Zengyi Du

（杜增义）

duzengyi@hfnl.cn, 18715270872

WORKING and EDUCATION EXPERIENCE

2023.9-now            Staff Scientist

USTC, Hefei National Laboratory/USTC

Scanning Probe Microscopy study on complex quantum materials

2022.7-2023.6         Postdoctoral Associate

Department of Physics and Astronomy, Stony Brook University

Scanning Near Field Optics Microscopy (SNOM) study on 2D materials

Supervisor: Prof. Mengkun Liu

2018.6-2022.6         Research Associate

Condensed Matter Physics & Material Science Department, Brookhaven National Laboratory

Working on the STM module of Oxide_MBE-ARPES-SI_STM (OASIS) facility

Supervisor: Dr. Kazuhiro Fujita, Prof. J. C. Séamus Davis, and Prof. Abhay N. Pasupathy

2017.6-2018.6             Research Assistant

Department of Physics, Nanjing University

Project: Spectroscopic Imaging-Scanning Tunneling Microscopy on Quantum Materials

Supervisor: Prof. Hai-Hu Wen

2012.9-2017.5             Ph. D degree

Department of Physics, Nanjing University, Advisor: Prof. Hai-Hu Wen

Thesis: Scanning Tunneling Microscopy Studies on Ta₄Pd₃Te₁₆ and (Li_1-xFe_xOH)FeSe

Awards: National Scholarship 2016

2008.9-2012.7             Bachelor degree

Inner Mongolia University, Major: Physics, GPA ranking: 1/24

Awards:Outstanding student scholarship 2008-2012,National Scholarship 2011.

RESEARCH EXPERIENCE

Current Research Areas of Interests

·         Quantum materials,strong correlation systems and topological materials;

·         TMD materials and 2D device;

·         Scanning Tunneling Microscopy;

·         Ultrafast, near-field optics microscopy and spectroscopy;

Research Skills

·         STM: Spectroscopic-Imaging STM, MBE growth thin films, UHV system design, STM Probe design and building;

·         Scanning Near Field Optics Microscopy: Ultrafast and near-field infrared optics;

·         Numerical calculation: Calculation of the electronic structure by Green’s function, T-matrix and BdG equations, Quasiparticle Interference calculation and STM Image process.

·         Software: Matlab, Python, Labview and Solidworks;

PUBLICATIONS

2024

·         Zengyi Du et al., Discovery of charge density modulations at the van hove singularity of the extremely electron doped graphene,In preparation.

·         Zengyi Du et al., Visualizing McMillan Lock-In Commensuration of the Cuprate Density Wave State,To Be Submitted.

2023

·           Zengyi Du et al., Periodic Atomic Displacements and Visualization of the Electron-Lattice Interaction in the Cuprates,Physical Review X 13 021025 (2023)

·           M. Dapolito, M. Tsuneto, W. Zheng, L. Wehmeier, S. Xu, Z. Chen, J. Chen, Zengyi Du, et al., Infrared nano-imaging of Dirac magnetoexcitions in graphene, Nature Nanotechnology 18, 1409 (2023)

2022

·           Yangmu Li, A. Sapkota, P. M. Lozano, Zengyi Duet al, Strongly overdoped LaSrCuO: Evidence for Josephson-coupled grains of strongly correlated superconductor,Physical Review B 106, 224515 (2022).

·           Hui Li, Zengyi Du et al., Visualizing the unusual spectral weight transfer in DyBa₂Cu₃O_7−δ. Scientific Reports12, 830 (2022).

 2021

·         Zengyi Du, Hui Li and Kazuhiro Fujita, Atomic-Scale Visualization of the Cuprate Pair Density Wave State.J. Phys. Soc. Jpn. 90, 111003 (2021).

2020

·           Zengyi Du Hui Li, Sang Hyun Joo, Elizabeth P Donoway, Jinho Lee, JC Séamus Davis, Genda Gu, Peter D Johnson, Kazuhiro Fujita. Imaging the energy gap modulations of the cuprate pair-density-wave state.Nature 580 6570 (2020).

·         Peayush Choubey, Sang Hyun Joo, K. Fujita, Zengyi Du, S. D. Edkins, M. H. Hamidian, H. Eisaki, S. Uchida, A. P. Mackenzie, Jinho Lee, J.C. Séamus Davis, P.J. Hirschfeld. Atomic-scale Electronic Structure of the Cuprate Pair Density Wave State Coexisting with Superconductivity. PNAS 117, 14805 (2020).

