Prof. Shiping Feng
A. The field of research: Strongly correlated systems and cuprate superconductors

Cuprate superconductors are strongly correlated systems, and show many unusual physical properties, where the strong electron correlation manifests itself by a single-occupancy local constraint. The single common feature of cuprate superconductors is the presence of the two-dimensional CuO2 plane, then it is believed that the unusual physical properties are closely related to doped CuO2 planes. In particular, in the conventional superconductors, an energy gap exists in the electronic energy spectrum only below the superconducing transition temperature Tc, which is corresponding to the energy for breaking a Cooper pair of the charge carriers and creating two excited states. However, in cuprate superconductors above Tc but below a temperature T*, an energy gap called the normal-state pseudogap exists. Although the superconducing gap has a domelike shape of the doping dependence, the magnitude of the normal-state pseudogap is much larger than that of the superconducing gap in the underdoped regime, then it smoothly decreases upon increasing doping, and seems to merge with the superconducing gap in the overdoped regime, eventually disappearing together with superconductivity at the end of the superconducing dome. For study of the unusual physical properties of cuprate superconductors, we develop a fermion-spin theory [J. Phys. Condensed Matter, 16, 343-359 (2004); Phys. Rev. B49, 2368 (1994); Phil. Mag. 96, 1245 (2016); Physica C 551, 72 (2018); Int. J. Mod. Phys. B29, 1530009 (2015) (Review)], where the constrained electron operators are decoupled as the gauge invariant charge carrier and spin, with the charge carrier describes the charge degree of freedom together with some effects of the spin configuration rearrangements due to the presence of the charge carrier itself, while the spin operator describes the spin degree of freedom, then the electron local constraint for the single occupancy is satisfied in analytical calculations. Since these charge carrier and spin are gauge invariant, then in this sense, they are real and can be interpreted as the physical excitations. In this case, three basic low-energy excitations for the charge-carrier quasiparticle, spin excitation, and electron quasiparticle, respectively, emerge as the propagating modes in cuprtae superconductors, with the scattering of charge-carrier quasiparticles due to spin fluctuations that mainly governs the charge transport, and the scattering of spin excitations due to charge-carrier fluctuations dominates the spin response, while as a natural result of the charge-spin recombination, the electron quasiparticles are responsible for the electronic structure.

Based on the fermion-spin theory, we have developed a kinetic energy driven superconducting mechanism [Phys. Rev. B 68, 184501 (2003); Physica C 436, 14-24 (2006), Phys. Rev. B 85, 054509 (2012); Physica C517, 5-15 (2015); Physica C 551, 72 (2018); Int. J. Mod. Phys. B29, 1530009 (2015) (Review)], where the interaction between charge carriers and spins directly from the kinetic energy by exchanging spin excitations induces the normal-state pseudogap state in the particle-hole channel and superconducting-state in the particle-particle channel, therefore there is a coexistence of the superconducting gap and normal-state pseudogap in the whole superconducting dome. Moreover, this superconducting state is controlled by both charge carrier gap and quasiparticle coherent weight. Since this normal-state pseudogap is closely related to the quasiparticle coherent weight, and it is a necessary ingredient for superconductivity in cuprate superconductors. In particular, both the normal-state pseudogap and superconducting gap are dominated by one energy scale, and they are the result of the strong electron correlation. Within this framework, we study the normal- and superconducting-state properties of cuprate superconductors, and reproduce the main features of experimental results, including the charge transport, dynamical spin response from low-energy to high-energy, Meissner effect, and electronic structure.

