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Category: Previous Postdocs

Yuya Ominato (大凑 友也）

Photo Ominato Yuya white

 

 

 

Position

Postdoctoral Fellow (2019-2023)

View Dr. Y. Ominato's CV

 

 

Education

Mar. 2011, B.S., Physics, Tohoku University
Mar. 2013, M.S., Physics, Tohoku University
Mar. 2016, Ph.D. Physics, Tohoku University

 

 

Professional Experience

Apr. 2016-Mar. 2019, Postdoctoral Researcher, IMR, Tohoku University

Apr. 2019-present, Postdoctoral Fellow, Kavli ITS, UCAS

 

 

Research Activities

Spin quantum transport

 

 

Publication

(Refereed Journal)

[1] Y. Ominato and M. Koshino, Orbital magnetic susceptibility of finite-sized graphene, Physical Review B 85, 165454 (2012)

[2] Y. Ominato and M. Koshino, Orbital magnetism of grapheme flakes, Physical Review B 87, 115433 (2013)

[3] Y. Ominato and M. Koshino, Orbital magnetism of grapheme nanostructures, Solid State Communications 175-176, 51 (2013)

[4] Y. Ominato and M. Koshino, Quantum transport in three-dimensional Weyl electron system, Physical Review B 89, 054202 (2014)

[5] Y. Ominato and M. Koshino, Quantum transport in three-dimensional Weyl electron system in the presence of charged impurity scattering, Physical Review B 91, 035202 (2015)

[6] Y. Ominato and M. Koshino, Magnetotransport in Weyl semimetals in the quantum limit: Role of topological surface states, Physical Review B 93, 245304 (2016)

[7] Y. Ominato, K. Kobayashi, and K. Nomura, Anisotropic magnetotransport in Dirac-Weylmagnetic junctions, Physical Review B 95, 085308 (2017)

[8] K. Kobayashi, Y. Ominato, and K. Nomura, Helicity-protected domain-wall magnetoresistance in ferromagnetic Weyl semimetal, J. Phys. Soc. Jpn. 87, 073707 (2018)

[9] Y. Ominato and K. Nomura, Spin susceptibility of three-dimensional Dirac semimetals, Physical Review B 97, 245207 (2018)

[10] Y. Ominato, A. Yamakage, and K. Nomura, Electric Polarization in Magnetic Topological Nodal Semimetal Thin Films, Condens. Matter 2018, 3(4), 43

 

 

 

 

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Category: Previous Postdocs

Ching-Kai Chiu （邱靖凯）

 

Ching Kai Chiu2

 

Position 

Postdoctor (2018 - 2020) 

 

 

Education

2007-2013 Ph. D. in Physics

University of Illinois at Urbana-Champaign

 

2002-2006, B. S. in Physics & Mathematics

National Taiwan University

 

 

Experiences

2018-2020  Postdoctoral Researcher

Kavli ITS, UCAS

2015-2018  Postdoctoral Researcher

University of Maryland

2013-2015  Postdoctoral Fellowship

University of British Columbia

 

 

Publications

1. *Classi cation of topological insulators and superconductors in the presence of re ection symmetry, Ching-Kai Chiu, Hong Yao, and Shinsei Ryu, Phys. Rev. B, 88, 075142 (2013) 

2. *Classi cation of re ection symmetry protected topological semimetals and nodal superconductors, Ching-Kai Chiu and Andreas P. Schnyder, Phys. Rev. B, 90, 205136 (2014) 

3. *Topological nodal-line fermions in the non-centrosymmetric superconductor
compound PbTaSe2, Guang Bian, Tay-Rong Chang, Raman Sankar, Su-Yang Xu, Hao Zheng, Titus Neupert, Ching-Kai Chiu, Shin-Ming Huang, Guoqing Chang, Ilya Belopolski, Daniel S.Sanchez, Madhab Neupane, Nasser Alidoust, Chang Liu, BaoKai Wang, Chi-Cheng Lee, Horng-Tay Jeng, Arun Bansil, Fang- cheng Chou, Hsin Lin, M. Zahid Hasan, Nat. Commun. 7, 10556 (2016) 

4. *Topological semi-metals with line nodes and drumhead surface states, Y.-H. Chan, Ching-Kai Chiu, M. Y. Chou, Andreas P. Schnyder, Phys. Rev. B 93, 205132 (2016) (Editors' Suggestion)

5. * Classi cation of topological quantum matter with symmetries, Ching-Kai Chiu, Andreas P. Schnyder, Je rey C. T. Teo and Shinsei Ryu, Rev. Mod. Phys. 88, 035005 (2016)

6. Symmetries, Dimensions, and Topological Insulators: the Mechanism Behind the Face of the Bott clock, Michael Stone, Ching-Kai Chiu, and Abhishek Roy, J. Phys. A: Math. Theor. 44 045001(2011).

