Visualization of intervalley coherent phase in PtSe2/HOPG heterojunction
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arXiv
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866911320853446656 |
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| author | Fan, Kai Li, Bohao Qiu, Wen-Xuan Guo, Ting-Fei Zhou, Jian-Wang Xie, Tao Zhang, Wen-Hao Liu, Chao-Fei Wu, Fengcheng Fu, Ying-Shuang |
| author_facet | Fan, Kai Li, Bohao Qiu, Wen-Xuan Guo, Ting-Fei Zhou, Jian-Wang Xie, Tao Zhang, Wen-Hao Liu, Chao-Fei Wu, Fengcheng Fu, Ying-Shuang |
| contents | Intervalley coherent (IVC) phase in graphene systems arises from the coherent superposition of wave functions of opposite valleys, whose direct microscopic visualization provides pivotal insight into the emergent physics but remains elusive. Here, we successfully visualize the IVC phase in a heterostructure of monolayer PtSe2 on highly oriented pyrolytic graphite. Using spectroscopic imaging scanning tunneling microscopy, we observe a Root3 by Root3 modulation pattern superimposed on the higher-order moire superlattice of the heterostructure, which correlates with a small gap opening around the Fermi level and displays an anti-phase real-space conductance distribution of the two gap edges. Such modulation pattern and small-gap vanish on the heterostructure of monolayer PtSe2 on bilayer-graphene-covered SiC substrate, due to the increased carrier density in the bilayer graphene. We provide a theoretical mechanism that the Root3 by Root3 modulation pattern originates from the IVC phase of few-layer graphene, which is magnified by the higher-order moire superlattice. Our work achieves visualization of the IVC phase, and develops an avenue for its generation and amplification via a moiré interface. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_01622 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Visualization of intervalley coherent phase in PtSe2/HOPG heterojunction Fan, Kai Li, Bohao Qiu, Wen-Xuan Guo, Ting-Fei Zhou, Jian-Wang Xie, Tao Zhang, Wen-Hao Liu, Chao-Fei Wu, Fengcheng Fu, Ying-Shuang Mesoscale and Nanoscale Physics Strongly Correlated Electrons Intervalley coherent (IVC) phase in graphene systems arises from the coherent superposition of wave functions of opposite valleys, whose direct microscopic visualization provides pivotal insight into the emergent physics but remains elusive. Here, we successfully visualize the IVC phase in a heterostructure of monolayer PtSe2 on highly oriented pyrolytic graphite. Using spectroscopic imaging scanning tunneling microscopy, we observe a Root3 by Root3 modulation pattern superimposed on the higher-order moire superlattice of the heterostructure, which correlates with a small gap opening around the Fermi level and displays an anti-phase real-space conductance distribution of the two gap edges. Such modulation pattern and small-gap vanish on the heterostructure of monolayer PtSe2 on bilayer-graphene-covered SiC substrate, due to the increased carrier density in the bilayer graphene. We provide a theoretical mechanism that the Root3 by Root3 modulation pattern originates from the IVC phase of few-layer graphene, which is magnified by the higher-order moire superlattice. Our work achieves visualization of the IVC phase, and develops an avenue for its generation and amplification via a moiré interface. |
| title | Visualization of intervalley coherent phase in PtSe2/HOPG heterojunction |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2501.01622 |