遷移金属カルコゲナイドナノチューブにおける量子輸送現象

过渡金属硫族化物纳米管中的量子输运现象

• 批准号: 18J14154
• 负责人: 秦 峰
• 金额: $ 1.34万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2018
• 资助国家: 日本
• 起止时间: 2018-04-25 至 2020-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18J14154/
• 关键词: graphene; heterostructure; nonreciprocal; nonlinear; TMD material; nanotube; superconductivity; ionic liquid gating; intercalation; Little-Parks oscillation; diameter-dependent; curvature

This year, we are interested in such intrinsic second order signal generation in other different materials and also start to work on other topics. For example, in transport measurement, the symmetry allows that the second harmonic voltage could appear in transvers direction, and one of the microscopically contribution is from both the dispersion of band structure at the Fermi energy and the Berry curvature distribution in the momentum space. Such measurement of second harmonic voltage and also the symmetry engineering will be our recent goal in the near future.In order to make graphene heterostructure, we have further developed our transfer technique and introduce dry pickup method in our lab. Furthermore, we carry out the polarized Raman spectrum and so that we could know the orientation of both materials and then precisely control the twisted angle. After optimize the fabrication process of graphene heterostructure device, we have finally achieve large size (tens micrometer size) high quality graphene interface, which can be measured by both transport and optics.Finally, we observed pseudo magnetic field effect in graphene heterostructure, the shifted and thus duplicated the Landau fan diagram of pristine graphene into two branches, governed by time reversal symmetry. Second, we observed pretty good quantum Hall state and good edge transport phenomena. Third, we observed nonlinear signal in transverse direction without external magnetic field, originated from Berry curvature distribution at the Fermi surface in the momentum space.

今年，我们对其他不同材料中的这种固有二阶信号生成感兴趣，并开始研究其他主题。例如，在输运测量中，对称性使得二次谐波电压可以出现在横向，微观上的贡献之一是费米能带结构的色散和动量空间中的贝里曲率分布。这种二次谐波电压的测量以及对称工程将是我们在不久的将来的目标。为了制造石墨烯异质结构，我们进一步发展了我们的转移技术并在我们的实验室引入了干拾取方法。此外，我们还进行了偏振拉曼光谱，这样我们就可以知道两种材料的取向，然后精确控制扭曲角度。经过优化石墨烯异质结构器件的制作工艺，我们最终实现了大尺寸（数十微米尺寸）高质量的石墨烯界面，可以通过传输和光学测量。最后，我们观察到石墨烯异质结构中的赝磁场效应，位移从而将原始石墨烯的朗道扇形图复制成两个分支，由时间反转对称性控制。其次，我们观察到相当好的量子霍尔态和良好的边缘传输现象。第三，我们在没有外部磁场的情况下观察到了横向的非线性信号，该信号源自动量空间中费米表面的贝里曲率分布。

项目成果

Superconductivity in Individal Chiral WS2 Nanotubes

单个手性 WS2 纳米管的超导性

• 发表时间: 2018
• 作者: F. Qin;T. Ideue;W. Shi;M. Yoshida;A. Zak;R. Tenne;T. Kikitsu;D. Inoue;D. Hashizume & Y. Iwasa
• 通讯作者: D. Hashizume & Y. Iwasa

Optoelectronic response of a WS2 tubular p-n junction

• DOI: 10.1088/2053-1583/aab670
• 发表时间: 2018-04
• 期刊: 2D Materials
• 影响因子: 5.5
• 作者: Yijin Zhang;M. Onga;Feng Qin;Wu Shi;A. Zak;R. Tenne;J. H. Smet;Yoshihiro Iwasa

Diameter-dependent critical temperature of superconductivity in individual WS2 nanotubes

单个 WS2 纳米管的超导临界温度与直径相关

• 发表时间: 2019
• 作者: Feng Qin;Toshiya Ideue;Wu Shi;Xiao-xiao Zhang;Masaro Yoshida;Alla Zak;Reshef Tenne;Tomoka Kikitsu;Daishi Inoue;Daisuke Hashizume;Yoshihiro Iwasa
• 通讯作者: Yoshihiro Iwasa

Enhanced intrinsic photovoltaic effect in tungsten disulfide nanotubes

• DOI: 10.1038/s41586-019-1303-3
• 发表时间: 2019-06
• 期刊: Nature
• 影响因子: 64.8
• 作者: Yijin Zhang;Yijin Zhang;T. Ideue;M. Onga;Feng Qin;R. Suzuki;Alla Zak;R. Tenne;J. H. Smet-J.-H.-S

Superconductivity in a Chiral WS2 Nanotube

手性 WS2 纳米管中的超导性

• 发表时间: 2018
• 作者: F. Qin;T. Ideue;W. Shi;M. Yoshida;A. Zak;R. Tenne;T. Kikitsu;D. Inoue;D. Hashizume & Y. Iwasa
• 通讯作者: D. Hashizume & Y. Iwasa