Carmichael Calvin, Ortiz Jorge Martinez, Adamson Parker, Matthews Lorin, Hyde Truell
CASPER (Center for Astrophysics, Space Physics, and Engineering Research), <a href="https://ror.org/005781934">Baylor University</a>, Waco, Texas 76798, USA.
Phys Rev E. 2024 Aug;110(2-2):025205. doi: 10.1103/PhysRevE.110.025205.
Rotating quasipaired particles (torsions) are observed within a two-dimensional monolayer crystal suspended in an argon complex plasma for discharge powers of 1-10 W and pressures of 135-155 mTorr. The inclusion of a torsion in a crystal lattice fundamentally changes the overall lattice state to a "hot crystal." A torsion increases the particle motion and kinetic energy of other particles in the crystal, with the strongest effects on neighboring particles. The apparent effective range is to the third nearest neighbor, with the kinetic energy in the first three shells of particles increasing by at least 200% over baseline values for the crystal. However, the variance of the motion of all particles in the crystal increases by more than two times over the average background kinetic fluctuations for the whole crystal. The formation of a torsion perturbs the structure and symmetry of a plasma crystal. A single torsion causes the average interparticle spacing to increase by 11% compared to the same crystal without a torsion. Particles in the first two shells surrounding a torsion also display reduced hexagonal symmetry. The combination of the perturbed lattice structure and the larger range of motion for the microparticles contribute to a higher-energy-state crystal when torsions are present.
在悬浮于氩复合等离子体中的二维单层晶体中，当放电功率为1 - 10瓦且压力为135 - 155毫托时，观察到了旋转的准配对粒子（扭转）。晶格中包含一个扭转会从根本上改变整个晶格状态为“热晶体”。一个扭转会增加晶体中其他粒子的运动和动能，对相邻粒子的影响最强。明显的有效范围是到第三近邻，晶体中前三壳层粒子的动能比晶体的基线值增加至少200%。然而，晶体中所有粒子运动的方差比整个晶体的平均背景动能涨落增加了两倍多。扭转的形成扰乱了等离子体晶体的结构和对称性。与没有扭转的相同晶体相比，单个扭转会使平均粒子间距增加11%。围绕扭转的前两壳层中的粒子也显示出六边形对称性降低。当存在扭转时，晶格结构的扰动和微粒更大的运动范围共同导致了更高能态的晶体。
