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

Based on a self-consistent method, we predict theoretically that there exist intrinsic plasmarons in graphene at nonzero temperature, with 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 [Formula: see… (More)

- 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. PACS: 03.65.Db, 12.70.Ds

- Yin Chen, Daqing Liu, Yang Liu, Jimin Wu
- 2008

To apply lattice QCD in the calculation of glueball spectrum it is needed firstly to know associated operators acting on vacuum. We show how to find all the independent representations and operators, of group SO(3) at different dimension, since the work is not trivial. Then, we decompose these representation into irreducible representation of O group, which… (More)

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