B. University Education:
Ph. D., 1987, Theoretical Physics
Beijing Normal University (Mar., 1982-Jul., 1987)
B. Sc., 1982, Physics
Beijing Normal University (Mar., 1978-Jan., 1982)
C. Postdocs:
Oct., 1987 - Sept., 1989, Texas Center for Superconductivity
University of Houston
Houston, Texas 77204, U. S. A.
Jan., 1992 - Jan., 1994, Condensed Matter Research Group
International Centre for Theoretical Physics (ICTP)
P. O. Box 586
34100 Trieste, Italy
D. Teaching Experience:
June, 1994 - Professor
Department of Physics
Beijing Normal University
June, 1990 - June, 1994 Associate Professor
Department of Physics
Beijing Normal University
Sept., 1989 - June, 1990 Assistant Professor
Department of Physics
Beijing Normal University
Sept., 2000 - July, 2003 Chairman
Department of Physics
Beijing Normal University
E. The other positions:
  • Member of Editorial Board of SCIENCE CHINA Physics, Mechanics & Astronomy;
  • Member of Editorial Board of Acta Physica Sinica;
  • Member of Editorial Board of Chinese Physics B;
  • Member of Editorial Board of Communications in Theoretical Physics.
F. Review article:
Shiping Feng, Yu Lan, Huaisong Zhao, Lulin Kuang, Ling Qin, and Xixiao Ma, Kinetic energy driven superconductivity in cuprate superconductors, Int. J. Mod. Phys. B29, 1530009 (2015). (93 pages)
G. The representative publications:
  1. Shiping Feng, Yu Lan, Huaisong Zhao, Lulin Kuang, Ling Qin, and Xixiao Ma, Kinetic energy driven superconductivity in cuprate superconductors, Int. J. Mod. Phys. B29, 1530009 (2015). Review article
  2. Shiping Feng, Lulin Kuang, and Huaisong Zhao, Electronic structure of cuprate superconductors in a full charge-spinrecombination scheme, Physica C517, 5-15 (2015); Shiping Feng, Deheng Gao, and Huaisong Zhao, Charge order driven by Fermi-arc instability and its connection with pseudogap in cuprate superconductors, Phil. Mag. 96, 1245-1262 (2016); Huaisong Zhao, Deheng Gao, and Shiping Feng, Pseudogap-generated a coexistence of Fermi arcs and Fermi pockets in cuprate superconductors, Physica C534, 1-8 (2017); Deheng Gao, Yiqun Liu, Huaisong Zhao, Yingping Mou, and Shiping Feng, Interplay between charge order and superconductivity in cuprate superconductors, Physica C 551, 72-81 (2018).
  3. Lulin Kuang, Yu Lan, and Shiping Feng, Dynamical spin response in cuprate superconductors from low-energy to high-energy, J. Magn. Magn. Mater. 374, 624-633 (2015).
  4. Ling Qin, Jihong Qin, and Shiping Feng, Pseudogap and charge dynamics in doped cuprates, Physica C497, 77-83 (2014); Ling Qin, Jihong Qin, and Shiping Feng, Effect of the pseudogap on the infrared response in cuprate superconductors, Phil. Mag. Lett. 94, 387-394 (2014).
  5. Shiping Feng, Huaisong Zhao, and Zheyu Huang, Two gaps with one energy scale in cuprate superconductors, Phys. Rev. B85, 054509 (2012).
  6. Shiping Feng, Zheyu Huang, and Huaisong Zhao, Doping dependence of Meissner effect in cuprate superconductors, Physica C470, 1968-1976 (2010); Zheyu Huang, Huaisong Zhao, and Shiping Feng, Magnetic field induced reduction of the low-temperature superfluid density in cuprate superconductors, Phys. Rev. B83, 144524 (2011).
  7. Shiping Feng, Tianxing Ma, and Huaiming Guo, Magnetic nature of superconductivity in doped cuprates, Physica C436, 14-24 (2006).
  8. Shiping Feng, Jihong Qin, and Tianxing Ma, A gauge invariant dressed holon and spinon description of the normal-state of underdoped cuprates, J. Phys. Condensed Matter, 16, 343-359 (2004).
  9. Shiping Feng, Kinetic energy driven superconductivity in doped cuprates, Phys. Rev. B68, 184501-1-7 (2003).
  10. Shiping Feng, Z. B. Su,, and L.Yu, Fermion-spin transformation to implement the charge-spin separation, Phys. Rev. B49, 2368 (1994).
H. The major publications from 1986 to 2018:
2018; 2017; 2016; 2015; 2014; 2013; 2012; 2011; 2010; 2009; 2008; 2007; 2006; 2005; 2004; 2003;
2002; 2001; 2000; 1999; 1998; 1997; 1996; 1995; 1994; 1993; 1992; 1990; 1989; 1988; 1987; 1986
Mailing Address: Department of Physics
Beijing Normal University
Beijing 100875
China
E-mail: spfeng@bnu.edu.cn
Phone/Fax: (+86)-10-58806408