Electrically tunable heavy fermion and quantum criticality in magic-angle twisted trilayer graphene
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arXiv
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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866911060626243584 |
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| author | Zhang, Le Zhou, Wenqiang Fang, Xinjie Zhan, Zhen Watanabe, Kenji Taniguchi, Takashi Yang, Yi-feng Xu, Shuigang |
| author_facet | Zhang, Le Zhou, Wenqiang Fang, Xinjie Zhan, Zhen Watanabe, Kenji Taniguchi, Takashi Yang, Yi-feng Xu, Shuigang |
| contents | The interplay between localized magnetic moments and itinerant electrons gives rise to exotic quantum states in condensed matter systems. Two-dimensional moire superlattices offer a powerful platform for engineering heavy fermion states beyond conventional rare-earth intermetallic compounds. While localized and itinerant carriers have been observed in twisted graphene moire systems, direct evidence of their strong coupling--leading to artificial heavy fermion states--has remained elusive. Here, we demonstrate electrically tunable heavy fermion in magic-angle twisted trilayer graphene, achieved by controlling the Kondo hybridization between localized flatband electrons and itinerant Dirac electrons via a displacement field. Our results reveal a continuous quantum phase transition from an antiferromagnetic semimetal to a paramagnetic heavy fermion metal, evidenced by a crossover from logarithmic to quadratic temperature-dependent resistivity, a dramatic enhancement of quasiparticle effective mass, and Fermi surface reconstruction near quantum critical point. This highly tunable platform offers unprecedented control over heavy fermion physics, establishing moire heterostructures as a versatile arena for exploring correlated quantum phases--including potential unconventional superconductivity--in two-dimensional materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_12254 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Electrically tunable heavy fermion and quantum criticality in magic-angle twisted trilayer graphene Zhang, Le Zhou, Wenqiang Fang, Xinjie Zhan, Zhen Watanabe, Kenji Taniguchi, Takashi Yang, Yi-feng Xu, Shuigang Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons The interplay between localized magnetic moments and itinerant electrons gives rise to exotic quantum states in condensed matter systems. Two-dimensional moire superlattices offer a powerful platform for engineering heavy fermion states beyond conventional rare-earth intermetallic compounds. While localized and itinerant carriers have been observed in twisted graphene moire systems, direct evidence of their strong coupling--leading to artificial heavy fermion states--has remained elusive. Here, we demonstrate electrically tunable heavy fermion in magic-angle twisted trilayer graphene, achieved by controlling the Kondo hybridization between localized flatband electrons and itinerant Dirac electrons via a displacement field. Our results reveal a continuous quantum phase transition from an antiferromagnetic semimetal to a paramagnetic heavy fermion metal, evidenced by a crossover from logarithmic to quadratic temperature-dependent resistivity, a dramatic enhancement of quasiparticle effective mass, and Fermi surface reconstruction near quantum critical point. This highly tunable platform offers unprecedented control over heavy fermion physics, establishing moire heterostructures as a versatile arena for exploring correlated quantum phases--including potential unconventional superconductivity--in two-dimensional materials. |
| title | Electrically tunable heavy fermion and quantum criticality in magic-angle twisted trilayer graphene |
| topic | Mesoscale and Nanoscale Physics Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2507.12254 |