Kai Chang Lab

Low-Dimensional Quantum Materials - BAQIS

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Dr. Kai Chang
(常凯)

Research Scientist (PI)

E-mail: changkai-at-baqis-dot-ac-dot-cn

ORCID: 0000-0002-4965-4537

Experiences

  • 2005 – 2009 B.Sc., School of Physics and Microelectronics, Shandong University (山东大学)
  • 2009 – 2015 Ph.D., Department of Physics, Tsinghua University (清华大学) (Supervisor: Prof. Qi-Kun Xue)
  • 2015 – 2019 Postdoctoral associate in Max-Planck Institute of Microstructure Physics (Department Head: Prof. Stuart S. P. Parkin)
  • 2020 – 2023 Principal Investigator of LDQM Group, BAQIS
  • 2023 – 2024 Assistant President & PI, BAQIS
  • 2024 – Present  Executive President & PI, BAQIS

Research Interests

      Molecular beam epitaxial (MBE) growth and in situ low/variable-temperature scanning tunneling microscopy (STM) studies of

  • Phase transition and tuning effects in low-dimensional ferroic material nanostructures and heterostructures;
  • Exotic electronic states in low-dimensional semiconductor heterostructures;
  • Rationally designed heterostructures and superlattices between topological insulators, semimetals, superconductors.

