Xiao Hongyi, Liu Andrea J, Durian Douglas J
Department of Physics and Astronomy, University of Pennsylvania, Philadelphia 19104, Pennsylvania, USA.
Phys Rev Lett. 2022 Jun 17;128(24):248001. doi: 10.1103/PhysRevLett.128.248001.
To search for experimental signals of the Gardner crossover, an active quasithermal granular glass is constructed using a monolayer of air-fluidized star-shaped particles. The pressure of the system is controlled by adjusting the tension exerted on an enclosing boundary. Velocity distributions of the internal particles and the scaling of the pressure, density, effective temperature, and relaxation time are examined, demonstrating that the system has key features of a thermal system. Using a pressure-based quenching protocol that brings the system into deeper glassy states, signals of the Gardner crossover are detected via cage size and separation order parameters for both particle positions and orientations, offering experimental evidence of Gardner physics for a system of anisotropic quasithermal particles in a low spatial dimension.
为了寻找加德纳转变的实验信号，使用单层气浮星形颗粒构建了一种活性准热颗粒玻璃。通过调节施加在封闭边界上的张力来控制系统的压力。研究了内部颗粒的速度分布以及压力、密度、有效温度和弛豫时间的标度，表明该系统具有热系统的关键特征。使用基于压力的猝灭方案使系统进入更深的玻璃态，通过粒子位置和取向的笼尺寸和分离序参量检测到加德纳转变的信号，为低空间维度的各向异性准热粒子系统提供了加德纳物理的实验证据。
