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Increasing band degeneracy can effectively balance  and  to achieve a high\u2010power factor (PF, ), yet highly degenerate electronic structures are uncommon, particularly in low\u2010symmetry materials. In this work, we propose an unconventional strategy to enhance band degeneracy in zig\u2010zag\u2010chain  ( P, As, Sb, and Bi) compounds. Strong intra\u2010chain hybridization between  and  orbitals, together with unexpectedly strong inter\u2010chain coupling of  states, generates a highly dispersive multivalley valence band that supports large PF. Concurrently, the quasi\u2010one\u2010dimensional framework's inherently weak inter\u2010chain interactions, together with the softened Au\u2013 and Au\u2013Au bonds within the chains due to the antibonding \u2013 states, lead to a substantial reduction in . First\u2010principles calculations, integrated with Boltzmann transport theory, confirm that these unique structural and electronic attributes enable \u2010type  to exhibit high thermoelectric performance. This work establishes a new design paradigm for high\u2010efficiency thermoelectric materials by harnessing substantial orbital overlap within weakly bonded, quasi\u2010one\u2010dimensional systems. The findings open promising avenues for discovering and engineering high\u2010performance thermoelectric\u00a0materials.<\/jats:p>","DOI":"10.1002\/smll.73376","type":"journal-article","created":{"date-parts":[[2026,4,20]],"date-time":"2026-04-20T10:17:20Z","timestamp":1776680240000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Strong Intra\u2010 and Interchain Orbital Coupling Leads To Multiband and High Thermoelectric Performance In Na\n                    <sub>2<\/sub>\n                    Au\n                    <i>X<\/i>\n                    (\n                    <i>X<\/i>\n                    = P, As, Sb, and Bi)"],"prefix":"10.1002","volume":"22","author":[{"given":"Zhonghao","family":"Xia","sequence":"first","affiliation":[{"name":"Key Laboratory of Advanced Materials and Devices for Post\u2010Moore Chips Ministry of Education School of Mathematics and Physics University of Science and Technology Beijing Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhilong","family":"Yang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Advanced Materials and Devices for Post\u2010Moore Chips Ministry of Education School of Mathematics and Physics University of Science and Technology Beijing Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yali","family":"Yang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Advanced Materials and Devices for Post\u2010Moore Chips Ministry of Education School of Mathematics and Physics University of Science and Technology Beijing Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kaile","family":"Ren","sequence":"additional","affiliation":[{"name":"Key Laboratory of Advanced Materials and Devices for Post\u2010Moore Chips Ministry of Education School of Mathematics and Physics University of Science and Technology Beijing Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9643-3617","authenticated-orcid":false,"given":"Jiangang","family":"He","sequence":"additional","affiliation":[{"name":"Key Laboratory of Advanced Materials and Devices for Post\u2010Moore Chips Ministry of Education School of Mathematics and Physics University of Science and Technology Beijing Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,4,20]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1039\/D4TA08215J"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202418244"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jmst.2021.12.069"},{"key":"e_1_2_8_5_1","volume-title":"Solid State Physics","author":"Ashcroft N. 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