Publication

Journal Articles
#Corresponding author, *Co-first author

  1. Jiesu Wang#, Shuai Xu, Sebastian Meyer, Shiyao Wu, Subhadeep Bandyopadhyay, Xu He, Qiyuan Miao, Sisi Huang, Pengzhan Li, Kun Zhao, Er‐Jia Guo, Chen Ge, Bertrand Dupé, Philippe Ghosez, Kai Chang#, Kuijuan Jin#. Manipulation of Ferroic Orders via Continuous Biaxial Strain Engineering in Multiferroic Bismuth Ferrite. Advanced Science, 2417165, 2025. https://advanced.onlinelibrary.wiley.com/doi/10.1002/advs.202417165
  2. W. He, C. Chen, S. Wu, W. P. D. Wong, Z. Wu, K. Chang, J. Wang#, H. Gao#, K. P. Loh, Dion–Jacobson Perovskites with a Ferroelectrically Switchable Chiral Nonlinear Optical Response. J. Am. Chem. Soc. 147, 811–820 (2025). https://pubs.acs.org/doi/10.1021/jacs.4c13604
  3.  J.-R. Ji, H. W. Villanova, S. Barraza-Lopez#, S. S. P. Parkin#, K. Chang#, Defect-Free Nanowelding of Bilayer SnSe Nanoplates. Adv. Mater. 36, 3212199 (2024). https://doi.org/10.1002/adma.202312199
  4.  C. Yue, Z. Huang, W.-L. Wang, Z.’A. Gao, H. Lin#, J. Liu#, K. Chang#, Identification and Manipulation of Atomic Defects in Monolayer SnSe. ACS Nano 18, 25478-25488 (2024). https://doi.org/10.1021/acsnano.4c04789
  5. K. Zhu*, Y. Cheng*, M. Liao*, S. K. Chong, D. Zhang, K. He, K. L. Wang, K. Chang, P. Deng#, Unveiling the Anomalous Hall Response of the Magnetic Structure Changes in the Epitaxial MnBi2Te4 Films. Nano Lett. 24, 2181–2187 (2024). https://doi.org/10.1021/acs.nanolett.3c04095
  6. K. Chang, M. Hu, H. Lin, J. Liu#, Q.-K. Xue, X. Chen#, S.-H. Ji#, Oscillation of Electronic-Band-Gap Size Induced by Crystalline Symmetry Change in Ultrathin PbTe Films. Phys. Rev. Lett. 131, 016202 (2023). https://doi.org/10.1103/PhysRevLett.131.016202
  7. S. Xu*, J. Wang*, P. Chen*, K. Jin#, C. Ma, S. Wu, E. Guo, C. Ge, C. Wang, X. Xu, H. Yao, J. Wang, D. Xie, X. Wang, K. Chang, X. Bai, G. Yang, Magnetoelectric coupling in multiferroics probed by optical second harmonic generation. Nature Commun. 14, 2274 (2023). https://doi.org/10.1038/s41467-023-38055-x
  8. D.-M. Huang#, X. Wu, K. Chang, H. Hu, Y.-L. Wa, H. Q. Xu#, J.-J. Zhang#, Strain Effects in Twisted Spiral Antimonene. Adv. Sci. 2301326 (2023). (Online version) https://doi.org/10.1002/advs.202301326
  9. C. Liu#, K. Chang, K. Zou, Realistic simulation of reflection high-energy electron diffraction patterns for two-dimensional lattices using Ewald construction. J. Vac. Sci. Technol. B 40, 054002 (2022). https://doi.org/10.1116/6.0001899
  10.  K. Zhu, H. Wang, Y. Zhu, Y. Zang, Y. Feng, B. Tong, D. Zhao, X. Xie, K. Chang, K. He#, C. Liu#, Stoichiometric Growth of Monolayer FeSe Superconducting Films Using a Selenium Cracking Source. Crystals 12, 853 (2022). https://doi.org/10.3390/cryst12060853
  11. A. Bedoya-Pinto#, D. Liu, H. Tan, A. K. Pandeya, K. Chang, J. Zhang, S. S. P. Parkin#, Large Fermi-Energy Shift and Suppression of Trivial Surface States in NbP Weyl Semimetal Thin Films. Adv. Mater. 33, 2008634 (2021). https://doi.org/10.1002/adma.202008634
  12. K. Chang#, J. W. D. Villanova, J.-R. Ji, S. Das, F. Küster, S. Barraza-Lopez#, P. Sessi#, S. S. P. Parkin#, Vortex-Oriented Ferroelectric Domains in SnTe/PbTe Monolayer Lateral Heterostructures. Adv. Mater. 33, 2102267 (2021). https://doi.org/10.1002/adma.202102267
  13.  S. Barraza-Lopez#, B. M. Fregoso, J. W. Villanova, S. S. P. Parkin, K. Chang#, Colloquium: Physical properties of group-IV monochalcogenide monolayers. Rev. Mod. Phys. 93, 011001 (2021). https://doi.org/10.1103/RevModPhys.93.011001
