Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session E44: New Developments in STM on Surfaces of Unconventional Superconductors and Related Systems
8:00 AM–9:48 AM,
Tuesday, March 5, 2019
BCEC Room: 210C
Sponsoring Unit: DCMP
Chair: Ilya Eremin, Ruhr University Bochum
Abstract: E44.00001 : Determination of the superconducting gap sign by the phase referenced method: successful practice in cuprate and several iron based superconductors*
8:00 AM–8:36 AM
In the superconducting state, quasi-particles (QPs) will be generated by thermal or pair breaking. These QPs with Bogoliubov dispersion are scattered from one momentum k1 to another k2 forming a standing wave with wave vector q=k1-k2. All these standing waves interfere each other and form a particular pattern in the real space (QPI). By using STM we can measure these patterns. Through the Fourier transform on QPI patterns we can not only get the Fermi surface contour, but also obtain the gap feature, including the magnitude and sign for different q vectors. This was called as the phase referenced QPI. Following this idea we have successfully detected the gap sign reversal in several iron based superconductors with and without the hole pockets. We can also directly visualize the d-wave gap in the typical cuprate superconductor Bi-2212.
1.Zengyi Du, Peter Hirschfield, Hai-Hu Wen et al., Nature Physics 14, 134(2018).
2.Qiangqiang Gu, Huan Yang, Hai-Hu Wen et al., Phys. Rev. B 98, 134503 (2018).
3.Mingyang Chen, Huan Yang, Qianghua Wang, Hai-Hu Wen et al. arXiv Condmat:1810.06414.
4.Qiangqiang Gu, Huan Yang, Hai-Hu Wen et al., arXiv Condmat:1808.06215.
*This work has been supported by the Chinese National Science Foudation and the Ministry of Science and Technology of China.
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