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固有二阶信号产生感兴趣，并且也开始研究其他主题。例如，在传输测量中，对称性允许第二个谐波电压可以沿横向出现，而微观贡献之一来自费米能量在费米能量的频带结构的分散和动量空间中的浆果曲率分布。第二次谐波电压以及对称工程的这种测量将是我们在不久的将来的最新目标。为了使石墨烯异质结构进一步开发了转移技术，并在我们的实验室中引入了干pickup方法。此外，我们执行了极化的拉曼光谱，因此我们可以知道两种材料的方向，然后精确控制扭曲角度。在优化了石墨烯异质结构装置的制造过程之后，我们最终达到了大尺寸（千分尺尺寸）高品质的石墨烯界面，可以通过传输和光学元件来测量。在最后，我们观察到了石墨烯异质结构中的伪磁场效应，该磁场效应被转移并通过pristine cluse compry ry ry ry ry ryement ry ry ry ryement comply recyment。其次，我们观察到了相当不错的量子厅状态和良好的边缘运输现象。第三，我们在没有外部磁场的横向方向上观察到非线性信号，该信号起源于动量空间中费米表面的浆果曲率分布。

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