  14. G. Li#, J. Huang, Q. Yang, L. Zhang, Q. Mu, Y. Sun, S. Parkin, K. Chang#, C. Felser#, MoS2 on topological insulator Bi2Te3 thin films: Activation of the basal plane for hydrogen reduction. J. Energy Chem. 62, 516-522 (2021). https://doi.org/10.1016/j.jechem.2021.04.010
  15. A. Bedoya-Pinto*#, J.-R. Ji*, A. Pandeya, P. Gargiani, M. Valvidares, P. Sessi, F. Radu, K. Chang#, and S. S. P. Parkin#. Intrinsic 2D-XY ferromagnetism in a van der Waals monolayer. Science 374, 616-620 (2021). https://doi.org/10.1126/science.abd5146
  16. P. Sessi#, F.-R. Fan, F. Küster, K. Manna, N. B.M. Schröter, J.-R. Ji, S. Stolz, J. A. Krieger, D. Pei, T. K. Kim, P. Dudin, C. Cacho, R. Widmer, H. Borrmann, W. Shi, K. Chang, Y. Sun, C. Felser, and S. S.P. Parkin#. Handedness-dependent quasiparticle interference in the two enantiomers of the topological chiral semimetal PdGa. Nature Commun. 11, 3507 (2020). https://doi.org/10.1038/s41467-020-17261-x
  17. K. Chang#, F. Küster, B. J. Miller, J.-R. Ji, J.-L. Zhang, P. Sessi, S. Barraza-Lopez, and S. S. P. Parkin#. Microscopic manipulation of ferroelectric domain walls in SnSe monolayers at room temperature. Nano Lett. 20, 6590-6597 (2020). https://doi.org/10.1021/acs.nanolett.0c02357
  18. K. Chang# and S. S. P. Parkin#. Experimental formation of monolayer group-IV monochalcogenides. J. Appl. Phys. 127, 220902 (2020). (Invited Review) https://doi.org/10.1063/5.0012300
  19.  S.-Y. Yang, K. Chang#, and S. S. P. Parkin*. Large planar Hall effect in bismuth thin films. Phys. Rev. Research 2, 022029(R) (2020). https://doi.org/10.1103/PhysRevResearch.2.022029
  20.  A. Bedoya-Pinto#, A. K. Pandeya, D. Liu, H. Deniz, K. Chang, H. Tan, H. Han, J. Jena, I. Kostanovskiy, and Stuart S. P. Parkin#. Realization of Epitaxial NbP and TaP Weyl Semimetal Thin Films. ACS Nano 14, 4405-4413 (2020). https://doi.org/10.1021/acsnano.9b09997
  21. K. Chang, B. J. Miller, H. Yang, H. Lin, S. S. P. Parkin#, S. Barraza-Lopez, Q.-K. Xue, X. Chen#, and S.-H. Ji#. Standing waves induced by valley-mismatched domains in ferroelectric SnTe monolayers. Phys. Rev. Lett. 122, 206402 (2019). https://doi.org/10.1103/PhysRevLett.122.206402
  22.  T. P. Kaloni, K. Chang, B. J. Miller, Q.-K. Xue, X. Chen, S.-H. Ji, S. S. P. Parkin, and S. Barraza-Lopez#. From an atomic layer to the bulk: Low-temperature atomistic structure and ferroelectric and electronic properties of SnTe films. Phys. Rev. B 99, 134108 (2019). https://doi.org/10.1103/PhysRevB.99.134108
  23.  K. Chang and S. S. P. Parkin#. The growth and phase distribution of ultrathin SnTe on graphene. APL Materials 7, 041102 (2019). https://doi.org/10.1063/1.5091546
  24.  H. Shen#, J. Liu, K. Chang, and L. Fu, In-Plane Ferroelectric Tunneling Junction. Phys. Rev. Applied 11, 024048 (2019). https://doi.org/10.1103/PhysRevApplied.11.024048
  25. K. Chang, T. P. Kaloni, H. Lin, A. Bedoya-Pinto, A. K. Pandeya, I. Kostanovskiy, K. Zhao, Y. Zhong, X. Hu, Q.-K. Xue, X. Chen, S.-H. Ji, S. Barraza-Lopez, and S. S. P. Parkin#. Enhanced Spontaneous Polarization in Ultrathin SnTe Films with Layered Antipolar Structure. Adv. Mater. 31, 1804428 (2019). https://doi.org/10.1002/adma.201804428
  26. K. Chang*, J. Liu*, H. Lin, N. Wang, K. Zhao, A. Zhang, F. Jin, Y. Zhong, X. Hu, W. Duan, Q. Zhang, L. Fu, Q.-K. Xue, X. Chen#, and S.-H. Ji#. Discovery of robust in-plane ferroelectricity in the atomic-thick SnTe. Science 353, 274 (2016). https://doi.org/10.1126/science.aad8609
