Pairing Mechanism of the FeSe monolayer and related
Systems: Dynamical Tuning of Pairing Cutoff Energy
- Title
- Pairing Mechanism of the FeSe monolayer and related
Systems: Dynamical Tuning of Pairing Cutoff Energy
- Authors
- BANG, YUNKYU
- Date Issued
- 2018-07-18
- Publisher
- IUPAP (International Union of Pure and Applied Physics), IEEE Magnetics
- Abstract
- There are a group of FeSe systems: FeSe/SrTiO3 monolayer system
(Tc~60-100K) and other heavily electron-doped iron selenide (HEDIS)
compounds such as AxFe2-ySe2 (A=K, Rb, Cs, Tl, etc.) (Tc~30-40K),
(Li1-xFexOH)FeSe (Tc~40K), etc. These systems have all very high
Tc (30K -100K) despite having only the electron Fermi surfaces (FSs) but no
hole FS. Here we propose a unifying pairing mechanism [1] based on a new
concept: dynamical tuning of pairing cutoff energy. With this mechanism,
I show how the incipient band without a Fermi surface can participate pairing
interaction through RG process and the system forms the s++ wave state only
with the electron pockets. In this way, the HEDIS system can achieve the
maximum Tc , stored in the system, and yet avoid the detrimental impurity
pair breaking scattering. Our theory not only provides a unifying pairing
mechanism for all HEDIS system, but also naturally explains the puzzling
double dome structure of the phase diagram of Tc versus tuning parameter
(doping, pressure, etc) [2, 3].
[1]. Y. Bang, New J. Physics, 18 113054 (2016); ibid, 16 023029 (2014).
[2]. C. L. Song et al, Phys. Rev. Lett. 116 157001 (2016). [3]. L. L. Sun
et al, Nature 483 67 (2012).
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/97856
- Article Type
- Conference
- Citation
- 21ST INTERNATIONAL CONFERENCE ON MAGNETISM (ICM_2018), page. 441, 2018-07-18
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