Enhanced superconductivity upon weakening of charge density wave transport in 2H-TaS₂ in the two-dimensional limit
Layered transition-metal dichalcogenides that host coexisting charge-density wave (CDW) and superconducting orders provide ideal systems for exploring the effects of dimensionality on correlated electronic phases. Dimensionality has a profound effect on both superconductivity and CDW instabilities....
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2018
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| Online Access: | http://hdl.handle.net/1721.1/117091 https://orcid.org/0000-0003-1017-0233 https://orcid.org/0000-0003-3648-7706 https://orcid.org/0000-0001-8217-8213 |
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| author | Fang, Shiang Navarro-Moratalla, Efrén Watanabe, Kenji Taniguchi, Takashi Kaxiras, Efthimios Yang, Yafang Fatemi, Valla Ruhman, Yehonatan Jarillo-Herrero, Pablo |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Fang, Shiang Navarro-Moratalla, Efrén Watanabe, Kenji Taniguchi, Takashi Kaxiras, Efthimios Yang, Yafang Fatemi, Valla Ruhman, Yehonatan Jarillo-Herrero, Pablo |
| author_sort | Fang, Shiang |
| collection | MIT |
| description | Layered transition-metal dichalcogenides that host coexisting charge-density wave (CDW) and superconducting orders provide ideal systems for exploring the effects of dimensionality on correlated electronic phases. Dimensionality has a profound effect on both superconductivity and CDW instabilities. Here we report a substantial enhancement of the superconducting T[subscript c] to 3.4 K for 2H-TaS₂ in the monolayer limit, compared to 0.8 K in the bulk. In addition, the transport signature of a CDW phase transition vanishes in the two-dimensional limit. In our analysis of electronic and vibrational properties of this material, we show that a reduction of the CDW amplitude results in a substantial increase of the density of states at the Fermi energy, which can boost T[subscript c] by an amount similar to that seen in experiment. Our results indicate competition between CDW order and superconductivity in ultrathin 2H-TaS₂ down to the monolayer limit, providing insight toward understanding correlated electronic phases in reduced dimensions. |
| first_indexed | 2024-09-23T09:05:53Z |
| format | Article |
| id | mit-1721.1/117091 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T09:05:53Z |
| publishDate | 2018 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/1170912022-09-26T10:26:21Z Enhanced superconductivity upon weakening of charge density wave transport in 2H-TaS₂ in the two-dimensional limit Fang, Shiang Navarro-Moratalla, Efrén Watanabe, Kenji Taniguchi, Takashi Kaxiras, Efthimios Yang, Yafang Fatemi, Valla Ruhman, Yehonatan Jarillo-Herrero, Pablo Massachusetts Institute of Technology. Department of Physics Yang, Yafang Fatemi, Valla Ruhman, Yehonatan Jarillo-Herrero, Pablo Layered transition-metal dichalcogenides that host coexisting charge-density wave (CDW) and superconducting orders provide ideal systems for exploring the effects of dimensionality on correlated electronic phases. Dimensionality has a profound effect on both superconductivity and CDW instabilities. Here we report a substantial enhancement of the superconducting T[subscript c] to 3.4 K for 2H-TaS₂ in the monolayer limit, compared to 0.8 K in the bulk. In addition, the transport signature of a CDW phase transition vanishes in the two-dimensional limit. In our analysis of electronic and vibrational properties of this material, we show that a reduction of the CDW amplitude results in a substantial increase of the density of states at the Fermi energy, which can boost T[subscript c] by an amount similar to that seen in experiment. Our results indicate competition between CDW order and superconductivity in ultrathin 2H-TaS₂ down to the monolayer limit, providing insight toward understanding correlated electronic phases in reduced dimensions. United States. Department of Energy. Office of Basic Energy Sciences (Award DE-SC0001819) Gordon and Betty Moore Foundation (Grant GBMF4541) National Science Foundation (U.S.) (Award DMR-1231319) 2018-07-24T18:17:11Z 2018-07-24T18:17:11Z 2018-07 2018-06 2018-07-20T18:00:19Z Article http://purl.org/eprint/type/JournalArticle 2469-9950 2469-9969 http://hdl.handle.net/1721.1/117091 Yang, Yafang et al. "Enhanced superconductivity upon weakening of charge density wave transport in 2H-TaS₂ in the two-dimensional limit." Physical Review B 98, 3 (July 2018): 035203 © 2018 American Physical Society https://orcid.org/0000-0003-1017-0233 https://orcid.org/0000-0003-3648-7706 https://orcid.org/0000-0001-8217-8213 en http://dx.doi.org/10.1103/PhysRevB.98.035203 Physical Review B Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. American Physical Society application/pdf American Physical Society American Physical Society |
| spellingShingle | Fang, Shiang Navarro-Moratalla, Efrén Watanabe, Kenji Taniguchi, Takashi Kaxiras, Efthimios Yang, Yafang Fatemi, Valla Ruhman, Yehonatan Jarillo-Herrero, Pablo Enhanced superconductivity upon weakening of charge density wave transport in 2H-TaS₂ in the two-dimensional limit |
| title | Enhanced superconductivity upon weakening of charge density wave transport in 2H-TaS₂ in the two-dimensional limit |
| title_full | Enhanced superconductivity upon weakening of charge density wave transport in 2H-TaS₂ in the two-dimensional limit |
| title_fullStr | Enhanced superconductivity upon weakening of charge density wave transport in 2H-TaS₂ in the two-dimensional limit |
| title_full_unstemmed | Enhanced superconductivity upon weakening of charge density wave transport in 2H-TaS₂ in the two-dimensional limit |
| title_short | Enhanced superconductivity upon weakening of charge density wave transport in 2H-TaS₂ in the two-dimensional limit |
| title_sort | enhanced superconductivity upon weakening of charge density wave transport in 2h tas₂ in the two dimensional limit |
| url | http://hdl.handle.net/1721.1/117091 https://orcid.org/0000-0003-1017-0233 https://orcid.org/0000-0003-3648-7706 https://orcid.org/0000-0001-8217-8213 |
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