Electronic correlations in twisted bilayer graphene near the magic angle
Twisted bilayer graphene with a twist angle of around 1.1° features a pair of isolated flat electronic bands and forms a platform for investigating strongly correlated electrons. Here, we use scanning tunnelling microscopy to probe the local properties of highly tunable twisted bilayer graphene devi...
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| Veröffentlicht in: | Nature physics 2019-11, Vol.15 (11), p.1174-1180 |
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| creator | Choi, Youngjoon Kemmer, Jeannette Peng, Yang Thomson, Alex Arora, Harpreet Polski, Robert Zhang, Yiran Ren, Hechen Alicea, Jason Refael, Gil von Oppen, Felix Watanabe, Kenji Taniguchi, Takashi Nadj-Perge, Stevan |
| description | Twisted bilayer graphene with a twist angle of around 1.1° features a pair of isolated flat electronic bands and forms a platform for investigating strongly correlated electrons. Here, we use scanning tunnelling microscopy to probe the local properties of highly tunable twisted bilayer graphene devices and show that the flat bands deform when aligned with the Fermi level. When the bands are half-filled, we observe the development of gaps originating from correlated insulating states. Near charge neutrality, we find a previously unidentified correlated regime featuring an enhanced splitting of the flat bands. We describe this within a microscopic model that predicts a strong tendency towards nematic ordering. Our results provide insights into symmetry-breaking correlation effects and highlight the importance of electronic interactions for all filling fractions in twisted bilayer graphene.
Scanning tunnelling microscopy shows that electrons in twisted bilayer graphene are strongly correlated for a wide range of density. In particular, a correlated regime appears near charge neutrality and theory suggests nematic ordering. |
| doi_str_mv | 10.1038/s41567-019-0606-5 |
| format | Article |
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Scanning tunnelling microscopy shows that electrons in twisted bilayer graphene are strongly correlated for a wide range of density. In particular, a correlated regime appears near charge neutrality and theory suggests nematic ordering.</description><identifier>ISSN: 1745-2473</identifier><identifier>EISSN: 1745-2481</identifier><identifier>DOI: 10.1038/s41567-019-0606-5</identifier><language>eng</language><publisher>London: Nature Publishing Group UK</publisher><subject>639/301/119/995 ; 639/925/918/1052 ; Atomic ; Bilayers ; Broken symmetry ; Classical and Continuum Physics ; Complex Systems ; Condensed Matter Physics ; Correlation ; Graphene ; Mathematical and Computational Physics ; Molecular ; Optical and Plasma Physics ; Physics ; Physics and Astronomy ; Theoretical</subject><ispartof>Nature physics, 2019-11, Vol.15 (11), p.1174-1180</ispartof><rights>The Author(s), under exclusive licence to Springer Nature Limited 2019</rights><rights>Copyright Nature Publishing Group Nov 2019</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c382t-502ebc26c4f3ef26f772522110c07902998b3edc445f0db36fd2ba94e28e91c93</citedby><cites>FETCH-LOGICAL-c382t-502ebc26c4f3ef26f772522110c07902998b3edc445f0db36fd2ba94e28e91c93</cites><orcidid>0000-0002-2394-9070 ; 0000-0003-3701-8119 ; 0000-0002-8477-0074</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1038/s41567-019-0606-5$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1038/s41567-019-0606-5$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,776,780,27901,27902,41464,42533,51294</link.rule.ids></links><search><creatorcontrib>Choi, Youngjoon</creatorcontrib><creatorcontrib>Kemmer, Jeannette</creatorcontrib><creatorcontrib>Peng, Yang</creatorcontrib><creatorcontrib>Thomson, Alex</creatorcontrib><creatorcontrib>Arora, Harpreet</creatorcontrib><creatorcontrib>Polski, Robert</creatorcontrib><creatorcontrib>Zhang, Yiran</creatorcontrib><creatorcontrib>Ren, Hechen</creatorcontrib><creatorcontrib>Alicea, Jason</creatorcontrib><creatorcontrib>Refael, Gil</creatorcontrib><creatorcontrib>von Oppen, Felix</creatorcontrib><creatorcontrib>Watanabe, Kenji</creatorcontrib><creatorcontrib>Taniguchi, Takashi</creatorcontrib><creatorcontrib>Nadj-Perge, Stevan</creatorcontrib><title>Electronic correlations in twisted bilayer graphene near the magic angle</title><title>Nature physics</title><addtitle>Nat. Phys</addtitle><description>Twisted bilayer graphene with a twist angle of around 1.1° features a pair of isolated flat electronic bands and forms a platform for investigating strongly correlated electrons. Here, we use scanning tunnelling microscopy to probe the local properties of highly tunable twisted bilayer graphene devices and show that the flat bands deform when aligned with the Fermi level. When the bands are half-filled, we observe the development of gaps originating from correlated insulating states. Near charge neutrality, we find a previously unidentified correlated regime featuring an enhanced splitting of the flat bands. We describe this within a microscopic model that predicts a strong tendency towards nematic ordering. Our results provide insights into symmetry-breaking correlation effects and highlight the importance of electronic interactions for all filling fractions in twisted bilayer graphene.
