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Yang Liu Personal Page

Education

2000-2004, University of Science and Technology of China, Bachelor in Physics
2004-2010, University of Illinois Urbana-Champaign, Ph. D in Physics (Advisor: Prof. Tai-chang Chiang)

Employment

2010 Nov – 2012 June, Postdoc researcher, University of Illinois Urbana-Champaign (Prof. Tai-chang Chiang group)
2012 July – 2014 Sep, Postdoc researcher, surface scattering and microdiffraction group, X-ray science division, Argonne National Lab, USA
2014 Oct -2015 Oct, Postdoc researcher, Cornell University (jointly with Prof. Darrell Schlom and Prof. Kyle Shen)
2015 Oct – Present, Tenure-track professor, Zhejiang University (浙大百人计划研究员)

Honors & Awards

Young one thousand talent award 2014 (中组部青年千人计划)
Aladdin lamp award, Synchrotron Radiation Center, 2008 (USA)
Guo Moruo Scholarship (郭沫若奖), University of Science and Technology of China, 2004

Research Interests

Our research interest lies at novel thin films and interfaces that are of fundamental scientific interest and technological relevance. The central questions that we would like to address includes the following: How does the dimensionality, i.e., quantum confinement, affect the electronic correlations/properties in ultrathin films? How does the broken symmetry at the interface generate exotic quantum phases? How do we understand the strong correlations between structure and electronic properties in these films? Specifically, we are interested in a class of materials which exhibit strong coupling between lattice, spin, charge and orbitals, including complex oxides, heavy fermions, etc. By tuning the film thickness (dimensionality) and interfacial property (interaction), new/superior quantum properties could be achieved for device applications. 
Experimentally, we are combing advanced thin film growth techniques and in-situ electron spectroscopy to understand the electronic structures of thin films. For film growth, we utilize molecular beam epitaxy (MBE) to prepare atomically uniform films with sharp interfaces. To measure the electronic structure, we make use of angle-resolved photoemission spectroscopy (ARPES) to directly probe the electronic states in the films.We are currently designing and building a MBE + ARPES system at Zijingang campus (东四教学楼).

Meanwhile, we are also making extensive use of national and international synchrotron facilities to perform synchrotron X-ray scattering and spectroscopy experiments on these materials. Recent developments in surface X-ray scattering and resonant X-ray scattering has made it possible to solve the atomic/interfacial structure in thin films with high precision. Resonant scattering and X-ray absorption spectroscopy are also complementary tools to study the electronic property and ordering. Using these tools, we hope to understand the structure-property correlations in these thin films. 

Our research group is part of the center for correlation matter (CCM) at Zhejiang University. CCM is an international center that fosters innovative and collaborative efforts towards significant scientific problems in the field of correlated materials. We work closely with other groups in the center. 

Selected Publications (* indicates corresponding author)

Peng Li, Zhongzheng Wu, Fan Wu, Chao Cao*, Chunyu Guo, Yi Wu, Yi Liu, Zhe Sun, Cheng-Maw Cheng, Deng-Sung Lin, Frank Steglich, Huiqiu Yuan*, Tai-Chang Chiang and Yang Liu*, “Tunable Topological Surface States in Rare Earth Mono-Bismuthides with Partially Filled f Shell”, arXiv:1802.03111 (submitted to physical review B) 
  
Z. Z. Wu, P. Li, F. Wu, C. Guo, Y. Wu, Y. Liu, Z. Sun, C. Cao, H. Yuan*, and Y. Liu*, “Band Topology and Origin of Extreme Magnetoresistance in Pr/Sm Mono-Antimonide/Bismuthide: A Photoemission Study”, to be submitted to JPCM 

Yang Liu, Hari P. Nair, Jacob P. Ruf, Darrell G. Schlom, and Kyle M. Shen, “Revealing the Hidden Heavy Fermi Liquid in CaRuO3”, submitted to Physical Review Letters 

X. Duan, F. Wu, J. Chen, P. Zhang, H. Yuan, Y. Liu, and C. Cao, “Tunable Electronic Structure and Topological Properties of LnPn (Ln=Ce, Pr, Gd, Sm, Yb; Pn=Sb, Bi)”, submitted. 