7. Vortex Lines in Topological-Insulator Heterostructures, Ching-Kai Chiu, Taylor L. Hughes, and Matthew J. Gilbert, Phys. Rev. B 84, 144507 (2011).

8. Stabilization of Majorana Modes in Vortices in the Superconducting Phase of
Topological Insulators Using Topologically Trivial Bands, Ching-Kai Chiu, Pou-yan Ghaemi, and Taylor L. Hughes, Phys. Rev. Lett., 104, 237009 (2012)

9. Tuning between singlet, triplet, and mixed pairing states in an extended Hubbard chain, Kuei Sun, Ching-Kai Chiu, Hsiang-Hsuan Hung, and Jiansheng Wu, Phys. Rev. B, 89, 104519 (2014)

10. Majorana fermion exchange in strictly one dimensional structures, Ching-Kai Chiu, M.M. Vazifeh, and M. Franz, EPL 110 (2015) 10001 (Editor's Choice) 

11. Strongly interacting Majorana fermions, Ching-Kai Chiu, D. I. Pikulin and M. Franz, Phys. Rev. B 91, 165402 (2015)

12. Classi cation of crystalline topological semimetals with an application to Na3Bi, Ching-Kai Chiu and Andreas P. Schnyder, Proceedings of the International Workshop on Dirac Electrons in Solids 2015

13. Multiple signatures of topological transitions for interacting fermions in chain lattices, Y.-H. Chan, Ching-Kai Chiu, and Kuei Sun, Phys. Rev. B 92, 104514 (2015)

14. Interaction-enabled topological phases in topological insulator-superconductor het-erostructures, D. I. Pikulin, Ching-Kai Chiu, Xiaoyu Zhu, M. Franz, Phys. Rev. B 92, 075438 (2015)

15. Practical new platform for interaction-enabled topological phases, Ching-Kai Chiu, D, I. Pikulin and M. Franz, Phys. Rev. B 92, 241115(R) (2015)

16. Drumhead Surface States and Topological Nodal-Line Fermions in TlTaSe2, Guang Bian, Tay-Rong Chang, Hao Zheng, Saavanth Velury, Su-Yang Xu, Titus Neupert, Ching-Kai Chiu, Daniel S. Sanchez, Ilya Belopolski, Nasser Alidoust, Peng-Jen Chen, Guoqing Chang, Arun Bansil, Horng-Tay Jeng, Hsin Lin, M. Zahid Hasan, Phys. Rev. B 93, 121113(R) (2016)

17. Induced spectral gap and pairing correlations from superconducting proximity e ect, Ching-Kai Chiu, William S. Cole, and S. S. Das Sarma, Phys. Rev. B 94, 125304 (2016)

18. Type-II Dirac surface states in topological crystalline insulators, Ching-Kai Chiu, Y.-H. Chan, Xiao Li, Y. Nohara, and A. P. Schnyder, Phys. Rev. B 95, 035151 (2017) (Editors' Suggestion

19. Engineering of many-body Majorana states in a topological insulator/s-wave su-perconductor heterostructure, Hsiang-Hsuan Hung, Jiangsheng Wu, Kuei Sun, and Ching-Kai Chiu, Sci. Rep. 7, 3499 (2017) 

20. Conductance of a superconducting Coulomb blockaded Majorana nanowire, Ching-Kai Chiu, Jay D. Sau, S. Das Sarma, Phys. Rev. B 96, 054504 (2017)

21. Conductance interference in a superconducting Coulomb blockaded Majorana
ring, Ching-Kai Chiu, Jay D. Sau, S. Das Sarma, Phys. Rev. B 97, 035310

Preprints

1. Nontrivial surface topological physics from strong and weak topological insulators and superconductors, Ching-Kai Chiu, arXiv:1410.1117

