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Dive into the research topics where Jianfeng Wang is active.

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Featured researches published by Jianfeng Wang.


Physical Review Letters | 2014

Experimental Observation of Dirac-like Surface States and Topological Phase Transition in Pb1-xSnxTe(111) Films

Chen-Hui Yan; Junwei Liu; Yunyi Zang; Jianfeng Wang; Zhenyu Wang; Peng Wang; Zhidong Zhang; Lili Wang; Xucun Ma; Shuai-Hua Ji; Ke He; Liang Fu; Wenhui Duan; Qi-Kun Xue; Xi Chen

The surface of a topological crystalline insulator (TCI) carries an even number of Dirac cones protected by crystalline symmetry. We epitaxially grew high-quality Pb(1-x)Sn(x)Te(111) films and investigated the TCI phase by in situ angle-resolved photoemission spectroscopy. Pb(1-x)Sn(x)Te(111) films undergo a topological phase transition from a trivial insulator to TCI via increasing the Sn/Pb ratio, accompanied by a crossover from n-type to p-type doping. In addition, a hybridization gap is opened in the surface states when the thickness of the film is reduced to the two-dimensional limit. The work demonstrates an approach to manipulating the topological properties of TCI, which is of importance for future fundamental research and applications based on TCI.


Advanced Materials | 2015

Molecular Beam Epitaxy‐Grown SnSe in the Rock‐Salt Structure: An Artificial Topological Crystalline Insulator Material

Zhenyu Wang; Jianfeng Wang; Yunyi Zang; Qinghua Zhang; Jin-An Shi; Tian Jiang; Yan Gong; Can-Li Song; Shuai-Hua Ji; Lili Wang; Lin Gu; Ke He; Wenhui Duan; Xucun Ma; Xi Chen; Qi-Kun Xue

Z. Wang, J. Wang, Y. Zang, Dr. T. Jiang, Y. Gong, Prof. C.-L. Song, Prof. S.-H. Ji, Prof. L.-L. Wang, Prof. K. He, Prof. W. Duan, Prof. X. Ma, Prof. X. Chen, Prof. Q.-K. Xue State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing 100084 , China E-mail: [email protected]; [email protected] Q. Zhang, J.-A. Shi, Prof. L. Gu Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 , China Dr. T. Jiang College of Opto-Electronic Science and Engineering National University of Defense Technology Changsha , Hunan 410073 , China Prof. S.-H. Ji, Prof. L.-L. Wang, Prof. L. Gu, Prof. K. He, Prof. W. Duan, Prof. X. Ma, Prof. X. Chen, Prof. Q.-K. Xue Collaborative Innovation Center of Quantum Matter Beijing 100084 , P. R. China


Physical Review B | 2017

Voltage-controllable colossal magnetocrystalline anisotropy in single-layer transition metal dichalcogenides

Xuelei Sui; Tao Hu; Jianfeng Wang; Bing-Lin Gu; Wenhui Duan; Mao-sheng Miao

Materials with large magnetocrystalline anisotropy and strong electric field effects are highly needed to develop new types of memory devices based on electric field control of spin orientations. Instead of using modified transition metal films, we propose that certain monolayer transition metal dichalcogenides are the ideal candidate materials for this purpose. Using density functional calculations, we show that they exhibit not only a large magnetocrystalline anisotropy (MCA), but also colossal voltage modulation under external field. Notably, in some materials like CrSe_2 and FeSe_2, where spins show a strong preference for in-plane orientation, they can be switched to out-of-plane direction. This effect is attributed to the large band character alteration that the transition metal d-states undergo around the Fermi energy due to the electric field. We further demonstrate that strain can also greatly change MCA, and can help to improve the modulation efficiency while combined with an electric field.


Physical Review Letters | 2012

Electric-Field Control of Nonvolatile Magnetization in Co40Fe40B20/Pb(Mg1/3Nb2/3)(0.7)Ti0.3O3 Structure at Room Temperature

Sulin Zhang; Y. Zhao; Peisen Li; Jiarui Yang; Syed Rizwan; Jun Zhang; Jan Seidel; Tl Qu; Yuehua Yang; Zhihuang Luo; Qing He; T Zou; Qp Chen; Jianfeng Wang; Lifeng Yang; Y. Z. Sun; Y. Z. Wu; Xiangming Xiao; Xiaofeng Jin; J Huang; Chen Gao; Xiufeng Han; R. Ramesh


Physical Review B | 2014

Structural stability and topological surface states of the SnTe (111) surface

Jianfeng Wang; Junwei Liu; Yong Xu; Jian Wu; Bing-Lin Gu; Wenhui Duan


Physical Review Letters | 2015

Electronic analog of chiral metamaterial: Helicity-resolved filtering and focusing of Dirac fermions in thin films of topological materials

Lu Zhao; Jianfeng Wang; Junwei Liu; Yong Xu; Bing-Lin Gu; Qi-Kun Xue; Wenhui Duan


Physical Review B | 2017

Finite-size effects and spin texture of hourglass fermions in KHgSb films

Xiaoyu Liu; Chong Wang; Jianfeng Wang; Huaqing Huang; Bing-Lin Gu; Wenhui Duan


Bulletin of the American Physical Society | 2017

Voltage-Controllable Colossal Magnetocrystalline Anisotropy in Single Layer Dichalcogenides

Xuelei Sui; Tao Hu; Jianfeng Wang; Bing-Lin Gu; Wenhui Duan; Mao-sheng Miao


Bulletin of the American Physical Society | 2017

Tuning surface Dirac valleys by strain in topological crystalline insulators

Jianfeng Wang; Lu Zhao; Bing-Lin Gu; Wenhui Duan


Bulletin of the American Physical Society | 2015

Hidden topological surface states on SnTe (111) surface

Jianfeng Wang; Junwei Liu; Wenhui Duan

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Junwei Liu

Massachusetts Institute of Technology

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Ke He

Tsinghua University

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Lili Wang

Chinese Academy of Sciences

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