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研究内容：我们研究组利用和开发先进的低温扫描隧道显微镜技术研究低维量子材料和原子尺度量子磁体的新奇物理性质。目前主要的研究方向包括：

（1）低维体系中量子物态的探测与界面调控；（2）原子尺度自旋动力学；（3）研发新型扫描隧道显微技术。

过去的主要工作及获得的成果：

（1）过渡金属硫族化合物中量子物态的探测与界面调控：在1T-TaS₂材料中发现了界面水驱动的电荷密度波相变动力学过程(Nano Lett 2020, 20, 8854)以及通过插层Pb原子实现了近藤晶格的调控(Nature Commun 2022, 13, 2156)；层状超导材料4Hb-TaS₂中电子窄带和准二维超导电性的探测(PRL 2021, 126, 256402)； Cu插层的1T-TiSe₂超导材料中电荷密度波畴壁的表征(PRL 2017, 118, 106405)。

（2）高导电性过渡金属氧化物(PdCoO_2、PdCrO₂)中量子物态的探测：在该类材料的极性解理面上发现了二维的非公度电荷密度波调制(Nano Lett 2022, 22, 5635) 和隐藏的莫特能隙(PRL 2023, 131, 116501)。

（3）首次在实空间观测到了镍砷基超导材料中的单轴电荷密度波和复杂结构调制，并揭示了它们与超导电性之间的关联(Nano Lett 2023, 23, 2958)。

（4）原子尺度量子磁体自旋激发态的探测与调控：首次在实验上实现了自旋极化针尖对量子磁体自旋动力学的调控(Nature Nanotech 2015, 10, 40)；利用原子尺度量子传感结构实现了对反铁磁体自旋态的探测(Science Adv 2017, 3, e1603137)；发现了量子磁体中自旋激发诱导的负微分电阻效应(PRL 2017, 119, 217201)；测量出了单个磁性原子的自旋激发谱对三维矢量磁场的响应(Nano Lett 2015, 15, 1938)。

欢迎有志于在低维量子材料、界面物理、量子磁体等领域开展前沿研究的学生加入！我们特别欢迎具有电子学、程序设计经验的学生报考！

我们长期欢迎对低温扫描隧道显微技术和分子束外延材料生长有兴趣的博士后和助理研究员加入！有意者请与课题组长联系！

* Corresponding authors;

# Equally contributed authors.

31. C. Wen^#, T. Qin^#, X. Zhang^#, M. Zhang^#, W. Hu, S. Shen, Z. Yang, Y. Qi^*, G. Li^*, S. Yan^*, “Probing Hidden Mott Gap and Incommensurate Charge Modulation on the Polar Surfaces of PdCrO₂”

Physical Review Letters 131, 116501 (2023) 

30. T. Qin^#, R. Zhong^#, W. Cao^#, S. Shen, C. Wen^*, Y. Qi^*, S. Yan^*, “Real-Space Observation of Unidirectional Charge Density Wave and Complex Structural Modulation in the Pnictide Superconductor Ba_1-xSr_xNi₂As₂”

Nano Letters 23, 2958-2963 (2023)

29. S. Shen, C. Wen, P. Kong, J. Gao, J. Si, X. Luo, W. Lu, Y. P. Sun, G. Chen, S. Yan^*, “Inducing and Tuning Kondo Screening in a Narrow-Electronic-Band System”

Nature Communications 13, 2156 (2022)

28. P. Kong^#, G. Li^#, Z. Yang^#, C. Wen^*, Y. Qi, C. Felser, S. Yan^*, “Fully Two-Dimensional Incommensurate Charge Modulation on the Pd-Terminated Polar Surface of PdCoO₂”

Nano Letters 22, 5635-5640 (2022)

27. S. Shen, T. Qin, J. Gao, C. Wen, J. Wang, W. Wang, J. Li,  X. Luo, W. Lu, Y. Sun^*, S. Yan^*, “Coexistence of Quasi-two-dimensional Superconductivity and Tunable Kondo Lattice in a van der Waals Superconductor”

Chinese Physics Letters 39, 077401 (2022) (Express Letter) 