2. Chiral Majorana Fermion Modes on the Surface of Superconducting Topological Insulators, Ching-Kai Chiu, Guang Bian, Hao Zheng, Jiaxin Yin, Songtian S. Zhang, Su-Yang Xu, and M. Zahid Hasan, arXiv:1612.09276 (submit to EPL)

3. Helical Majorana edge mode in a superconducting antiferromagnetic quantum spin Hall insulator, Yingyi Huang and Ching-Kai Chiu, arXiv:1708.05724 (sub- mit to PRL)

4. Topological band crossings in hexagonal materials, Jonathan Zhang, Y.-H. Chan, Ching-Kai Chiu, Maia G. Vergniory, Leslie M. Schoop, Andreas P. Schnyder, arXiv:1805.05120 (accepted by PR Materials)

5. Fractional Josephson E ect with and without Majorana Zero Modes, Ching-Kai Chiu, S. Das Sarma, arXiv:1806.02224 (submit to PRB)

 

 

Contact

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Category: Previous Postdocs

Cong-Cong Le （勒聪聪）

Cong Cong Le

 

 

 

 

Position 

Postdoctoral Scholar (2017 - 2019)

 

 

 

Education

Sep. 2012-Jul. 2017       Institute of Physics, CAS PhD Candidate for Condensed Matter Physics

Sep. 2008-Jul. 2012       Jiangxi Normal University, Nanchang, Jiangxi, China    B. Sc. in Physics

 

 

Research Activities

  • Study of the electronic structure of iron-based superconductors through first-principles calculation software, like the Vienna Ab initio simulation package (VASP) and WIEN2k.
  • Study of topological insulators (TIs) and semimetals by using band structure theory and group theory.

 

 

Awards

Dec. 2016    Director Scholarship honorable mention of Institute of Physics

Jun.  2016    Merit Student of University of Chinese Academy of Sciences

Dec. 2015    Director Scholarship Recognition Award of Institute of Physics

Dec. 2014    Director Scholarship Recognition Award of Institute of Physics

Sep. 2010 - Jul. 2011    professional second-class scholarship of Jiangxi Normal University

Sep. 2009 - Jul. 2010    professional first-class scholarship of Jiangxi Normal University

Sep. 2008 - Jul. 2009    professional third-class scholarship of Jiangxi Normal University

 

 

 