Scanning tunnelling microscopy shows that electrons in twisted bilayer graphene are strongly correlated for a wide range of density. In particular, a correlated regime appears near charge neutrality and theory suggests nematic ordering.</description><subject>639/301/119/995</subject><subject>639/925/918/1052</subject><subject>Atomic</subject><subject>Bilayers</subject><subject>Broken symmetry</subject><subject>Classical and Continuum Physics</subject><subject>Complex Systems</subject><subject>Condensed Matter Physics</subject><subject>Correlation</subject><subject>Graphene</subject><subject>Mathematical and Computational Physics</subject><subject>Molecular</subject><subject>Optical and Plasma Physics</subject><subject>Physics</subject><subject>Physics and Astronomy</subject><subject>Theoretical</subject><issn>1745-2473</issn><issn>1745-2481</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNp1kEFLwzAYhoMoOKc_wFvAczRfkqbNUcZ0wsCLnkOafu06unQmHbJ_b0eHnjx97-F93g8eQu6BPwKXxVNSkOmccTCMa65ZdkFmkKuMCVXA5W_O5TW5SWnLuRIa5Iyslh36Ifah9dT3MWLnhrYPibaBDt9tGrCiZdu5I0baRLffYEAa0EU6bJDuXDNyLjQd3pKr2nUJ7853Tj5flh-LFVu_v74tntfMy0IMLOMCSy-0V7XEWug6z0UmBAD3PDdcGFOUEiuvVFbzqpS6rkTpjEJRoAFv5Jw8TLv72H8dMA122x9iGF9aIQGM4srA2IKp5WOfUsTa7mO7c_FogduTMDsJs6MwexJms5ERE5PGbmgw_i3_D_0A6kNtbw</recordid><startdate>20191101</startdate><enddate>20191101</enddate><creator>Choi, Youngjoon</creator><creator>Kemmer, Jeannette</creator><creator>Peng, Yang</creator><creator>Thomson, Alex</creator><creator>Arora, Harpreet</creator><creator>Polski, Robert</creator><creator>Zhang, Yiran</creator><creator>Ren, Hechen</creator><creator>Alicea, Jason</creator><creator>Refael, Gil</creator><creator>von Oppen, Felix</creator><creator>Watanabe, Kenji</creator><creator>Taniguchi, Takashi</creator><creator>Nadj-Perge, Stevan</creator><general>Nature Publishing Group UK</general><general>Nature Publishing Group</general><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7U5</scope><scope>7XB</scope><scope>88I</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>GNUQQ</scope><scope>HCIFZ</scope><scope>L7M</scope><scope>M2P</scope><scope>P5Z</scope><scope>P62</scope><scope>PCBAR</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>Q9U</scope><orcidid>https://orcid.org/0000-0002-2394-9070</orcidid><orcidid>https://orcid.org/0000-0003-3701-8119</orcidid><orcidid>https://orcid.org/0000-0002-8477-0074</orcidid></search><sort><creationdate>20191101</creationdate><title>Electronic correlations in twisted bilayer graphene near the magic angle</title><author>Choi, Youngjoon ; 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Phys</stitle><date>2019-11-01</date><risdate>2019</risdate><volume>15</volume><issue>11</issue><spage>1174</spage><epage>1180</epage><pages>1174-1180</pages><issn>1745-2473</issn><eissn>1745-2481</eissn><abstract>Twisted bilayer graphene with a twist angle of around 1.1° features a pair of isolated flat electronic bands and forms a platform for investigating strongly correlated electrons. Here, we use scanning tunnelling microscopy to probe the local properties of highly tunable twisted bilayer graphene devices and show that the flat bands deform when aligned with the Fermi level. When the bands are half-filled, we observe the development of gaps originating from correlated insulating states. Near charge neutrality, we find a previously unidentified correlated regime featuring an enhanced splitting of the flat bands. We describe this within a microscopic model that predicts a strong tendency towards nematic ordering. Our results provide insights into symmetry-breaking correlation effects and highlight the importance of electronic interactions for all filling fractions in twisted bilayer graphene.
Scanning tunnelling microscopy shows that electrons in twisted bilayer graphene are strongly correlated for a wide range of density. In particular, a correlated regime appears near charge neutrality and theory suggests nematic ordering.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><doi>10.1038/s41567-019-0606-5</doi><tpages>7</tpages><orcidid>https://orcid.org/0000-0002-2394-9070</orcidid><orcidid>https://orcid.org/0000-0003-3701-8119</orcidid><orcidid>https://orcid.org/0000-0002-8477-0074</orcidid></addata></record> |
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| subjects | 639/301/119/995 639/925/918/1052 Atomic Bilayers Broken symmetry Classical and Continuum Physics Complex Systems Condensed Matter Physics Correlation Graphene Mathematical and Computational Physics Molecular Optical and Plasma Physics Physics Physics and Astronomy Theoretical |
| title | Electronic correlations in twisted bilayer graphene near the magic angle |
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