https://doi.org/10.1140/epjc/s10052-019-7203-8
Regular Article - Theoretical Physics
Dynamical gap driven by Yukawa coupling in holography
1
Center for Gravitation and Cosmology, College of Physical Science and Technology, Yangzhou University, Yangzhou, 225009, China
2
School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai, 200240, China
* e-mail: jianpinwu@yzu.edu.cn
Received:
19
August
2018
Accepted:
6
August
2019
Published online:
19
August
2019
We provide a novel mechanism to model the emergence of the dynamical gap in holography. It is implemented by introducing a novel coupling term, Yukawa interaction between the scalar field and the spinor field, in the Dirac action. By studying the fermionic spectral function, we find that the Yukawa coupling drives a dynamical gap formation. Moreover, the Yukawa coupling results in rearrangements of the spectrum at low frequency region but the density of states (DOS) for all Yukawa coupling parameter tend to the same value at the high frequency region, which is different from the well studied case with dipole coupling. We also study the evolution of the spectral function with temperature. We find that with the increase of temperature, the gap closes.
© The Author(s), 2019