Publications

  1. Xianxin Wu, Congcong Le, Yi Liang, Shengshan Qin, Heng Fan, and Jiangping Hu, Effect of As-chain layers in CaFeAs2, Phys. Rev. B. 89, 205102 (2014)
  2. Dachun Gu, Xia Dai, Congcong Le, Liling Sun, QiWu, Bayrammurad Saparov, Jing Guo,Peiwen Gao, Shan Zhang, Yazhou Zhou, Chao Zhang, Shifeng Jin, Lun Xiong, Rui Li, Yanchun Li,Xiaodong Li, Jing Liu, Athena S. Sefat, Jiangping Hu and Zhongxian Zhao, Robust antiferromagnetism preventing superconductivity in pressurized (Ba0.61K0.39)Mn2Bi2, Scientific Reports. 07342(2014)
  3. Xianxin Wu, Shengshan Qin, Yi Liang, Congcong Le, Heng Fan, and Jiangping Hu, CaFeAs2: A staggered intercalation of quantum spin Hall and high-temperature superconductivity, Phys. Rev. B. 91, 081111(R) (2015)
  4. Run Yang, Congcong Le, Lei Zhang, Bing Xu, Wei Zhang, Kashif Nadeem, Hong Xiao, Jiangping Hu, and Xianggang Qiu, Formation of As-As bond and its effect on absence of superconductivity in the collapsed tetragonal phase of Ca0.86Pr0.14Fe2As2: An optical spectroscopy study, Phys. Rev. B. 91, 224507 (2015)
  5. Xianxin Wu, Fan Yang, Congcong Le, Heng Fan, and Jiangping Hu, Triplet pz-wave pairing in quasi-one-dimensional A2Cr3As3 superconductors (A = K,Rb,Cs), Phys. Rev. B. 92, 104511 (2015)
  6. Jiangping Hu, Congcong Le and Xianxin Wu, Predicting Unconventional High-Temperature Superconductors in Trigonal Bipyramidal Coordinations, Phys. Rev. X. 5. 041012(2015)
  7. WU Xian-Xin, LE Cong-Cong, YUAN Jing, FAN Heng, HU Jiang-Ping, Magnetism in Quasi-One-Dimensional A2Cr3As3 (A=K,Rb) Superconductors, CHIN. PHYS. LETT. 5 (2015) 057401
  8. Xianxin Wu, Xia Dai, Yi Liang, Congcong Le, Heng Fan, and Jiangping Hu, Density functional calculations of a staggered FeSe monolayer on a SrTiO3 (110) surface, Phys. Rev. B. 94, 045114 (2016)
  9. Xia Dai, Cong-Cong Le, Xian-Xin Wu, and Jiang-Ping Hu, Hybrid crystals of cuprates and iron-based superconductors, Chin. Phys. B. 7 (2016) 077402
  10. Xia Dai, Cong-Cong Le, Xian-Xin Wu, Sheng-Shan Qin, Zhi-Ping Lin, Jiang-Ping Hu, Topological Phase in Non-centrosymmetric Material NaSnBi, CHIN. PHYS. LETT. 12 (2016) 127301
  11. Congcong Le, Shengshan Qin, Xianxin Wu, Xia Dai, Peiyuan Fu, Jiangping Hu, Three-dimensional Critical Dirac semimetal in KMgBi, Phys. Rev. B.96, 115121 (2017)
  12. Jiangping Hu, Congcong Le, A possible new family of unconventional high temperature superconductors, Science Bulletin 62 (2017) 212-217 
  13. Zhiping Lin, Gang Wang, Congcong Le, Huaizhou Zhao, Ning Liu, Jiangping Hu, and Xiaolong Chen, Thermal conductivities in NaSnAs, NaSnP,and NaSn2As2: Effect of double lone-pair electrons, Phys. Rev. B 95, 165201(2017)
  14. Jinfeng Zeng,Shengshan Qin, Congcong Le, and Jiangping Hu, Magnetism and superconductivity in the layered hexagonal transition metal pnictides, Phys. Rev. B 96, 174506 (2017)
  15. Yinxiang Li, Xinloong Han, Shengshan Qin, Congcong Le, Qiang-Hua Wang, Jiangping Hu, Robust d-wave pairing symmetry in multi-orbital cobalt high temperature superconductors, Phys. Rev. B 96, 024506 (2017)
  16. Shengshan Qin, Congcong Le, Xianxin Wu, Jiangping Hu, Topological critical materials of ternary compounds, Journal of Physics and Chemistry of Solids 2017.12.006
  17. Congcong le, Shengshan Qin, Jiangping Hu, Electronic Physics and Possible Superconductivity in Layered Orthorhombic Cobalt Oxychalcogenides, Science Bulletin(2017), 62(8)563-571
  18. Shengshan Qin, Yinxiang Li, Qiang Zhang, Congcong Le, Jiangping Hu, Theoretical studies of superconductivity in doped BaCoSO, arXiv:1702.08304
  19. Congcong Le, Jinfeng Zeng, Guang-Han Cao, Jiangping Hu, A Possible Family of Ni-based High Temperature Superconductors, arXiv:1712.05962

 

 

Contact

Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Office: Rm. S401, Kavli ITS, UCAS (Map);

            Building A, IoP, CAS

 

 

 

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Category: Previous Postdocs

Yuichi Ohnuma (大沼 悠一）

 

 

Position

Postdoctoral Fellow (2018 - 2019)

View Dr. Y. Ohnuma's Personal CV

 

 

Education

Ph.D (2011 - 2016)

Ph.D. in Physics, Tohoku University, Japan

B. S. (2007 - 2011)

B. S. in Physics, Tohoku University, Japan

 

 

Professional Experience

Postdoctoral Fellow, Advanced Science Research Center, Japan Atomic Energy Agency, 2016.04–2018.03

Postdoctoral Fellow, Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences, 2018.04–2019.03

 

 

Research Activities

  • Spin Seebeck and spin Peltier effects
  • Spin pumping and modulation of FMR linewidth
  • Spin current noise
  • Spin Hall effect
  • Spin transport with spin vorticity coupling

 

 

Publications

M. Mamoru, Y. Ohnuma, T. Kato, and S. Maekawa

“Spin Current Noise of the Spin Seebeck Effect and Spin Pumping”

Physical Review Letters 120, 037201 (2018).

