Revealing the Charge Density Wave Proximity Effect in Graphene on 1T-TaS$_2$
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866912046783660032 |
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| author | Tilak, Nikhil Altvater, Michael Hung, Sheng-Hsiung Won, Choong-Jae Li, Guohong Kaleem, Taha Cheong, Sang-Wook Chung, Chung-Hou Jeng, Horng-Tay Andrei, Eva Y. |
| author_facet | Tilak, Nikhil Altvater, Michael Hung, Sheng-Hsiung Won, Choong-Jae Li, Guohong Kaleem, Taha Cheong, Sang-Wook Chung, Chung-Hou Jeng, Horng-Tay Andrei, Eva Y. |
| contents | The proximity-effect, whereby materials in contact appropriate each others electronic-properties, is widely used to induce correlated states, such as superconductivity or magnetism, at heterostructure interfaces. Thus far however, demonstrating the existence of proximity-induced charge-density-waves (PI-CDW) proved challenging. This is due to competing effects, such as screening or co-tunneling into the parent material, that obscured its presence. Here we report the observation of a PI-CDW in a graphene layer contacted by a 1T-TaS2 substrate. Using scanning tunneling microscopy (STM) and spectroscopy (STS) together with theoretical-modeling, we show that the coexistence of a CDW with a Mott gap in 1T-TaS2 coupled with the Dirac-dispersion of electrons in graphene, makes it possible to unambiguously demonstrate the PI-CDW by ruling out alternative interpretations. Furthermore, we find that the PI-CDW is accompanied by a reduction of the Mott gap in 1T-TaS2 and show that the mechanism underlying the PI-CDW is well-described by short-range exchange-interactions that are distinctly different from previously observed proximity effects. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_10606 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Revealing the Charge Density Wave Proximity Effect in Graphene on 1T-TaS$_2$ Tilak, Nikhil Altvater, Michael Hung, Sheng-Hsiung Won, Choong-Jae Li, Guohong Kaleem, Taha Cheong, Sang-Wook Chung, Chung-Hou Jeng, Horng-Tay Andrei, Eva Y. Mesoscale and Nanoscale Physics The proximity-effect, whereby materials in contact appropriate each others electronic-properties, is widely used to induce correlated states, such as superconductivity or magnetism, at heterostructure interfaces. Thus far however, demonstrating the existence of proximity-induced charge-density-waves (PI-CDW) proved challenging. This is due to competing effects, such as screening or co-tunneling into the parent material, that obscured its presence. Here we report the observation of a PI-CDW in a graphene layer contacted by a 1T-TaS2 substrate. Using scanning tunneling microscopy (STM) and spectroscopy (STS) together with theoretical-modeling, we show that the coexistence of a CDW with a Mott gap in 1T-TaS2 coupled with the Dirac-dispersion of electrons in graphene, makes it possible to unambiguously demonstrate the PI-CDW by ruling out alternative interpretations. Furthermore, we find that the PI-CDW is accompanied by a reduction of the Mott gap in 1T-TaS2 and show that the mechanism underlying the PI-CDW is well-described by short-range exchange-interactions that are distinctly different from previously observed proximity effects. |
| title | Revealing the Charge Density Wave Proximity Effect in Graphene on 1T-TaS$_2$ |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2311.10606 |