Surface Charge Induced Dirac Band Splitting in a Charge Density Wave Material (TaSe4)2I
(TaSe4)2I, a quasi-one-dimensional (1D) crystal, shows a characteristic temperature-driven metal-insulator phase transition. Above the charge density wave (CDW) temperature Tc, (TaSe4)2I has been predicted to harbor a Weyl semimetal phase. Below Tc, it becomes an axion insulator. Here, we performed...
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| creator | Hemian Yi Huang, Zengle Shi, Wujun Lujin Min Wu, Rui Polley, C M Zhang, Ruoxi Yi-Fan, Zhao Ling-Jie, Zhou Adell, J Gui, Xin Xie, Weiwei Chan, Moses H W Mao, Zhiqiang Wang, Zhijun Wu, Weida Cui-Zu, Chang |
| description | (TaSe4)2I, a quasi-one-dimensional (1D) crystal, shows a characteristic temperature-driven metal-insulator phase transition. Above the charge density wave (CDW) temperature Tc, (TaSe4)2I has been predicted to harbor a Weyl semimetal phase. Below Tc, it becomes an axion insulator. Here, we performed angle-resolved photoemission spectroscopy (ARPES) measurements on the (110) surface of (TaSe4)2I and observed two sets of Dirac-like energy bands in the first Brillion zone, which agree well with our first-principles calculations. Moreover, we found that each Dirac band exhibits an energy splitting of hundreds of meV under certain circumstances. In combination with core level measurements, our theoretical analysis showed that this Dirac band splitting is a result of surface charge polarization due to the loss of surface iodine atoms. Our findings here shed new light on the interplay between band topology and CDW order in Peierls compounds and will motivate more studies on topological properties of strongly correlated quasi-1D materials. |
| doi_str_mv | 10.48550/arxiv.2012.02402 |
| format | Article |
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Above the charge density wave (CDW) temperature Tc, (TaSe4)2I has been predicted to harbor a Weyl semimetal phase. Below Tc, it becomes an axion insulator. Here, we performed angle-resolved photoemission spectroscopy (ARPES) measurements on the (110) surface of (TaSe4)2I and observed two sets of Dirac-like energy bands in the first Brillion zone, which agree well with our first-principles calculations. Moreover, we found that each Dirac band exhibits an energy splitting of hundreds of meV under certain circumstances. In combination with core level measurements, our theoretical analysis showed that this Dirac band splitting is a result of surface charge polarization due to the loss of surface iodine atoms. Our findings here shed new light on the interplay between band topology and CDW order in Peierls compounds and will motivate more studies on topological properties of strongly correlated quasi-1D materials.</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.2012.02402</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Charge density waves ; Charge materials ; Energy bands ; First principles ; Insulators ; Iodine ; Phase transitions ; Photoelectric emission ; Physics - Materials Science ; Physics - Mesoscale and Nanoscale Physics ; Physics - Strongly Correlated Electrons ; Splitting ; Surface charge ; Topology</subject><ispartof>arXiv.org, 2020-12</ispartof><rights>2020. This work is published under http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (the “License”). 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Above the charge density wave (CDW) temperature Tc, (TaSe4)2I has been predicted to harbor a Weyl semimetal phase. Below Tc, it becomes an axion insulator. Here, we performed angle-resolved photoemission spectroscopy (ARPES) measurements on the (110) surface of (TaSe4)2I and observed two sets of Dirac-like energy bands in the first Brillion zone, which agree well with our first-principles calculations. Moreover, we found that each Dirac band exhibits an energy splitting of hundreds of meV under certain circumstances. In combination with core level measurements, our theoretical analysis showed that this Dirac band splitting is a result of surface charge polarization due to the loss of surface iodine atoms. Our findings here shed new light on the interplay between band topology and CDW order in Peierls compounds and will motivate more studies on topological properties of strongly correlated quasi-1D materials.</description><subject>Charge density waves</subject><subject>Charge materials</subject><subject>Energy bands</subject><subject>First principles</subject><subject>Insulators</subject><subject>Iodine</subject><subject>Phase transitions</subject><subject>Photoelectric emission</subject><subject>Physics - Materials Science</subject><subject>Physics - Mesoscale and Nanoscale Physics</subject><subject>Physics - Strongly Correlated Electrons</subject><subject>Splitting</subject><subject>Surface charge</subject><subject>Topology</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><sourceid>GOX</sourceid><recordid>eNo1j81OwkAURicmJhLkAVw5iRtdtF7uzLQzSwV_SDAuIGHZXJhbHIIFpy2RtxdBV9_m5Ms5Qlz1IdXWGLin-B12KUIfU0ANeCY6qFQ_sRrxQvTqegUAmOVojOqI2aSNJS1YDj4oLlmOKt8u2MthiLSQj1R5OdmuQ9OEailDJekfHHJVh2YvZ7Rj-UYNx0BreTulCes7HF2K85LWNff-tiumz0_TwWsyfn8ZDR7GCRk0ibKkyzInw5B5peaZI1cyKXAGvAViz8YiWetdBqUjyrXVaq6MdXPr2KquuD7dHquLbQyfFPfFb31xrD8QNydiGzdfLddNsdq0sTo4FaizPAertVE_X1Fauw</recordid><startdate>20201213</startdate><enddate>20201213</enddate><creator>Hemian