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The Raman spectrum of a KNO3 single crystal was measured at both room and liquid-nitrogen temperatures. Lattice-dynamical calculations, based on the rigid-ion approximation and empirical potentials, were performed. The possibility of a phase transition at 217 K was investigated by measuring the temperature dependence of the Raman spectrum. ©1992 The… (More)

- Daqing Liu, Shuyue Chen, Ning Ma, Xiang Zhao, Zhuo Xu
- Microscopy and microanalysis : the official…
- 2015

We conducted a semiclassical study on carrier movement in curved graphene. A previous attempt was made to show that curved graphene is a readily available and cheap laboratory material used to study general relativity effects, especially if the electron energies satisfy 4μeV ≪ |E| ≪ 3eV. Furthermore, a gravitational-like lens can be constructed based on a… (More)

- Daqing Liu, Shengli Zhang
- 2008

Utilizing a complete Lorentz-covariant and local-gauge-invariant formulation, we discuss graphene response to arbitrary external electric field. The relation, which is called as Kramers-Krönig relation in the paper, between imaginary part and real part of ac conductivity is given. We point out there exists an ambiguity in the conductivity computing,… (More)

- Daqing Liu, Jiming Wu
- 2009

We study the vacuum structure in free QED utilizing the technic of the second quantization. There is argument of the gauge independence of physical states in the paper. We give an effect characterizing the second quantization. How to produce general physical states is also shown.

- Daqing Liu
- 2009

In a discrete form of the second quantization, the gauge independencies of all the physical states including vacuum in QED are restudied through a new approach. We also discuss an interesting phenomenon attributed to vacuum effect and come up with a procedure to produce general physical states.

- Daqing Liu, Shueyue Chen, Shengli Zhang, Ning Ma
- Journal of physics. Condensed matter : an…
- 2017

Basing on a self-consistent method, we predict theoretically that there exists intrinsic plasmaron in graphene at nonzero temperature and it is a well defined mode, as shown by the result of Landau damping. We find that there are sharp differences between the discussed system and the QCD/QED system. Firstly, the thermal mass is proportional to… (More)

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