·           Kazuhiro Fujita, Illya Drozdov, Zengyi Du, Hui Li, Sang-Hyun Joo, Jinho Lee, Genda Gu, Peter D. Johnson, and Tonic Valla. A combined SI-STM and ARPES study of different gaps measured in the Cuprate Phase Diagram. Physical Review B 101, 045136 (2020).

·           Ze-Bin Wu, Daniel Putzky, Asish K. Kundu, Hui Li, Shize Yang, Zengyi Du, Sang Hyun Joo, Jinho Lee, Yimei Zhu, Gennady Logvenov, Bernhard Keimer, Kazuhiro Fujita, Tonica Valla, Ivan Božovic, and Ilya K. Drozdov, Homogeneous superconducting gap in DyBa₂Cu₃O_7−δsynthesized by oxide molecular beam epitaxy, Phys. Rev. Mat., 4, 124801 (2020).

2019

·         Qiangqiang Gu, Siyuan Wan, Qingkun Tang, Zengyi Du, Huan Yang, Qiang-Hua Wang, Ruidan Zhong, Jinsheng Wen, G.D. Gu, and Hai-Hu Wen, Directly visualizing the sign change of d-wave superconducting gap in Bi2212 by phase-referenced quasiparticle interference,Nature Communications 10 1603 (2019).

·         Mingyang Chen, Qingkun Tang, Xiaoyu Chen, Qiangqiang Gu, Huan Yang, Zengyi Du, Xiyu Zhu, Enyu Wang, Qiang-Hua Wang, and Hai-Hu Wen, Direct visualization of sign-reversal s± superconducting gaps in FeTe_0.55Se_0.45, Physical Review B 99, 014507 (2019).

2018

·           Zengyi Du, Xiong Yang,Dustin Altenfeld, Qiangqiang Gu, Huan Yang, Ilya Eremin, Peter J. Hirschfeld, Igor I. Mazin, Hai Lin, Xiyu Zhu, and Hai-Hu Wen.Experimental Demonstration of the Sign Reversal of the Order Parameter in (Li_1-xFe_x)OHFe_1-yZn_ySe. Nature Physics 14 134 (2018).

·         Mingyang Chen, Xiaoyu Chen, Huan Yang, Zengyi Du, Xiyu Zhu, Enyu Wang, and Hai-Hu Wen, Discrete energy levels of Caroli-de Gennes-Matricon states in quantum limit in FeTe_0.55Se_0.45, Nature Communications 9, 970 (2018).

·         Mingyang Chen, Xiaoyu Chen, Huan Yang, Zengyi Du, and Hai-Hu Wen, Superconductivity with twofold symmetry in Bi₂Te₃/FeTe_0.55Se_0.45 heterostructures. Science Advances 4, eaat1084 (2018).

·         Qiangqiang Gu, Qingkun Tang, Siyuan Wan, Zengyi Du, Xiong Yang, Huan Yang, Qiang-Hua Wang, Hai Lin, Xiyu Zhu, and Hai-Hu Wen, Sign-reversal superconducting gaps revealed by phase-referenced quasiparticle interference of impurity-induced bound states in (Li_1-xFe_x)OHFe_1-yZn_ySe, Physical Review B 98, 134503 (2018).

·         Xiong Yang, Zengyi Du, Hai Lin, Delong Fang, Huan Yang, Xiyu Zhu, and Hai-Hu Wen. Vortex lattice and vortex bound states in CsFe2As2 investigated by scanning tunneling microscopy/spectroscopy.Physical Review B 98 024505(2018).

2017

·         Guan Du, Jifeng Shao, Xiong Yang, Zengyi Du, Delong Fang, Changjing Zhang, Jinghui Wang, Kejing Ran, Jinsheng Wen, Huan Yang, Yuheng Zhang, Hai-Hu Wen. Drive the Dirac Electrons into Cooper Pairs in Sr_xBi₂Se₃. Nature Communication8 14466 (2017)

2016

·          Zengyi Du, Xiong Yang, Hai Lin, Delong Fang, Guan Du, Jie Xing, Huan Yang, Xiyu Zhu, Hai-Hu Wen. Scrutinizing the double superconducting gaps and strong coupling pairing in (Li_1-xFe_x)OHFeSe. Nature Communications 7 10565 (2016).