H. P. Nair, Y. Liu, J. P. Ruf, N. J. Schreiber, S.-L. Shang, D. J. Baek, B. H. Goodge, L. F. Kourkoutis, Z.-K. Liu, K. M. Shen, and D. G. Schlom, “Synthesis Science of SrRuO3 and CaRuO3 Epitaxial Films with High Residual Resistivity Ratios”, APL Materials  6, 046101 (2018). 
  
H. Cao, Y. Liu, G. Liang, A. Zhao and X. Zhai “Unravelling interfacial strain and interfacial lattice reconstruction mechanism of ultrathin LaMnO3+δ layers in LaMnO3+δ /SrTiO3 superlattices”, J. Appl. Phys. 122, 085309 (2017). 
  
Z. Ye, S. Cui, T. Shu, S. Ma, Y. Liu, Z. Sun, J.-W. Luo, and H. Wu, “Electronic band structure of epitaxial PbTe(111) thin films observed by angle-resolved photoemission spectroscopy”, Phys. Rev. B 95, 165203 (2017). 

C.-Z. Xu, Y. Liu, R. Yukawa, L.-X. Zhang, I. Matsuda, T. Miller and T.-C. Chiang, Photoemission circular dichroism and spin polarization of the topological surface states in ultrathin Bi2Te3 films, Phys. Rev. Lett. 115, 016801 (2015) (Editors’ suggestion).

X. Zhai*, L. Cheng, Y. Liu*, C. M. Schlepütz, S. Dong*, H. Li, X. Zhang, S. Chu, L. Zheng, J. Zhang, A. Zhao, H. Hong, A. Bhattacharya, J. N. Eckstein, C. Zeng, “Correlating interfacial octahedral rotations with magnetism in (LaMnO3+δ)N/(SrTiO3)N superlattices”, Nat. Commun. 5:4283, doi: 10.1038/ncomms5283 (2014).

Y. Liu*, H.-H. Wang, Z. Zhan, S. S. Lee, P. A. Fenter, J. Z. Tischler, H. Hong and T.-C. Chiang*, “Interfacial bonding and structure of Bi2Te3 topological insulator films on Si(111) determined by surface X-ray scattering”, Phys. Rev. Lett. 110, 226103 (2013), selected as research highlight in 2013 annual report of Advanced Photon Source.

Y. Liu, G. Bian, T. Miller, M. Bissen and T.-C. Chiang, “Topological limit of ultrathin quasi-freestanding Bi2Te3 films grown on Si(111)”,Phys. Rev. B 85, 195442 (2012).

G. Bian, L. Zhang, Y. Liu, T. Miller, and T.-C. Chiang, “Illuminating the surface spin texture of the giant-Rashba quantum-well system Bi/Ag(111) by circularly-polarized photoemission”, Phys. Rev. Lett. 108, 186403 (2012). 

G. Bian, X. Wang, Y. Liu, T. Miller, and T.-C. Chiang, “Interfacial protection of topological surface states in ultrathin Sb films”, Phys. Rev. Lett. 108, 176401 (2012).

Y. Liu, G.Bian, T. Miller and T.-C. Chiang, “Visualizing electronic chirality and Berry’s phases in graphene systems by photoemission using circularly polarized light”, Phys. Rev. Lett. 107, 166803 (2011), chosen as Editor’s suggestion and highlighted in a viewpoint article in Physics 4, 79 (2011), “Unraveling electron chirality in graphene”.

Y. Liu, L. Zhang, M. K. Brinkley, G.Bian, T. Miller and T.-C. Chiang*, “Phonon-induced gaps in graphite/graphene by angle-resolved photoemission”, Phys. Rev. Lett. 105, 136804 (2010).

Contact

Feel free to contact me at yangliuphys@zju.edu.cn or visit my personal website at

http://person.zju.edu.cn/yangliuphys