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A first-principles study of the nernst effect in doped polymer

Chinese Chemical Letters 2024年第12期35卷 273-277页

作者： Shaohua Zhang Xiaojuan Dai Wei Hao Liyao Liu Yingqiao Ma Ye Zou Jia Zhu Chong-an Di Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China Laboratory of Theoretical and Computational Nanoscience CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyChinese Academy of SciencesBeijing 100190China

Since the discovery of the nernst effect in 19th century,it has been an important transverse thermoelectric charge transport phenomenon in solid *** polymers have recently attracted great attention as promising optoelectronic ***,the nernst effect is yet to be explored for conducting ***,we report the first theoretical investigations of the nernst effect in doped conducting polymers by first-principles calculations under the frame work of Fermi-liquid ***,the nernst coefficients of PBTTT are found to be ranging from 0.0029 to 0.039μV K^(-1)T^(-1).They are monotonically decreased with the doping level due to both much enhanced Fermi energy and the decreased charge mobility at high doping *** theoretical findings not only enhance our fundamental understanding of the doping mechanism that controls the charge transport properties of conducting polymers,but more importantly,they also offer initial predictions of the transverse thermoelectric conversion capability of conducting *** predictions are crucial for the development of future flexible thermoelectric applications based on the nernst effect.

关键词： nernst effect Fermi-liquid theory Conjugated polymers Theoretical calculation Doping mechanisms

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Electrical and thermoelectric study of two-dimensional crystal of NbSe2

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Chinese Physics B 2020年第8期29卷 137-142页

作者： Xin-Qi Li Zhi-Lin Li Jia-Ji Zhao Xiao-Song Wu State Key Laboratory for Artificial Microstructure and Mesoscopic Physics Beijing Key Laboratory of Quantum DevicesPeking UniversityBeijing 100871China Frontiers Science Center for Nano-optoelectronics and Collaborative Innovation Center of Quantum Matter Beijing 100871China

We report experimental investigation of the resistivity and nernst effect in two-dimensional(2D)NbSe2 crystals.A strongly enhanced nernst effect,100 times larger than that in bulk NbSe2,caused by moving vortices is observed in thin *** is found that in the low temperature,high magnetic field regime,pinning effects show little dependence on the thickness and resistivity of the superconductor *** nernst signals persist above the superconducting transition,suggesting that the nernst effect is a sensitive probe to superconducting fluctuations.A magnetic field induced superconductor-insulator transition(SIT)is evident,which is surprising in that such a SIT usually takes place in disordered dirty superconductors,while our samples are highly crystalline and close to the clean ***,our results expand the scope of SIT into 2D crystal clean superconductors.

关键词： two-dimensional superconductivity nernst effect superconducting fluctuations superconductor-insulator transition

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