Crossover in Electronic Specific Heat near Narrow-Sense Type-III Dirac Cones
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| Format: | Preprint |
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2025
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| _version_ | 1866916894801395712 |
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| author | Kishigi, Keita Hasegawa, Yasumasa |
| author_facet | Kishigi, Keita Hasegawa, Yasumasa |
| contents | Two-dimensional massless Dirac fermions exhibit Dirac cones, which are classified into three types: type-I, type-II, and type-III. In both type-I and type-II cones, the energy dispersion is linear in all momentum directions. Type-I cones are characterized by a non-overtilted structure, where the Dirac point serves as a local minimum (maximum) for the upper (lower) band. In contrast, type-II cones exhibit overtilted dispersions, leading to the coexistence of electron and hole pockets. At the critical tilt, the linear energy dispersion vanishes in one momentum direction, corresponding to a type-III Dirac cone. We further define a special case, termed the "narrow-sense" type-III cone, where not only the linear term but also quadratic and higher-order terms vanish, resulting in a completely flat dispersion along one direction. In this work, we numerically investigate the temperature ($T$) -dependence of the electronic specific heat ($C$), as the Dirac cone is continuously tilted from type-I to narrow-sense type-III. A model with particle-hole symmetry is employed to ensure that the chemical potential ($μ$) remains temperature independent. Our results reveal a notable crossover in $C$ near narrow-sense type-III, where $C$ changes from $C \propto T^{2}$ below the crossover temperature ($T_{\rm co}$) to $C \propto T^{\frac{1}{2}}$ above $T_{\rm co}$. This crossover is attributed to the energy-dependent structure of the density of states. The present findings suggest a feasible approach for experimentally probing the degree of Dirac cone tilting near the narrow-sense type-III limit. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_12779 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Crossover in Electronic Specific Heat near Narrow-Sense Type-III Dirac Cones Kishigi, Keita Hasegawa, Yasumasa Mesoscale and Nanoscale Physics Materials Science Two-dimensional massless Dirac fermions exhibit Dirac cones, which are classified into three types: type-I, type-II, and type-III. In both type-I and type-II cones, the energy dispersion is linear in all momentum directions. Type-I cones are characterized by a non-overtilted structure, where the Dirac point serves as a local minimum (maximum) for the upper (lower) band. In contrast, type-II cones exhibit overtilted dispersions, leading to the coexistence of electron and hole pockets. At the critical tilt, the linear energy dispersion vanishes in one momentum direction, corresponding to a type-III Dirac cone. We further define a special case, termed the "narrow-sense" type-III cone, where not only the linear term but also quadratic and higher-order terms vanish, resulting in a completely flat dispersion along one direction. In this work, we numerically investigate the temperature ($T$) -dependence of the electronic specific heat ($C$), as the Dirac cone is continuously tilted from type-I to narrow-sense type-III. A model with particle-hole symmetry is employed to ensure that the chemical potential ($μ$) remains temperature independent. Our results reveal a notable crossover in $C$ near narrow-sense type-III, where $C$ changes from $C \propto T^{2}$ below the crossover temperature ($T_{\rm co}$) to $C \propto T^{\frac{1}{2}}$ above $T_{\rm co}$. This crossover is attributed to the energy-dependent structure of the density of states. The present findings suggest a feasible approach for experimentally probing the degree of Dirac cone tilting near the narrow-sense type-III limit. |
| title | Crossover in Electronic Specific Heat near Narrow-Sense Type-III Dirac Cones |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2504.12779 |