26. H. Yang^#­, K. He^#, J. Koo^#, S. Shen, S. Zhang, G. Liu, Y. Liu, C. Chen, A. Liang, K. Huang, M. Wang, J. Gao, X. Luo, L. Yang, J. Liu, Y. Sun, S. Yan, B. Yan^*, Y. Chen^*, X. Xi^*, Z. Liu^*,  “Visualization of chiral electronic structure and anomalous optical response in a material with chiral charge density waves”

Physical Review Letters 129, 156401 (2022) 

25. C. Wen, J. Gao, Y. Xie, Q. Zhang, P. Kong, J. Wang, Y. Jiang, X. Luo, J. Li, W. Lu, Y. Sun^*, S. Yan^*, “Roles of the Narrow Electronic Band near the Fermi Level in 1T-TaS₂-Related Layered Materials”

Physical Review Letters 126, 256402 (2021)

24. Q. Wang^#, P. Kong^#, W. Shi, C. Pei, C. Wen, L. Gao, Y. Zhao, Q. Yin, Y. Wu, G. Li, H. Lei, J. Li, Y. Chen, S. Yan^*, Y. Qi^*, “Charge Density Wave Orders and Enhanced Superconductivity under Pressure in the Kagome Metal CsV₃Sb₅”

Advanced Materials 33, 2102813 (2021)

23.  L. Gao, S. Shen, Q. Wang, W. Shi, Y. Zhao, C. Li, W. Cao, C. Pei, J. Ge, G. Li, J. Li, Y. Chen, S. Yan, Y. Qi^*, “Anomalous Hall Effect in Ferrimagnetic Metal RMn₆Sn₆ (R = Tb, Dy, Ho) with Clean Mn Kagome Lattice”

Applied Physics Letters 119, 092405 (2021)

22. Z. Liu^*, M. Li, Q. Wang, G. Wang, C. Wen, K. Jiang, X. Lu, S. Yan, Y. Huang, D. Shen, J. X. Yin, Z. Wang, Z. Yin^*, H. Lei^*, S. Wang^*, “Orbital-selective Dirac Fermions and Extremely Flat Bands in Frustrated Kagome-lattice Metal CoSn”

Nature Communications 11, 4002 (2020)

21. S. Shen, B. Shao^*, C. Wen, X. Yuan, J. Gao, Z. Nie, X. Luo, B. Huang, Y. Sun, S. Meng, S. Yan^*, “Single-water-dipole-layer-driven Reversible Charge Order Transition in 1T-TaS₂”

Nano Letters 20, 8854-8860 (2020) 

20. S. Shen^#, X. Yuan^#, C. Wen, J. Gao, X. Luo, X. Lu, Y. P. Sun, S. Yan^*, “Melting of Charge Density Wave and Mott Gap Collapse on 1T-TaS₂ Induced by Interfacial Water”

Physical Review Materials 4, 064007 (2020)

19. C. Wen^#, Y. Xie^#, Y. Wu, S. Shen, P. Kong, H. Lian, J. Li, H. Xing, S. Yan^*, “Impurity-pinned Incommensurate Charge Density Wave and Local Phonon Excitations in 2H-NbS₂”

Physical Review B 101, 241404(R) (2020)

18. L. Malavolti, G. McMurtrie, S. Rolf-Pissarczyk, S. Yan, J. Burgess, S. Loth^*, “Minimally Invasive Spin Sensing with Scanning Tunneling Microscopy”

Nanoscale 12, 11619 (2020)

17. D. Iaia, G. Chang, T. R. Chang, J. Hu, Z. Mao, H. Lin, S. Yan^*, V. Madhavan^*, “Searching for Topological Fermi Arcs via Quasiparticle Interference on a Type-II Weyl Semimetal MoTe₂”

npj Quantum Materials 3, 38 (2018)

16. L. Sun, A. Dong, J. Li, D. Hao, X. Tang, S. Yan, Y. Guo, X. Shan, X. Lu^*, “Optical Stark Effect of a Single Defect on TiO₂(110) Surface”

Physical Review B 98, 081402 (2018)

15. A. Dong, L. Yan, L. Sun, S. Yan, X. Shan, Y. Guo, S. Meng, X. Lu^*, “Identifying Few-Molecule Water Clusters with High Precision on Au(111) Surface”

ACS Nano 12, 6452 (2018)

