Detection of sub-MeV dark matter with three-dimensional Dirac materials
Detection of sub-MeV dark matter with three-dimensional Dirac materials
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DOI：
10.1103/physrevd.97.015004
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发表时间：
2017-08
影响因子：
5
通讯作者：
Y. Hochberg;Y. Kahn;M. Lisanti;K. Zurek;A. Grushin;R. Ilan;S. Griffin;Zhen-Fei Liu;S. Weber
中科院分区：
文献类型：
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作者：
Y. Hochberg;Y. Kahn;M. Lisanti;K. Zurek;A. Grushin;R. Ilan;S. Griffin;Zhen-Fei Liu;S. Weber
我们建议使用三维狄拉克材料作为直接探测亚兆电子伏暗物质的目标。狄拉克材料的特点是在低能电子激发下具有线性色散，如果晶格对称性被打破，其带隙很小，为0 （meV）。keV尺度的暗物质携带的动能小至几meV，可以散射并激发电子穿过间隙。或者，轻至几兆电子伏的玻色子暗物质可以被靶中的电子吸收。我们发展了暗物质在狄拉克材料中的散射和吸收的形式，并计算了这些目标材料的实验范围。我们发现狄拉克材料可以在探测keV到MeV质量范围内的暗物质方面发挥关键作用，这些暗物质通过动力学混合暗光子与电子散射，因为暗光子不会形成中等有效质量。同样的目标材料在meV到数百meV的质量范围内对光玻色子暗物质的吸收具有优异的灵敏度，优于所有其他现有的暗物质是动力学混合暗光子的提议。
We propose the use of three-dimensional Dirac materials as targets for direct detection of sub-MeV dark matter. Dirac materials are characterized by a linear dispersion for low-energy electronic excitations, with a small band gap of O(meV) if lattice symmetries are broken. Dark matter at the keV scale carrying kinetic energy as small as a few meV can scatter and excite an electron across the gap. Alternatively, bosonic dark matter as light as a few meV can be absorbed by the electrons in the target. We develop the formalism for dark matter scattering and absorption in Dirac materials and calculate the experimental reach of these target materials. We find that Dirac materials can play a crucial role in detecting dark matter in the keV to MeV mass range that scatters with electrons via a kinetically mixed dark photon, as the dark photon does not develop an in-medium effective mass. The same target materials provide excellent sensitivity to absorption of light bosonic dark matter in the meV to hundreds of meV mass range, superior to all other existing proposals when the dark matter is a kinetically mixed dark photon.