 

Y. Ohnuma, M. Mamoru, and S. Maekawa

“Theory of the spin Peltier effect”

Physical Review B 96, 134412 (2017).

 

M. Mamoru, Y. Ohnuma, and S. Maekawa

“Theory of spin hydrodynamic generation”

Physical Review B 96, 020401(R) (2017).

 

Y. Ohnuma, M. Mamoru, and S. Maekawa

“Spin transport in half-metallic ferromagnets”

Physical Review B 94, 184405 (2016).

 

S. Geprägs, A. Kehlberger, F. D. Coletta, Z. Qiu, E.-J. Guo, T. Schulz, C. Mix, S. Meyer, A. Kamra, M. Althammer, H. Huebl, G. Jakob, Y. Ohnuma, H. Adachi, J. Barker, S. Maekawa, G. E. W. Bauer, E. Saitoh, R. Gross, S. T. B. Goennenwein, and M. Kläui

“Origin of the spin Seebeck effect in compensated ferrimagnets”

Nature Communications 7, 10452 (2016).

 

Y. Ohnuma, H. Adachi, E. Saitoh, and S. Maekawa

“Magnon instability driven by heat current in magnetic bilayers”

Physical Review B 92, 224404 (2015).

 

Y. Ohnuma, H. Adachi, E. Saitoh, and S. Maekawa

“Enhanced dc spin pumping into a fluctuating ferromagnet near Tc”

Physical Review B 89, 174417 (2014).

 

Y. Ohnuma, H. Adachi, E. Saitoh, and S. Maekawa

“Spin Seebeck effect in antiferromagnets and compensated ferrimagnets”

Physical Review B 87, 014423 (2013).

 

 

Contact

Email: This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Office: Rm. 407, Building A, Institute of Physics, CAS, Haidian Dist., Beijing

 

 

 

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Category: Previous Postdocs

Yu Li (李宇)

YuLi

 

 

 

 

Position

        2019 - 2023 Postdoctoral Fellow

 

 

Education

        2008-2012, B.S.. Donghua University, Shanghai, China

        2012-2018, Ph. D., Institute of Physics, Chinese Academy of Sciences, Beijing, China

 

 

Professional Experience

05/2019-08/2019: Research Assistant, South University of Science and Technology, Shenzhen, China

09/2019-NOW: Postdoctoral Fellow, Kavli ITS, UCAS, Beijing, China

 

 

Research Interest

        Pairing symmetry and pairing mechanism in unconventional superconductivity

        Novel phenomena in strongly correlated systems (such as heavy fermions)

        Topological superconductivity

 

 

 

Publications

[1] Yu Li, Zhiqiang Wang, and Wen Huang, Anomalous Hall effect in chiral superconductors from impurity superlattices, arXiv:1909.08012 (2019).

[2] Yu Li, and Wen Huang, Possible ‘symmetry-imposed’ near-nodal two-dimensional p-wave pairing in Sr2RuO4, arXiv:1909.03141 (2019).

[3] Yu Li, Qianqian Wang, Yuanji Xu, Wenhui Xie, and Yi-feng Yang, Nearly-degenerate px+ipy and dx2-y2 pairing symmetry in the heavy fermion superconductor YbRh2Si2, Phys. Rev. B 100, 085132 (2019).

[4] Zhe Liu, Yu Li, and Yi-feng Yang, Possible nodeless s±-wave superconductivity in twisted bilayer graphene, Chin. Phys. B 28, 077103 (2019).

[5] Yu Li, Min Liu, Zhaoming Fu, Xiangrong Chen, Fan Yang, and Yi-feng Yang, Gap symmetry of heavy fermion superconductor CeCu2Si2 at ambient pressure, Phys. Rev. Lett. 120, 217001 (2018).

[6] Yu Li and Yi-feng Yang, A phenomenological theory of heavy fermion superconductivity in CeCoIn5, Chin. Sci. Bull. 62, 4068 (2017).

[7] Yi-feng Yang and Yu Li, Heavy-fermion superconductivity and competing orders, Acta Physica Sinica 64, 217401 (2015).

[8] Yi-feng Yang, Neng Xie, and Yu Li, Two-fluid theory for heavy fermion materials, Progress in Physics 35, 191 (2015).

  1. Jian-Jian Miao
  2. Sheng-Shan Qin
  3. Wen-Xin Ding