[2401.01873] Observation of the Magnonic Dicke Superradiant Phase Transition

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However, this phenomenon, the superradiant phase transition (SRPT), is forbidden by a no-go theorem due to the existence of the diamagnetic term in the Hamiltonian. Here, we present spectroscopic evidence for a magnonic SRPT in ErFeO$_3$, where the role of the photonic mode (two-level atoms) in the photonic SRPT is played by an Fe$^{3+}$ magnon mode (Er$^{3+}$ spins). The absence of the diamagnetic term in the Fe$^{3+}$-Er$^{3+}$ exchange coupling ensures that the no-go theorem does not apply. Terahertz and gigahertz magnetospectroscopy experiments revealed the signatures of the SRPT -- a kink and a softening, respectively, of two spin-magnon hybridized modes at the critical point."/> <meta name="twitter:site" content="@arxiv"/> <meta name="twitter:card" content="summary"/> <meta name="twitter:title" content="Observation of the Magnonic Dicke Superradiant Phase Transition"/> <meta name="twitter:description" content="Two-level atoms coupled with single-mode cavity photons are predicted to exhibit a quantum phase transition when the coupling strength exceeds a critical value, entering a phase in which atomic..."/> <meta name="twitter:image" content="https://static.arxiv.org/icons/twitter/arxiv-logo-twitter-square.png"/> <meta name="twitter:image:alt" content="arXiv logo"/> <link rel="stylesheet" media="screen" type="text/css" href="/static/browse/0.3.4/css/tooltip.css"/><link rel="stylesheet" media="screen" type="text/css" href="https://static.arxiv.org/js/bibex-dev/bibex.css?20200709"/> <script src="/static/browse/0.3.4/js/mathjaxToggle.min.js" type="text/javascript"></script> <script src="//code.jquery.com/jquery-latest.min.js" type="text/javascript"></script> <script src="//cdn.jsdelivr.net/npm/js-cookie@2/src/js.cookie.min.js" type="text/javascript"></script> <script src="//cdn.jsdelivr.net/npm/dompurify@2.3.5/dist/purify.min.js"></script> <script src="/static/browse/0.3.4/js/toggle-labs.js?20241022" type="text/javascript"></script> <script src="/static/browse/0.3.4/js/cite.js" type="text/javascript"></script><meta name="citation_title" content="Observation of the Magnonic Dicke Superradiant Phase Transition" /><meta name="citation_author" content="Kim, Dasom" /><meta name="citation_author" content="Dasgupta, Sohail" /><meta name="citation_author" content="Ma, Xiaoxuan" /><meta name="citation_author" content="Park, Joong-Mok" /><meta name="citation_author" content="Wei, Hao-Tian" /><meta name="citation_author" content="Luo, Liang" /><meta name="citation_author" content="Doumani, Jacques" /><meta name="citation_author" content="Li, Xinwei" /><meta name="citation_author" content="Yang, Wanting" /><meta name="citation_author" content="Cheng, Di" /><meta name="citation_author" content="Kim, Richard H. J." /><meta name="citation_author" content="Everitt, Henry O." /><meta name="citation_author" content="Kimura, Shojiro" /><meta name="citation_author" content="Nojiri, Hiroyuki" /><meta name="citation_author" content="Wang, Jigang" /><meta name="citation_author" content="Cao, Shixun" /><meta name="citation_author" content="Bamba, Motoaki" /><meta name="citation_author" content="Hazzard, Kaden R. A." /><meta name="citation_author" content="Kono, Junichiro" /><meta name="citation_date" content="2024/01/03" /><meta name="citation_online_date" content="2024/01/03" /><meta name="citation_pdf_url" content="http://arxiv.org/pdf/2401.01873" /><meta name="citation_arxiv_id" content="2401.01873" /><meta name="citation_abstract" content="Two-level atoms coupled with single-mode cavity photons are predicted to exhibit a quantum phase transition when the coupling strength exceeds a critical value, entering a phase in which atomic polarization and photonic field are finite even at zero temperature and without external driving. However, this phenomenon, the superradiant phase