    See also the perspective: B. J. Kooi and B. Noheda, Ferroelectric chalcogenides — materials at the edge. Science 353, 221 (2016). https://doi.org/10.1126/science.aaf9081
  27. K. Chang, P. Deng, T. Zhang, H.-C. Lin, K. Zhao, S.-H. Ji#, L.-L. Wang, K. He, X.-C. Ma, X. Chen#, and Q.-K. Xue#. Molecular beam epitaxy growth of superconducting LiFeAs film on SrTiO3(001) substrate. EPL 109, 28003 (2015). https://doi.org/10.1209/0295-5075/109/28003
  28. J. Wen#, H. Guo, C.-H. Yan, Z.-Y. Wang, K. Chang, P. Deng, T. Zhang, Z.-D. Zhang, S.-H. Ji, L.-L. Wang, K. He, X.-C. Ma, X. Chen, and Q.-K. Xue#. Synthesis of semimetal A3Bi (A = Na, K) thin films by molecular beam epitaxy. Appl. Surf. Sci. 327, 213 (2015). https://doi.org/10.1016/j.apsusc.2014.11.083
  29. J. Wen, H. Guo, C.-H. Yan, Z.-Y. Wang, K. Chang, P. Deng, T. Zhang, Z.-D. Zhang, S.-H. Ji, L.-L. Wang, K. H., X.-C. Ma, X. Chen, and Q.-K. Xue#. Semimetal Na3Bi thin film grown on double-layer graphene by molecular beam epitaxy. Chin. Phys. Lett. 31, 116802 (2014). https://doi.org/10.1088/0256-307X/31/11/116802
  30. Z. Li#, J.-P. Peng, H.-M. Zhang, W.-H. Zhang, H. Ding, P. Deng, K. Chang, C.-L. Song, S.-H. Ji, L. Wang, K. He, X. Chen, Q.-K. Xue, and X.-C. Ma. Molecular beam epitaxy growth and post-growth annealing of FeSe films on SrTiO3: a scanning tunneling microscopy study. J. Phys: Cond. Mat. 26, 265002 (2014). https://doi.org/10.1088/0953-8984/26/26/265002
  31. W. Li, H. Ding, P. Zhang, P. Deng, K. Chang, K. He, S. Ji, L. Wang, X. Ma, J. Wu, J.-P. Hu, and Q.-K. Xue#, and X. Chen#. Superconductivity in a single-layer alkali-doped FeSe: A weakly coupled two-leg ladder system. Phys. Rev. B 88, 140506 (2013). https://doi.org/10.1103/PhysRevB.88.140506
  32.  Q.-Y. Wang, Z. Li, W.-H. Zhang, Z.-C. Zhang, J.-S. Zhang, W. Li, H. Ding, Y.-B. Ou, P. Deng, K. Chang, J. Wen, C.-L. Song, K. He, J.-F. Jia, S.-H. Ji, Y.-Y. Wang, L.-L. Wang, X. Chen, X.-C. Ma#, and Q.-K. Xue#. Interface-induced high-temperature superconductivity in single unit-cell FeSe films on SrTiO3. Chin. Phys. Lett. 29, 037402 (2012). https://doi.org/10.1088/0256-307X/29/3/037402
  33.  W. Li, H. Ding, Z. Li, P. Deng, K. Chang, K. He, S. Ji, L. Wang, X. Ma, J.-P. Hu, X. Chen#, and Q.-K. Xue#. KFe2Se2 is the parent compound of K-doped iron selenide superconductors. Phys. Rev. Lett. 109, 057003 (2012). https://doi.org/10.1103/PhysRevLett.109.057003
  34. W. Li, H. Ding, P. Deng, K. Chang, C. Song, K. He, L. Wang, X. Ma, J.-P. Hu, X. Chen#, and Q.-K. Xue#. Phase separation and magnetic order in K-doped iron selenide superconductor. Nature Phys. 8, 126-130 (2012). https://doi.org/10.1038/nphys2155

Book Chapter

  1. A. Bedoya-Pinto#, K. Chang, M. G. Samant, S. Parkin, Material Preparation/Thin Film Growth. © Springer Nature Switzerland AG 2021, M. Coey, S. Parkin (eds.), Handbook of Magnetism and Magnetic Materials. https://doi.org/10.1007/978-3-030-63101-7_23-1

Patent

  1. J. Liu, K. Chang, S.-H. Ji, X. Chen, and L. Fu. Apparatus and methods for memory using in-plane polarization. US patent, No.: US 9,959,920 B2. Date of patent: May 1, 2018.

Opening positions

We are recruiting 2 PhD students/postdoctoral fellows each year. Feel free to contact us.

     Address: Building #3, West Area, No.10 Xi-bei-wang East Road, Haidian District, Beijing 100193, P.R. CHINA.