Gandolfi Marco, Giannetti Claudio, Banfi Francesco
CNR-INO (National Institute of Optics), Via Branze 45, 25123 Brescia, Italy.
Department of Information Engineering, University of Brescia, Via Branze 38, 25023 Brescia, Italy.
Phys Rev Lett. 2020 Dec 31;125(26):265901. doi: 10.1103/PhysRevLett.125.265901.
The temperonic crystal, a periodic structure with a unit cell made of two slabs sustaining temperature wavelike oscillations on short timescales, is introduced. The complex-valued dispersion relation for the temperature scalar field is investigated for the case of a localized temperature pulse. The dispersion discloses frequency gaps, tunable upon varying the slabs' thermal properties. Results are shown for the paradigmatic case of a graphene-based temperonic crystal. The temperonic crystal extends the concept of superlattices to the realm of temperature waves, allowing for coherent control of ultrafast temperature pulses in the hydrodynamic regime at above liquid nitrogen temperatures.
本文介绍了温度波晶体，它是一种具有周期性结构的晶体，其单胞由两个平板组成，能在短时间尺度上维持温度波状振荡。针对局部温度脉冲的情况，研究了温度标量场的复值色散关系。色散关系揭示了频率间隙，可通过改变平板的热特性进行调节。文中给出了基于石墨烯的温度波晶体这一典型案例的结果。温度波晶体将超晶格的概念扩展到温度波领域，使得在液氮温度以上的流体动力学区域中，能够对超快温度脉冲进行相干控制。
