{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,10]],"date-time":"2026-06-10T05:51:22Z","timestamp":1781070682664,"version":"3.54.1"},"reference-count":50,"publisher":"AIP Publishing","issue":"11","funder":[{"DOI":"10.13039\/501100001659","name":"Deutsche Forschungsgemeinschaft","doi-asserted-by":"publisher","award":["EXC 2033\u2013390677874"],"award-info":[{"award-number":["EXC 2033\u2013390677874"]}],"id":[{"id":"10.13039\/501100001659","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2023,3,21]]},"abstract":"<jats:p>Intra-band transitions in colloidal quantum dots (QDs) are promising for opto-electronic applications in the mid-IR spectral region. However, such intra-band transitions are typically very broad and spectrally overlapping, making the study of individual excited states and their ultrafast dynamics very challenging. Here, we present the first full spectrum two-dimensional continuum infrared (2D CIR) spectroscopy study of intrinsically n-doped HgSe QDs, which exhibit mid-infrared intra-band transitions in their ground state. The obtained 2D CIR spectra reveal that underneath the broad absorption line shape of \u223c500\u00a0cm\u22121, the transitions exhibit surprisingly narrow intrinsic linewidths with a homogeneous broadening of 175\u2013250\u00a0cm\u22121. Furthermore, the 2D IR spectra are remarkably invariant, with no sign\u00a0of spectral diffusion dynamics at waiting times up to 50\u00a0ps. Accordingly, we attribute the large static inhomogeneous broadening to the distribution of size and doping level of the QDs. In addition, the two higher-lying P-states of the QDs can be clearly identified in the 2D IR spectra along the diagonal with a cross-peak. However, there is no indication of cross-peak dynamics indicating that, despite the strong spin\u2013orbit coupling in HgSe, transitions between the P-states must be longer than our maximum waiting time of 50\u00a0ps. This study illustrates a new frontier of 2D IR spectroscopy enabling the study of intra-band carrier dynamics in nanocrystalline materials across the entire mid-infrared spectrum.<\/jats:p>","DOI":"10.1063\/5.0139795","type":"journal-article","created":{"date-parts":[[2023,2,27]],"date-time":"2023-02-27T16:37:46Z","timestamp":1677515866000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":6,"title":["Narrow homogeneous linewidths and slow cooling dynamics across infrared intra-band transitions in n-doped HgSe colloidal quantum dots"],"prefix":"10.1063","volume":"158","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6479-7480","authenticated-orcid":false,"given":"Ashley M.","family":"Stingel","sequence":"first","affiliation":[{"name":"Physical Chemistry II, Faculty of Chemistry and Biochemistry, Ruhr-University Bochum 1 , Bochum, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5403-2839","authenticated-orcid":false,"given":"Jari","family":"Leemans","sequence":"additional","affiliation":[{"name":"Physics and Chemistry of Nanostructures Group, Department of Chemistry, Faculty of Sciences, Ghent University 2 , 9000 Gent, Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7041-3375","authenticated-orcid":false,"given":"Zeger","family":"Hens","sequence":"additional","affiliation":[{"name":"Physics and Chemistry of Nanostructures Group, Department of Chemistry, Faculty of Sciences, Ghent University 2 , 9000 Gent, Belgium"},{"name":"NoLIMITS Center for Non-Linear Microscopy and Spectroscopy, Ghent University 3 , 9000 Gent, Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7217-8738","authenticated-orcid":false,"given":"Pieter","family":"Geiregat","sequence":"additional","affiliation":[{"name":"Physics and Chemistry of Nanostructures Group, Department of Chemistry, Faculty of Sciences, Ghent University 2 , 9000 Gent, Belgium"},{"name":"NoLIMITS Center for Non-Linear Microscopy and Spectroscopy, Ghent University 3 , 9000 Gent, Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9821-700X","authenticated-orcid":false,"given":"Poul B.","family":"Petersen","sequence":"additional","affiliation":[{"name":"Physical Chemistry II, Faculty of Chemistry and Biochemistry, Ruhr-University Bochum 1 , Bochum, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2023,3,15]]},"reference":[{"key":"2024021219254007600_c1","doi-asserted-by":"publisher","first-page":"2125","DOI":"10.1038\/s41467-019-10170-8","volume":"10","year":"2019","journal-title":"Nat. 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