各向异性狄拉克材料中定向暗物质探测
Directional Dark Matter Detection in Anisotropic Dirac Materials
摘要：
狄拉克材料，由于其小的${\cal O}(\mbox{meV})$带隙，是一个有前途的目标暗光子介导的散射和吸收的光暗物质。在本文中，我们描述了日常调制率的暗物质与狄拉克材料相互作用，由于在其晶体结构的各向异性。我们表明，日常调制是一个${\cal O}(1)$分数的总速率暗物质散射的狄拉克材料ZrTe $_5$。当存在时，调制由材料的介电张量相对于暗物质风的方向决定，并且当晶体被定向为使得暗物质风在一天中的两个不同时间与介电张量的最大和最小分量完全对准时，调制最大化。由于大调制，任何假定的暗物质散射信号都可以通过改变晶体相对于风的方向并观察每日调制模式如何变化来快速验证或排除。
英文摘要：
Dirac materials, because of their small ${\cal O}(\mbox{meV})$ band gap, are a promising target for dark photon-mediated scattering and absorption of light dark matter. In this paper, we characterize the daily modulation rate of dark matter interacting with a Dirac material due to anisotropies in their crystal structure. We show that daily modulation is an ${\cal O}(1)$ fraction of the total rate for dark matter scattering in the Dirac material ZrTe$_5$. When present, the modulation is dominated by the orientation of the material's dielectric tensor with respect to the dark matter wind, and is maximized when the crystal is oriented such that the dark matter wind is completely aligned with the largest and smallest components of the dielectric tensor at two different times of the day. Because of the large modulation, any putative dark matter scattering signal could be rapidly verified or ruled out by changing the orientation of the crystal with respect to the wind and observing how the daily modulation pattern changes.
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