14. S. Rolf-Pissarczyk^#,*, S. Yan^#,*, L. Malavolti, J. Burgess, G. McMurtrie, S. Loth^*, “Dynamical Negative Differential Resistance in Antiferromagnetically Coupled Few-atom Spin Chains”

Physical Review Letters 119, 217201 (2017)

Prior to ShanghaiTech:

13. D. Choi, R. Robles, S. Yan, J. Burgess, S. Rolf-Pissarczyk, J. Gauyacq, N. Lorente, M. Ternes, S. Loth^*, “Building Complex Kondo Impurities by Manipulating Entangled Spin Chains”

Nano Letters 17, 6203-6209 (2017)

12. S. Yan^*, L. Malavolti, J. A. J. Burgess, A. Droghetti, A. Rubio, S. Loth^*, “Non-locally Sensing the Magnetic States of Nanoscale Antiferromagnets with an Atomic-scale Spin Sensor”

Science Advances 3,e1603137 (2017)

11. S. Yan, D. Iaia, E. Morosan, E. Fradkin, P. Abbamonte, V. Madhavan^*, “Influence of Domain Walls in the Incommensurate Charge Density Wave State of Cu Intercalated 1T-TiSe₂”

Physical Review Letters 118, 106405 (2017)

10. S. Rolf-Pissarczyk^*, J. Burgess, S. Yan, S. Loth^*, “Closing the Superconducting Gap in Small Pb Nanoislands with High Magnetic Fields”

Physical Review B 94, 224504 (2016)

9.  J. Burgess^*, L. Malavolti, V. Lanzilotto, M. Mannini, S. Yan, S. Ninova, F. Totti, S. Rolf-Pissarczyk, A. Cornia, R.  Sessoli, S. Loth^*, “Magnetic Fingerprint of Individual Fe4 Molecular Magnets under Compression by a Scanning Tunneling Microscope”

Nature Communications 6, 8216 (2015)

8.  S. Yan^*, D. Choi, J. Burgess, S. Rolf-Pissacrczyk, S. Loth^*, “Control of Quantum Magnets by Atomic Exchange Bias”

Nature Nanotechnology 10, 40-45 (2015)

7.  S. Yan^*, D. Choi, J. Burgess, S. Rolf-Pissacrczyk, S. Loth^*, “Three-Dimensional Mapping of Single-Atom Magnetic Anisotropy”

Nano Letters 15, 1938-1942 (2015)

6.   S. Loth^*, J. Burgess, S. Yan, “Scanning Probe Microscopy: Close Up on Spin Coherence”

Nature Nanotechnology 9, 574 (2014) (news and views)

5.  N. Xie, H. Gong, Z. Zhou, X. Guo, S. Yan, Q. Sun, S. Xing, W. Wu, S. Pei, J. Bao, X. Shan, Y. Guo, X. Lu^*, “Visualization of a Maze-Like Reconstruction of Graphene on Copper Surface at the Atomic Scale”

Chinese Physics Letters 5, 056802 (2013)

4.  N. Xie, H. Gong, S. Yan, J. Zhao, X. Shan, Q. Sun, Y. Guo, X. Lu^*, “Tip Expansion in a Laser Assisted Scanning Tunneling Microscope”

Applied Physics Letters 101, 213104 (2012)

3.  S. Yan, Z. Ding, N. Xie, H. Gong, Q. Sun, Y. Guo, X. Shan, S. Meng, X. Lu^*, “Turning on and off the Rotational Oscillation of a Single Porphine Molecule by Molecular Charge State”

ACS Nano 6, 4132-4136 (2012)

2.  S. Yan, N. Xie, H. Gong, Q. Sun, Y. Guo, X. Shan, X. Lu^*, “Mapping the Diffusion Potential of a Reconstructed Au(111) Surface at Nanometer Scale with 2D Molecular Gas”

Chinese Physics Letters 4, 046803 (2012)

1.  R. Wu, Y. Zhang, S. Yan, B. Fei, W. Wang^*, X. Bai, X. Lu, J. Zhao^*, E. Wang, “Purely Coherent Nonlinear Optical Response in Solution Dispersions of Graphene Sheets”

Nano Letters 11, 5159-5164 (2011)