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Recent studies demonstrate that orbital currents can be generated from charge currents through the orbital Hall effect in ferromagnetic materials. However, the generation of orbital currents in antiferromagnets has so far been elusive. In this work, this is experimentally observed that the generation of orbital currents from orbital dynamics in the antiferromagnetic insulator\n                    <jats:italic>\u03b1<\/jats:italic>\n                    \u2010Fe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    via terahertz (THz) emission spectroscopy, a phenomenon known as orbital pumping. A significant increase in THz signal is obtained in\n                    <jats:italic>\u03b1<\/jats:italic>\n                    \u2010Fe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    \/Pt\/CuO\n                    <jats:sub>x<\/jats:sub>\n                    heterostructure compared to that of\n                    <jats:italic>\u03b1<\/jats:italic>\n                    \u2010Fe\n                    <jats:sub>2<\/jats:sub>\n                    O\n                    <jats:sub>3<\/jats:sub>\n                    \/Pt, with the maximum value occurring at a Pt thickness of 2\u00a0nm. The enhancement of the THz signal is attributed to the fact that magnons injected into Pt excite a coupled spin\u2010orbital current that flows toward the Pt\/CuO\n                    <jats:sub>x<\/jats:sub>\n                    interface, aside from the spin\u2010to\u2010charge conversion in the Pt layer. The magnetoresistance contains the conventional spin\u2010Hall magnetoresistance contributed by the Pt layer and an additional orbital contribution from the Pt\/CuO\n                    <jats:sub>x<\/jats:sub>\n                    interface. The Pt\/CuO\n                    <jats:sub>x<\/jats:sub>\n                    interface generates an orbital current and absorbs the orbital accumulation, similar to the orbital\u2010Hall magnetoresistance. This finding provides a rich platform for orbital\u2010to\u2010charge conversion and opens an interdisciplinary field of antiferromagnetic orbitronics.\n                  <\/jats:p>","DOI":"10.1002\/adma.202402063","type":"journal-article","created":{"date-parts":[[2024,12,21]],"date-time":"2024-12-21T01:23:27Z","timestamp":1734744207000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Orbital Current Pumping From Ultrafast Light\u2010driven Antiferromagnetic Insulator"],"prefix":"10.1002","volume":"37","author":[{"given":"Lin","family":"Huang","sequence":"first","affiliation":[{"name":"Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University  Beijing 100084 China"},{"name":"Anhui Provincial Key Laboratory of Magnetic Functional Materials and Devices School of Materials Science and Engineering Anhui University  Hefei Anhui 230601 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Da","family":"Tian","sequence":"additional","affiliation":[{"name":"Research Institute of Superconductor Electronics (RISE) School of Electronic Science and Engineering Nanjing University  Nanjing 210023 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liyang","family":"Liao","sequence":"additional","affiliation":[{"name":"Institute for Solid State Physics University of Tokyo  Kashiwa 277\u20108581 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongsong","family":"Qiu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Spintronics Devices and Technologies School of Integrated Circuits Nanjing University  Suzhou 210033 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hua","family":"Bai","sequence":"additional","affiliation":[{"name":"Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University  Beijing 100084 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qian","family":"Wang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University  Beijing 100084 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Feng","family":"Pan","sequence":"additional","affiliation":[{"name":"Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University  Beijing 100084 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Caihong","family":"Zhang","sequence":"additional","affiliation":[{"name":"Research Institute of Superconductor Electronics (RISE) School of Electronic Science and Engineering Nanjing University  Nanjing 210023 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Biaobing","family":"Jin","sequence":"additional","affiliation":[{"name":"Research Institute of Superconductor Electronics (RISE) School of Electronic Science and Engineering Nanjing University  Nanjing 210023 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7651-9031","authenticated-orcid":false,"given":"Cheng","family":"Song","sequence":"additional","affiliation":[{"name":"Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University  Beijing 100084 China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,12,20]]},"reference":[{"key":"e_1_2_8_1_1","doi-asserted-by":"publisher","DOI":"10.1103\/RevModPhys.91.035004"},{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1103\/RevModPhys.87.1213"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature19820"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201907148"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.102.016601"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.121.086602"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.98.214405"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevResearch.2.013177"},{"key":"e_1_2_8_9_1","doi-asserted-by":"crossref","DOI":"10.1103\/PhysRevB.103.L020407","volume":"103","author":"Kim J.","year":"2021","journal-title":"Phys. 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