Multiphonon excitations from dark matter scattering in crystals
Multiphonon excitations from dark matter scattering in crystals
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晶体中暗物质散射的多声子激发
DOI：
10.1103/physrevd.101.036006
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发表时间：
2020
影响因子：
5
通讯作者：
Melia Tom
中科院分区：
文献类型：
--
作者：
Campbell-Deem Brian;Cox Peter;Knapen Simon;Lin Tongyan;Melia Tom
为了直接探测亚兆电子伏暗物质，一种很有前途的策略是在晶体中寻找单个声子的激发。我们对轻暗物质（）在GaAs、Ge、Si和金刚石等立方晶体中散射产生两个声子的速率进行了分析计算。多声子速率总是小于产生单个光学声子的速率，只要后者在运动上是可接近的。在硅和金刚石中，有一个暗物质质量范围，根据实验阈值，多声子的产生可能是最有前途的过程。
For direct detection of sub-MeV dark matter, a promising strategy is to search for individual phonon excitations in a crystal. We perform an analytic calculation of the rate for light dark matter () to produce two acoustic phonons through scattering in cubic crystals such as GaAs, Ge, Si, and diamond. The multiphonon rate is always smaller than the rate to produce a single optical phonon, whenever the latter is kinematically accessible. In Si and diamond, there is a dark matter mass range for which multiphonon production can be the most promising process, depending on the experimental threshold.