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While electron-based plasmons in metals and n-type semiconductors have been widely explored, their hole-based counterparts in p-type semiconductors remain largely underexplored due to low hole densities and large effective masses that push plasmon response to the far-infrared with strong damping. Here, we present conclusive experimental evidence of low-loss, room-temperature hole plasmons in the mid-infrared regime, realized in epitaxial p-type scandium nitride thin films. Enabled by a high hole concentration of \u223c1.4 \u00d7 1020 cm\u20133 and mobility of \u223c21 cm2 V\u20131 s\u20131, these hole plasmons exhibit strong confinement with moderate damping. Furthermore, by tuning hole concentrations to spectrally overlap the plasmonic resonance with surface phonon polaritons, we demonstrate a mixed hole-plasmon\u2013LO-phonon interaction giving rise to broadband hybrid absorption response. These results establish robust hole plasmonics in p-type semiconductors for infrared nanophotonic devices.<\/jats:p>","DOI":"10.1021\/acs.nanolett.6c02445","type":"journal-article","created":{"date-parts":[[2026,7,16]],"date-time":"2026-07-16T19:44:41Z","timestamp":1784231081000},"page":"9614-9621","source":"Crossref","is-referenced-by-count":0,"title":["Room-Temperature\nHole Plasmons and Plasmon-Phonon\nInteractions in Epitaxial\n                    <i>p<\/i>\n                    -Type Scandium\nNitride"],"prefix":"10.1021","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1138-7557","authenticated-orcid":true,"given":"Prasanna","family":"Das","sequence":"first","affiliation":[{"name":"Jawaharlal Nehru Centre for Advanced Scientific Research , , ,","place":["Bangalore, India, 560064"]},{"name":"Jawaharlal Nehru Centre for Advanced Scientific Research , , ,","place":["Bangalore, India, 560064"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Debmalya","family":"Mukhopadhyay","sequence":"additional","affiliation":[{"name":"Jawaharlal Nehru Centre for Advanced Scientific Research , , ,","place":["Bangalore, India, 560064"]},{"name":"Jawaharlal Nehru Centre for Advanced Scientific Research , , ,","place":["Bangalore, India, 560064"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-0369-0750","authenticated-orcid":true,"given":"Emma R.","family":"Bartelsen","sequence":"additional","affiliation":[{"name":"Vanderbilt University , , , ,","place":["Nashville, Tennessee, United States, 37212"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Renuka","family":"Karanje","sequence":"additional","affiliation":[{"name":"Jawaharlal Nehru Centre for Advanced Scientific Research , , ,","place":["Bangalore, India, 560064"]},{"name":"Jawaharlal Nehru Centre for Advanced Scientific Research , , ,","place":["Bangalore, India, 560064"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Krishna Chand","family":"Maurya","sequence":"additional","affiliation":[{"name":"Jawaharlal Nehru Centre for Advanced Scientific Research , , ,","place":["Bangalore, India, 560064"]},{"name":"Jawaharlal Nehru Centre for Advanced Scientific Research , , ,","place":["Bangalore, India, 560064"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pavithra","family":"Rao","sequence":"additional","affiliation":[{"name":"Indian Institute of Science , , ,","place":["Bangalore, India, 560012"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ashalatha Indiradevi","family":"Kamalasanan Pillai","sequence":"additional","affiliation":[{"name":"The University of Sydney , , , ,","place":["Camperdown, New South Wales, Australia, 2006"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shankar Kumar","family":"Selvaraja","sequence":"additional","affiliation":[{"name":"Indian Institute of Science , , ,","place":["Bangalore, India, 560012"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1852-5580","authenticated-orcid":true,"given":"Magnus","family":"Garbrecht","sequence":"additional","affiliation":[{"name":"The University of Sydney , , , ,","place":["Camperdown, New South Wales, Australia, 2006"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0374-2168","authenticated-orcid":true,"given":"Joshua D.","family":"Caldwell","sequence":"additional","affiliation":[{"name":"Vanderbilt University , , , ,","place":["Nashville, Tennessee, United States, 37212"]},{"name":"Vanderbilt University , , , ,","place":["Nashville, Tennessee, United States, 37212"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0837-1506","authenticated-orcid":true,"given":"Bivas","family":"Saha","sequence":"additional","affiliation":[{"name":"Jawaharlal Nehru Centre for Advanced Scientific Research , , ,","place":["Bangalore, India, 560064"]},{"name":"Jawaharlal Nehru Centre for Advanced Scientific Research , , ,","place":["Bangalore, India, 560064"]},{"name":"Jawaharlal Nehru Centre for Advanced Scientific Research , , ,","place":["Bangalore, India, 560064"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,7,16]]},"reference":[{"issue":"19","key":"2026072909074534300_cit1","doi-asserted-by":"publisher","first-page":"1501","DOI":"10.1002\/1521-4095(200110)13:19&lt;1501::AID-ADMA1501&gt;3.0.CO;2-Z","article-title":"Plasmonics - A Route to Nanoscale Optical Devices","volume":"13","author":"Maier","year":"2001","journal-title":"Adv. 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