The Generalized Joint Density of States and Its Application to Exploring the Pairing Symmetry of High-<em>T</em><sub>c</sub> Superconductors

doi:10.1088/0256-307X/30/5/057401

Chin. Phys. Lett.

2013, Vol. 30

Issue (5): 057401 DOI: 10.1088/0256-307X/30/5/057401

CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

The Generalized Joint Density of States and Its Application to Exploring the Pairing Symmetry of High-T_c Superconductors

ZHANG Dan-Bo^1,2, HAN Qiang^1,2**, WANG Zi-Dan^2**

¹Department of Physics, Renmin University of China, Beijing 100872
²Department of Physics and Center of Theoretical and Computational Physics, The University of Hong Kong, Pokfulam Road, Hong Kong

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ZHANG Dan-Bo, HAN Qiang, WANG Zi-Dan 2013 Chin. Phys. Lett. 30 057401

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Abstract We introduce a generalized joint density of states (GJDOS), which incorporates the coherent factors into the JDOS, to study quasiparticle interference (QPI) in superconductors. The intimate relation between the Fourier-transformed local density of states and GJDOS is revealed: they correspond respectively to the real and imaginary parts of a generalized impurity-response function, and particularly share the same angular factors and singular boundaries, as seen from our approximate analytic results for d-wave superconductors. Remarkably, our numerical GJDOS analysis agrees well with the QPI patten of d-wave cuprates and s_±-wave iron-based superconductors. Moreover, we illustrate that the present GJDOS scenario can uncover the sign features of the superconducting gap and thus can be used to explore the pairing symmetry of the A_1?xFe_2?ySe₂ (A=K,Cs, etc) superconductors.

Received: 14 March 2013 Published: 31 May 2013

PACS:	74.20.-z	(Theories and models of superconducting state)
	74.25.Jb	(Electronic structure (photoemission, etc.))
	74.72.-h	(Cuprate superconductors)

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https://cpl.iphy.ac.cn/10.1088/0256-307X/30/5/057401 OR https://cpl.iphy.ac.cn/Y2013/V30/I5/057401

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	ZHANG Dan-Bo
	HAN Qiang
	WANG Zi-Dan

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