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Investigating the Physical Origin of Unconventional Low-Energy Excitations and Pseudogap Phenomena in Cuprate Superconductors

Yeh, N.-C. and Chen, C. T. and Beyer, A. D. and Lee, S.-I. (2007) Investigating the Physical Origin of Unconventional Low-Energy Excitations and Pseudogap Phenomena in Cuprate Superconductors. Chinese Journal of Physics, 45 (2-II). pp. 263-272. ISSN 0577-9073. https://resolver.caltech.edu/CaltechAUTHORS:20100506-093304405

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Abstract

We investigate the physical origin of unconventional low-energy excitations in cuprate superconductors by considering the effect of coexisting competing orders (CO) and superconductivity (SC) and of quantum fluctuations and other bosonic modes on the low-energy charge excitation spectra. By incorporating both SC and CO in the bare Green’s function and quantum phase fluctuations in the self-energy, we can consistently account for various empirical findings in both the hole- and electron-type cuprates, including the excess subgap quasiparticle density of states, “dichotomy” in the fluctuation-renormalized quasiparticle spectral density in momentum space, and the occurrence and magnitude of a low-energy pseudogap being dependent on the relative gap strength of CO and SC. Comparing these calculated results with experiments of ours and others, we suggest that there are two energy scales associated with the pseudogap phenomena, with the high-energy pseudogap probably of magnetic origin and the low-energy pseudogap associated with competing orders.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://PSROC.phys.ntu.edu.tw/cjpPublisherArticle
http://psroc.phys.ntu.edu.tw/cjp/find_content.php?year=2007&vol=45&no=2-IIPublisherArticle
ORCID:
AuthorORCID
Yeh, N.-C.0000-0002-1826-419X
Additional Information:© 2007. Received July 31, 2006. The work at Caltech is supported by the National Science Foundation through Grants #DMR-0405088, and at the Pohang University by the Ministry of Science and Technology of Korea. We thank Professor Xiao-Gang Wen for stimulating discussion.
Funders:
Funding AgencyGrant Number
NSFDMR-0405088
Pohang UniversityUNSPECIFIED
Issue or Number:2-II
Classification Code:PACS:74.72.-h, 74.50.+r, 74.25.Dw
Record Number:CaltechAUTHORS:20100506-093304405
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20100506-093304405
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18158
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:12 May 2010 19:49
Last Modified:03 Oct 2019 01:38

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