{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,8]],"date-time":"2026-02-08T12:15:46Z","timestamp":1770552946265,"version":"3.49.0"},"reference-count":40,"publisher":"IOP Publishing","issue":"13","license":[{"start":{"date-parts":[[2019,2,6]],"date-time":"2019-02-06T00:00:00Z","timestamp":1549411200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/publishingsupport.iopscience.iop.org\/iop-standard\/v1"},{"start":{"date-parts":[[2019,2,6]],"date-time":"2019-02-06T00:00:00Z","timestamp":1549411200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"}],"funder":[{"DOI":"10.13039\/501100001824","name":"Grantov\u00e1 Agentura \u010cesk\u00e9 Republiky","doi-asserted-by":"crossref","award":["GJ15-14523Y"],"award-info":[{"award-number":["GJ15-14523Y"]}],"id":[{"id":"10.13039\/501100001824","id-type":"DOI","asserted-by":"crossref"}]},{"name":"Ministry of Education, Youth and Sports of the Czech Republic","award":["CEITEC 2020 (LQ1601)"],"award-info":[{"award-number":["CEITEC 2020 (LQ1601)"]}]}],"content-domain":{"domain":["iopscience.iop.org"],"crossmark-restriction":false},"short-container-title":["J. Phys.: Condens. Matter"],"published-print":{"date-parts":[[2019,4,3]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Motivated by similarities between cuprate superconductors and two-leg ladder copper-oxide compounds and in order to obtain a better understanding of optical properties of cuprate superconductors we have studied the\n                    <jats:italic>c<\/jats:italic>\n                    -axis (along the ladder) optical conductivity\n                    <jats:inline-formula\/>\n                    of a doped\n                    <jats:inline-formula\/>\n                    two-leg ladder. Using exact diagonalization, we have calculated the conductivity and related quantities for cyclic ladders of up to 13 rungs. In agreement with results of an early study by Hayward and coworkers (Hayward\n                    <jats:italic>et al<\/jats:italic>\n                    1996\n                    <jats:italic>Phys. Rev<\/jats:italic>\n                    . B\n                    <jats:bold>53<\/jats:bold>\n                    8863) we find that\n                    <jats:inline-formula\/>\n                    consists of a Drude peak at zero frequency and an absorption band in the infrared region that is separated from the former by a pseudogap. The width of the pseudogap\n                    <jats:inline-formula\/>\n                    increases with increasing\n                    <jats:italic>J<\/jats:italic>\n                    \/\n                    <jats:italic>t<\/jats:italic>\n                    , in parallel with an increase of the magnitude\n                    <jats:inline-formula\/>\n                    of the gap in the quasiparticle excitation spectra. Our central finding is that\n                    <jats:inline-formula\/>\n                    , where\n                    <jats:inline-formula\/>\n                    is the magnitude of the gap in the spin excitation spectra. We demonstrate that this approximate relation can be understood in terms of a phenomenological model involving a superconducting ladder and a coupling between charged quasiparticles and spin excitations. The relation is remarkably similar to the one between experimental values of the energy scale of a dip in the in-plane optical conductivity, the superconducting gap\n                    <jats:inline-formula\/>\n                    and the energy of the spin-resonance in cuprate superconductors (for a recent discussion of the optical data, see \u0160op\u00edk\n                    <jats:italic>et al<\/jats:italic>\n                    2015\n                    <jats:italic>New J. Phys<\/jats:italic>\n                    .\n                    <jats:bold>17<\/jats:bold>\n                    053022). Our findings support the point of view that low energy infrared active excited states of cuprate superconductors can be viewed as consisting of two charged quasiparticles connected with pair-breaking and a spin excitation.\n                  <\/jats:p>","DOI":"10.1088\/1361-648x\/aafd10","type":"journal-article","created":{"date-parts":[[2019,1,9]],"date-time":"2019-01-09T17:45:30Z","timestamp":1547055930000},"page":"135502","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["Pseudogap in the\n                    <i>c<\/i>\n                    -axis (along the ladder) optical conductivity of\n                    <i>t<\/i>\n                    \u2009\u2009\u2212\u2009\u2009\n                    <i>J<\/i>\n                    ladders and its quasiparticle interpretation"],"prefix":"10.1088","volume":"31","author":[{"given":"Paul\u00edna","family":"Karlub\u00edkov\u00e1","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hana","family":"R\u016f\u017ei\u010dkov\u00e1","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ji\u0159\u00ed","family":"Chaloupka","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8520-4966","authenticated-orcid":false,"given":"Dominik","family":"Munzar","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"266","published-online":{"date-parts":[[2019,2,6]]},"reference":[{"key":"cmaafd10bib001","doi-asserted-by":"publisher","first-page":"618","DOI":"10.1126\/science.271.5249.618","type":"journal-article","volume":"271","author":"For an early review","year":"1996","journal-title":"Science"},{"key":"cmaafd10bib002","doi-asserted-by":"publisher","first-page":"1525","DOI":"10.1088\/0034-4885\/62\/11\/202","type":"journal-article","volume":"62","author":"For a review","year":"1999","journal-title":"Rep. 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All rights, including for text and data mining, AI training, and similar technologies, are reserved.","name":"copyright_information","label":"Copyright Information"},{"value":"2018-10-09","name":"date_received","label":"Date Received","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2018-12-27","name":"date_accepted","label":"Date Accepted","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2019-02-06","name":"date_epub","label":"Online publication date","group":{"name":"publication_dates","label":"Publication dates"}}]}}