Search for Axionlike Dark Matter Using Solid-State Nuclear Magnetic Resonance
Search for Axionlike Dark Matter Using Solid-State Nuclear Magnetic Resonance
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DOI：
10.1103/physrevlett.126.141802
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发表时间：
2021-04-09
影响因子：
8.6
通讯作者：
Sushkov, Alexander O.
中科院分区：
文献类型：
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作者：
Aybas, Deniz;Adam, Janos;Sushkov, Alexander O.
我们报告的超轻类轴子暗物质的质量范围162-166 neV的实验搜索结果。我们的宇宙轴子自旋进动实验的检测方案是基于一个精密测量的Pb-207固体核磁共振极化铁电晶体。类轴暗物质可以通过电偶极矩耦合g（d）或梯度耦合g（aNN）对Pb-20（7）核自旋施加振荡力矩。我们校准了探测器，并在4.4 T磁场下用脉冲磁共振测量表征了核自旋系综的激发谱和弛豫参数。我们扫描这个值附近的磁场，并在以39.65 MHz为中心的1 MHz频带内搜索具有康普顿频率的轴子状暗物质。我们的测量将上界垂直条g（d）vertical bar < 9.5 x 10（-4）GeV-2和垂直条g（aNN）vertical bar（）< 2.8 x 10（-1）GeV-1（95%置信水平）置于该频率范围内。对gd的约束对应于中子电偶极矩振荡幅度的上限为1.0 × 10（-21）e cm，量子色动力学CP破坏θ参数振荡幅度的上限为4.3 × 10（-6）。我们的研究结果表明，使用固态核磁共振在neV质量范围内寻找类轴子暗物质的可行性。
We report the results of an experimental search for ultralight axionlike dark matter in the mass range 162-166 neV. The detection scheme of our Cosmic Axion Spin Precession Experiment is based on a precision measurement of Pb-207 solid-state nuclear magnetic resonance in a polarized ferroelectric crystal. Axionlike dark matter can exert an oscillating torque on Pb-20(7) nuclear spins via the electric dipole moment coupling g(d) or via the gradient coupling g(aNN). We calibrate the detector and characterize the excitation spectrum and relaxation parameters of the nuclear spin ensemble with pulsed magnetic resonance measurements in a 4.4 T magnetic field. We sweep the magnetic field near this value and search for axionlike dark matter with Compton frequency within a 1 MHz band centered at 39.65 MHz. Our measurements place the upper bounds vertical bar g(d)vertical bar < 9.5 x 10(-4) GeV-2 and vertical bar g(aNN)vertical bar( )< 2.8 x 10(-1) GeV-1 (95% confidence level) in this frequency range. The constraint on g d corresponds to an upper bound of 1.0 x 10(-21) e cm on the amplitude of oscillations of the neutron electric dipole moment and 4.3 x 10(-6) on the amplitude of oscillations of CP-violating theta parameter of quantum chromodynamics. Our results demonstrate the feasibility of using solid-state nuclear magnetic resonance to search for axionlike dark matter in the neV mass range.