Yi</creator><creator>Huang, Zengle</creator><creator>Shi, Wujun</creator><creator>Lujin Min</creator><creator>Wu, Rui</creator><creator>Polley, C M</creator><creator>Zhang, Ruoxi</creator><creator>Yi-Fan, Zhao</creator><creator>Ling-Jie, Zhou</creator><creator>Adell, J</creator><creator>Gui, Xin</creator><creator>Xie, Weiwei</creator><creator>Chan, Moses H W</creator><creator>Mao, Zhiqiang</creator><creator>Wang, Zhijun</creator><creator>Wu, Weida</creator><creator>Cui-Zu, Chang</creator><general>Cornell University Library, arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PHGZM</scope><scope>PHGZT</scope><scope>PIMPY</scope><scope>PKEHL</scope><scope>PQEST</scope><scope>PQGLB</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>GOX</scope></search><sort><creationdate>20201213</creationdate><title>Surface Charge Induced Dirac Band Splitting in a Charge Density Wave Material (TaSe4)2I</title><author>Hemian Yi ; Huang, Zengle ; Shi, Wujun ; Lujin Min ; Wu, Rui ; Polley, C M ; Zhang, Ruoxi ; Yi-Fan, Zhao ; Ling-Jie, Zhou ; Adell, J ; Gui, Xin ; Xie, Weiwei ; Chan, Moses H W ; Mao, Zhiqiang ; Wang, Zhijun ; Wu, Weida ; Cui-Zu, Chang</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a525-38a4ff7a5e06d33b69a9fea30950d80aede582a88d960f9aa74843b3589b89e83</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Charge density waves</topic><topic>Charge materials</topic><topic>Energy bands</topic><topic>First principles</topic><topic>Insulators</topic><topic>Iodine</topic><topic>Phase transitions</topic><topic>Photoelectric emission</topic><topic>Physics - Materials Science</topic><topic>Physics - Mesoscale and Nanoscale Physics</topic><topic>Physics - Strongly Correlated Electrons</topic><topic>Splitting</topic><topic>Surface charge</topic><topic>Topology</topic><toplevel>online_resources</toplevel><creatorcontrib>Hemian Yi</creatorcontrib><creatorcontrib>Huang, Zengle</creatorcontrib><creatorcontrib>Shi, Wujun</creatorcontrib><creatorcontrib>Lujin Min</creatorcontrib><creatorcontrib>Wu, Rui</creatorcontrib><creatorcontrib>Polley, C M</creatorcontrib><creatorcontrib>Zhang, Ruoxi</creatorcontrib><creatorcontrib>Yi-Fan, Zhao</creatorcontrib><creatorcontrib>Ling-Jie, Zhou</creatorcontrib><creatorcontrib>Adell, J</creatorcontrib><creatorcontrib>Gui, Xin</creatorcontrib><creatorcontrib>Xie, Weiwei</creatorcontrib><creatorcontrib>Chan, Moses H W</creatorcontrib><creatorcontrib>Mao, Zhiqiang</creatorcontrib><creatorcontrib>Wang, Zhijun</creatorcontrib><creatorcontrib>Wu, Weida</creatorcontrib><creatorcontrib>Cui-Zu, Chang</creatorcontrib><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>ProQuest Central (New)</collection><collection>ProQuest One Academic (New)</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Middle East (New)</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Applied & Life Sciences</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection><collection>arXiv.org</collection><jtitle>arXiv.org</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Hemian Yi</au><au>Huang, Zengle</au><au>Shi, Wujun</au><au>Lujin Min</au><au>Wu, Rui</au><au>Polley, C M</au><au>Zhang, Ruoxi</au><au>Yi-Fan, Zhao</au><au>Ling-Jie, Zhou</au><au>Adell, J</au><au>Gui, Xin</au><au>Xie, Weiwei</au><au>Chan, Moses H W</au><au>Mao, Zhiqiang</au><au>Wang, Zhijun</au><au>Wu, Weida</au><au>Cui-Zu, Chang</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Surface Charge Induced Dirac Band Splitting in a Charge Density Wave Material (TaSe4)2I</atitle><jtitle>arXiv.org</jtitle><date>2020-12-13</date><risdate>2020</risdate><eissn>2331-8422</eissn><abstract>(TaSe4)2I, a quasi-one-dimensional (1D) crystal, shows a characteristic temperature-driven metal-insulator phase transition. Above the charge density wave (CDW) temperature Tc, (TaSe4)2I has been predicted to harbor a Weyl semimetal phase. Below Tc, it becomes an axion insulator. Here, we performed angle-resolved photoemission spectroscopy (ARPES) measurements on the (110) surface of (TaSe4)2I and observed two sets of Dirac-like energy bands in the first Brillion zone, which agree well with our first-principles calculations. Moreover, we found that each Dirac band exhibits an energy splitting of hundreds of meV under certain circumstances. In combination with core level measurements, our theoretical analysis showed that this Dirac band splitting is a result of surface charge polarization due to the loss of surface iodine atoms. Our findings here shed new light on the interplay between band topology and CDW order in Peierls compounds and will motivate more studies on topological properties of strongly correlated quasi-1D materials.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.2012.02402</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Charge density waves Charge materials Energy bands First principles Insulators Iodine Phase transitions Photoelectric emission Physics - Materials Science Physics - Mesoscale and Nanoscale Physics Physics - Strongly Correlated Electrons Splitting Surface charge Topology |
| title | Surface Charge Induced Dirac Band Splitting in a Charge Density Wave Material (TaSe4)2I |
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