transition (SRPT), is forbidden by a no-go theorem due to the existence of the diamagnetic term in the Hamiltonian. Here, we present spectroscopic evidence for a magnonic SRPT in ErFeO$_3$, where the role of the photonic mode (two-level atoms) in the photonic SRPT is played by an Fe$^{3+}$ magnon mode (Er$^{3+}$ spins). The absence of the diamagnetic term in the Fe$^{3+}$-Er$^{3+}$ exchange coupling ensures that the no-go theorem does not apply. Terahertz and gigahertz magnetospectroscopy experiments revealed the signatures of the SRPT -- a kink and a softening, respectively, of two spin-magnon hybridized modes at the critical point." /> </head> <body class="with-cu-identity"> <div class="flex-wrap-footer"> <header> <a href="#content" class="is-sr-only">Skip to main content</a>  <div class="columns is-vcentered is-hidden-mobile" id="cu-identity"> <div class="column" id="cu-logo"> <a href="https://www.cornell.edu/"><img src="/static/browse/0.3.4/images/icons/cu/cornell-reduced-white-SMALL.svg" alt="Cornell University" /></a> </div><div class="column" id="support-ack"> <span id="support-ack-url">We gratefully acknowledge support from the Simons Foundation, <a href="https://info.arxiv.org/about/ourmembers.html">member institutions</a>, and all contributors.</span> <a href="https://info.arxiv.org/about/donate.html" class="btn-header-donate">Donate</a> </div> </div> <div id="header" class="is-hidden-mobile"> <a aria-hidden="true" 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href="https://arxiv.org/search/quant-ph?searchtype=author&query=Kim,+D" rel="nofollow">Dasom Kim</a>, <a href="https://arxiv.org/search/quant-ph?searchtype=author&query=Dasgupta,+S" rel="nofollow">Sohail Dasgupta</a>, <a href="https://arxiv.org/search/quant-ph?searchtype=author&query=Ma,+X" rel="nofollow">Xiaoxuan Ma</a>, <a href="https://arxiv.org/search/quant-ph?searchtype=author&query=Park,+J" rel="nofollow">Joong-Mok Park</a>, <a href="https://arxiv.org/search/quant-ph?searchtype=author&query=Wei,+H" rel="nofollow">Hao-Tian Wei</a>, <a href="https://arxiv.org/search/quant-ph?searchtype=author&query=Luo,+L" rel="nofollow">Liang Luo</a>, <a href="https://arxiv.org/search/quant-ph?searchtype=author&query=Doumani,+J" rel="nofollow">Jacques Doumani</a>, <a href="https://arxiv.org/search/quant-ph?searchtype=author&query=Li,+X" rel="nofollow">Xinwei Li</a>, <a href="https://arxiv.org/search/quant-ph?searchtype=author&query=Yang,+W" rel="nofollow">Wanting Yang</a>, <a href="https://arxiv.org/search/quant-ph?searchtype=author&query=Cheng,+D" rel="nofollow">Di Cheng</a>, <a href="https://arxiv.org/search/quant-ph?searchtype=author&query=Kim,+R+H+J" rel="nofollow">Richard H. J. Kim</a>, <a href="https://arxiv.org/search/quant-ph?searchtype=author&query=Everitt,+H+O" rel="nofollow">Henry O. Everitt</a>, <a href="https://arxiv.org/search/quant-ph?searchtype=author&query=Kimura,+S" rel="nofollow">Shojiro Kimura</a>, <a href="https://arxiv.org/search/quant-ph?searchtype=author&query=Nojiri,+H" rel="nofollow">Hiroyuki Nojiri</a>, <a href="https://arxiv.org/search/quant-ph?searchtype=author&query=Wang,+J" rel="nofollow">Jigang Wang</a>, <a href="https://arxiv.org/search/quant-ph?searchtype=author&query=Cao,+S" rel="nofollow">Shixun Cao</a>, <a href="https://arxiv.org/search/quant-ph?searchtype=author&query=Bamba,+M" rel="nofollow">Motoaki Bamba</a>, <a href="https://arxiv.org/search/quant-ph?searchtype=author&query=Hazzard,+K+R+A" rel="nofollow">Kaden R. A. Hazzard</a>, <a href="https://arxiv.org/search/quant-ph?searchtype=author&query=Kono,+J" rel="nofollow">Junichiro Kono</a></div> <div id="download-button-info" hidden>View a PDF of the paper titled Observation of the Magnonic Dicke Superradiant Phase Transition, by Dasom Kim and 18 other authors</div> <a class="mobile-submission-download" href="/pdf/2401.01873">View PDF</a> <a class="mobile-submission-download" href="https://arxiv.org/html/2401.01873v1">HTML (experimental)</a> <blockquote class="abstract mathjax"> <span class="descriptor">Abstract:</span>Two-level atoms coupled with single-mode cavity photons are predicted to exhibit a quantum phase transition when the coupling strength exceeds a critical value, entering a phase in which atomic polarization and photonic field are finite even at zero temperature and without external driving. However, this phenomenon, the superradiant phase transition (SRPT), is forbidden by a no-go theorem due to the existence of the diamagnetic term in the Hamiltonian. Here, we present spectroscopic evidence for a magnonic SRPT in ErFeO$_3$, where the role of the photonic mode (two-level atoms) in the photonic SRPT is played by an Fe$^{3+}$ magnon mode (Er$^{3+}$ spins). The absence of the diamagnetic term in the Fe$^{3+}$-Er$^{3+}$ exchange coupling ensures that the no-go theorem does not apply. Terahertz and gigahertz magnetospectroscopy experiments revealed the signatures of the SRPT -- a kink and a softening, respectively, of two spin-magnon hybridized modes at the critical point. </blockquote>  <div class="metatable"> <table summary="Additional metadata"><tr> <td class="tablecell label">Subjects:</td> <td class="tablecell subjects"> <span class="primary-subject">Quantum Physics (quant-ph)</span>; Materials Science (cond-mat.mtrl-sci); Optics (physics.optics)</td> </tr><tr> <td class="tablecell label">Cite as:</td> <td class="tablecell arxivid"><span class="arxivid"><a href="https://arxiv.org/abs/2401.01873">arXiv:2401.01873</a> [quant-ph]</span></td> </tr> <tr> <td class="tablecell label"> </td> <td class="tablecell arxividv">(or <span class="arxivid"> <a href="https://arxiv.org/abs/2401.01873v1">arXiv:2401.01873v1</a> [quant-ph]</span> for this version) </td> </tr> <tr> <td class="tablecell label"> </td> <td class="tablecell arxivdoi"> <a href="https://doi.org/10.48550/arXiv.2401.01873" id="arxiv-doi-link">https://doi.org/10.48550/arXiv.2401.01873</a><div class="button-and-tooltip"> <button class="more-info" aria-describedby="more-info-desc-1"> <svg height="15" role="presentation" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path fill="currentColor" d="M256 8C119.043 8 8 119.083 8 256c0 136.997 111.043 248 248 248s248-111.003 248-248C504 119.083 392.957 8 256 8zm0 110c23.196 0 42 18.804 42 42s-18.804 42-42 42-42-18.804-42-42 18.804-42 42-42zm56 254c0 6.627-5.373 12-12 12h-88c-6.627 0-12-5.373-12-12v-24c0-6.627 5.373-12 12-12h12v-64h-12c-6.627 0-12-5.373-12-12v-24c0-6.627 5.373-12 12-12h64c6.627 0 12 5.373 12 12v100h12c6.627 0 12 5.373 12 12v24z" class=""></path></svg> <span class="visually-hidden">Focus to learn more</span> </button>  <div role="tooltip" id="more-info-desc-1"> <span class="left-corner"></span> arXiv-issued DOI via DataCite</div> </div> </td> </tr></table> </div> </div> </div> <div class="submission-history"> <h2>Submission history</h2> From: Dasom Kim [<a href="/show-email/ecf61020/2401.01873" rel="nofollow">view email</a>] <br/> <strong>[v1]</strong> Wed, 3 Jan 2024 18:31:50 UTC (3,266 KB)<br/> </div> </div>  <div class="extra-services"> <div class="full-text"> <a name="other"></a> <span class="descriptor">Full-text links:</span> <h2>Access Paper:</h2> <ul> <div id="download-button-info" hidden> View a PDF of the paper titled Observation of the Magnonic Dicke Superradiant Phase Transition, by Dasom Kim and 18 other authors</div><li><a href="/pdf/2401.01873" aria-describedby="download-button-info" accesskey="f" class="abs-button download-pdf">View PDF</a></li><li><a href="https://arxiv.org/html/2401.01873v1" class="abs-button" id="latexml-download-link">HTML (experimental)</a></li><li><a href="/src/2401.01873" class="abs-button download-eprint">TeX Source</a></li><li><a href="/format/2401.01873" class="abs-button download-format">Other Formats</a></li></ul> <div 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[2401.01873] Observation of the Magnonic Dicke Superradiant Phase Transition