distance between the i th and j th atoms, and k as the wave vector. To calculate the phononic density of states or vDOS, with v as vibrational, one can use vDOS = − 2𝜔 𝜋 Im[Trace(𝐺(𝜔))], within Green's function method [37,38], or by using Gaussian smearing of the Dirac Delta [7]:…”

Section: Model and Methodsmentioning

confidence: 99%

“…Phononic band structure can be obtained by solving the following eigenvalue problem 36 : with as the distance between the i th and j th atoms, and as the wave vector. To calculate the phononic density of states or vDOS, with v as vibrational, one can use within Green’s function method 37 , 38 , or by using Gaussian smearing of the Dirac Delta 7 : with as band index of the phonon, as wave vector, and is a small positive number. By having the transmission function, one can obtain vibrational conductance as 11 : …”

Section: Model and Methodsmentioning

confidence: 99%

Tuning phononic and electronic contributions of thermoelectric in defected S-shape graphene nanoribbons

Bazrafshan

Khoeini

2022

Sci Rep

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Thermoelectrics as a way to use waste heat, is essential in electronic industries, but its low performance at operational temperatures makes it inappropriate in practical applications. Tailoring graphene can change its properties. In this work, we are interested in studying the transport properties of S-shape graphene structures with the single vacancy (SV) and double vacancy (DV) models. The structures are composed of a chiral part, which is an armchair graphene nanoribbon, and two zigzag graphene ribbons. We investigate the changes in the figure of merit by means of the Seebeck coefficient, electronic conductance, and electronic and phononic conductances with the vacancies in different device sizes. The transport properties of the system are studied by using the non-equilibrium Green’s function method, so that the related Hamiltonians (dynamical matrices) are obtained from the tight-binding (force constant) model. The maximum figure of merit (ZT) obtains for the DVs in all lengths. Physical properties of such a system can be tuned by controlling various parameters such as the location and the type of the defects, and the device size. Our findings show that lengthening the structure can reduce phononic contribution, and single vacancies than double vacancies can better distinguish between electronic thermal conductance behavior and electronic conductance one. Namely, vacancy engineering can significantly increase thermoelectric performance. In the large devices, the SVs can increase the ZT up to 2.5 times.

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Introduction to the atomistic Green’s function approach: application to nanoscale phonon transport

Cited by 2 publications

References 0 publications

Association of self-leadership and epidemic risk perception on quality of life in post-pandemic mainland of China: a cross-sectional study

Association of self-leadership and epidemic risk perception on quality of life in post-pandemic mainland of China: a cross-sectional study

Tuning phononic and electronic contributions of thermoelectric in defected S-shape graphene nanoribbons

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