Excitonic instability of two-dimensional tilted Dirac cones
The electron-electron Coulomb interaction in Dirac-Weyl semimetals harbours a novel paradigm of correlation effects that hybridizes diverse realms of solid-state physics with their relativistic counterpart. Driving spontaneous mass acquisition, the excitonic condensate of strongly-interacting massle...
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| creator | Ohki, Daigo Hirata, Michihiro Tani, Takehiro Kanoda, Kazushi Kobayashi, Akito |
| description | The electron-electron Coulomb interaction in Dirac-Weyl semimetals harbours a novel paradigm of correlation effects that hybridizes diverse realms of solid-state physics with their relativistic counterpart. Driving spontaneous mass acquisition, the excitonic condensate of strongly-interacting massless Dirac fermions is one such example whose exact nature remains debated. Here, by focussing on the two-dimensional tilted Dirac cones in the organic salt \(\alpha\)-(BEDT-TTF)\(_2\)I\(_3\), we show that the excitonic instability is controlled by a small chemicalpotential shift and an in-plane magnetic field. In combined analyses based on renormalization-group approaches and ladder approximation, we demonstrate that the nuclear relaxation rate is an excellent probe of excitonic-spin fluctuations in an extended parameter region. Comparative nuclear magnetic resonance (NMR) experiments show good agreements with this result, jointly revealing the importance of intervalley nesting between field-induced, spin-split Fermi pockets of opposite charge polarities. Our work provides an accurate framework to search for excitonic instability of strongly-interacting massless fermions. |
| doi_str_mv | 10.48550/arxiv.1910.08999 |
| format | Article |
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| subjects | Cones Control stability Electrons Fermions Metalloids Nesting NMR Nuclear magnetic resonance Nuclear relaxation Organic chemistry Organic salts Physics - Other Condensed Matter Physics - Strongly Correlated Electrons Solid state physics Variation |
| title | Excitonic instability of two-dimensional tilted Dirac cones |
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