Incipient nematicity from electron flat bands in a kagome metal
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866913215879839744 |
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| author | Drucker, Nathan Nguyen, Thanh Mandal, Manasi Siriviboon, Phum Quan, Yujie Boonkird, Artittaya Okabe, Ryotaro Li, Fankang Buragge, Kaleb Funuma, Fumiaki Matsuda, Masaaki Abernathy, Douglas Williams, Travis Chi, Songxue Ye, Feng Nelson, Christie Liao, Bolin Volkov, Pavel Li, Mingda |
| author_facet | Drucker, Nathan Nguyen, Thanh Mandal, Manasi Siriviboon, Phum Quan, Yujie Boonkird, Artittaya Okabe, Ryotaro Li, Fankang Buragge, Kaleb Funuma, Fumiaki Matsuda, Masaaki Abernathy, Douglas Williams, Travis Chi, Songxue Ye, Feng Nelson, Christie Liao, Bolin Volkov, Pavel Li, Mingda |
| contents | Engineering new quantum phases requires fine tuning of the electronic, orbital, spin, and lattice degrees of freedom. To this end, the kagome lattice with flat bands has garnered great attention by hosting various topological and correlated phases, when the flat band is at the Fermi level. Here we discover unconventional nematiciy in kagome metal CoSn, where flat bands are fully occupied below the Fermi level. Thermodynamic, dilatometry, resonant X-ray scattering, inelastic neutron scattering, Larmor diffraction, and thermoelectric measurements consistently hint at rotational symmetry-breaking and nematic order that is pronounced only near T=225 K. These observations, principally the nematic's finite temperature stability -- incipience -- can be explained by a phenomenological model which reveals that thermally excited flat bands promote symmetry breaking at a characteristic temperature. Our work shows that thermal fluctuations, which are typically detrimental for correlated electron phases, can induce new ordered states of matter, avoiding the requirements for fine tuning of electronic bands. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_17141 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Incipient nematicity from electron flat bands in a kagome metal Drucker, Nathan Nguyen, Thanh Mandal, Manasi Siriviboon, Phum Quan, Yujie Boonkird, Artittaya Okabe, Ryotaro Li, Fankang Buragge, Kaleb Funuma, Fumiaki Matsuda, Masaaki Abernathy, Douglas Williams, Travis Chi, Songxue Ye, Feng Nelson, Christie Liao, Bolin Volkov, Pavel Li, Mingda Strongly Correlated Electrons Engineering new quantum phases requires fine tuning of the electronic, orbital, spin, and lattice degrees of freedom. To this end, the kagome lattice with flat bands has garnered great attention by hosting various topological and correlated phases, when the flat band is at the Fermi level. Here we discover unconventional nematiciy in kagome metal CoSn, where flat bands are fully occupied below the Fermi level. Thermodynamic, dilatometry, resonant X-ray scattering, inelastic neutron scattering, Larmor diffraction, and thermoelectric measurements consistently hint at rotational symmetry-breaking and nematic order that is pronounced only near T=225 K. These observations, principally the nematic's finite temperature stability -- incipience -- can be explained by a phenomenological model which reveals that thermally excited flat bands promote symmetry breaking at a characteristic temperature. Our work shows that thermal fluctuations, which are typically detrimental for correlated electron phases, can induce new ordered states of matter, avoiding the requirements for fine tuning of electronic bands. |
| title | Incipient nematicity from electron flat bands in a kagome metal |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2401.17141 |