·         Xiong Yang, Zengyi Du, Guan Du, Qiangqiang Gu, Hai Lin, Delong Fang, Huan Yang, Xiyu Zhu, Hai-Hu Wen. Strong coupling superconductivity revealed by scanning tunneling microscope in tetragonal FeS. Physical Review B 94 024521(2016).

·         Huan Yang, Jie Xing, Zengyi Du, Xiong Yang, Hai Lin, Delong Fang, Xiyu Zhu, Hai-Hu Wen. Possible superconducting fluctuation and pseudogap state above Tc in CsFe₂As₂. Physical Review B 93 224516 (2016).

2015

·         Zengyi Du, Delong Fang, Zhenyu Wang, Yufeng Li, Guan Du, Huan Yang, Xiyu Zhu, Hai-Hu Wen. Anisotropic Superconducting Gap and Elongated Vortices with Caroli-De-Gennes-Matricon States in the New Superconductor Ta₄Pd₃Te₁₆. Scientific Reports5 9408 (2015).

·         Zengyi Du, Delong Fang, Zhenyu Wang, Guan Du, Xiong Yang, Huan Yang, Gen-Da Gu, Hai-Hu Wen. Investigation of scanning tunneling spectra on iron-based superconductor FeSe_0.5Te_0.5.Acta Physica Sinica64 097401(2015).

·         Guan Du, Zengyi Du, Delong Fang, Huan Yang, R. D. Zhong, J. Schneeloch, G. D. Gu, Hai-Hu Wen. Fully gapped superconductivity in In-doped topological crystalline insulator Pb_0.5Sn_0.5Te. Physical Review B 92 020512(2015)

·         Delong Fang, Xun Shi, Zengyi Du, Pierre Richard, Huan Yang, X. X. Wu, Peng Zhang, Tian Qian, Xiaxin Ding, Zhenyu Wang, T. K. Kim, M. Hoesch, Aifeng Wang, Xianhui Chen, Jiangping Hu, Hong Ding, and Hai-Hu Wen. Observation of a Van Hove singularity and implication for strong-coupling induced Cooper pairing in KFe₂As₂.Physical Review B 92 144513(2015).

2014

·         Jianzhong Liu, Delong Fang, Zhenyu Wang, Jie Xing, Zengyi Du, Xiyu Zhu, Huan Yang, Hai-Hu Wen. Unexpected Giant Superconducting Fluctuation and Anomalous Semiconducting Normal State in NdO_1-xF_xBi_1-yS₂ Single Crystals. Europhysics Letters 106 67002(2014).

CONFERENCES & SEMINARS

·      Gordon Research Conference, May 2015, Hong Kong, China.

Poster Section, “Anisotropic Superconducting Gap and Elongated Vortices with Caroli-De- Gennes-Matricon States in the New Superconductor Ta4Pd3Te16”

·      APS March Meeting, March 2017, New Orleans, USA.

Contribution talk, S41.00009, “Sign Reversal Superconducting Gaps in Electron Fermi Surface Dominated System (Li1−xFexOH)FeSe”

·      Hamburg University, July 2017, Hamburg, Germany.

Invited talk, “Sign Reversal Superconducting Gaps in Electron Fermi Surface Dominated Iron Chalcogenide Superconductor (Li_1-xFe_x)OHFeSe”

·      ShanghaiTech University, May 2018, Shanghai, China.

Invited talk, “Determination of the Superconducting Gap by Phase related Quasiparticle Interference analyses in both Cuprate and Iron based Superconductors”

·      Institute of physics, Chinese academy sciences, July 2020, International Young Scholar Forum.

Invited talk, ‘Visualizing the Cuprate Pair Density Wave State’

·      Westlake university, October 2020, Hangzhou.

Invited talk, ‘Spectroscopic Imaging-Scanning Tunneling Microscopy Study on High Tc Superconductors’

·      APS March Meeting, March 2021, USA.

    Contribution talk, J47.00005, ‘Visualizing the Cuprate Pair Density Wave State’

·    M2S HTSC, July 2022, Canada

Invited talk, ‘Visualization of Electron-Lattice Interactions in the Cuprate Supercondcutor’

·      APS March Meeting, March 2023, USA.

    Contribution talk, G44.00004, ‘Nano-photocurrent in Twisted Bilayer Graphene by Magneto-SNOM’

JOURNAL SERVICE

·         Reviewer for journals: Physica C: superconductivity and its application, Journal of Physics: Condensed Matter, npj quantum materials, Nature

·         Guest editor: Frontiers in Physic