AC Josephson effect between two superfluid time crystals

被引：56
作者：
Autti, S. [1 ,2 ]
Heikkinen, P. J. [1 ,3 ]
Makinen, J. T. [1 ,4 ,5 ]
Volovik, G. E. [1 ,6 ]
Zavjalov, V. V. [1 ,2 ]
Eltsov, V. B. [1 ]
机构：
[1] Aalto Univ, Dept Appl Phys, Low Temp Lab, Espoo, Finland
[2] Univ Lancaster, Dept Phys, Lancaster, England
[3] Royal Holloway Univ London, Dept Phys, Egham, Surrey, England
[4] Yale Univ, Dept Phys, New Haven, CT USA
[5] Yale Univ, Yale Quantum Inst, New Haven, CT USA
[6] LD Landau Inst Theoret Phys, Moscow, Russia
来源：
NATURE MATERIALS | 2021年 / 20卷 / 02期
基金：
欧盟地平线“2020”;
关键词：
MAGNONS; FORK;
D O I：
10.1038/s41563-020-0780-y
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Quantum time crystals are systems characterized by spontaneously emerging periodic order in the time domain(1). While originally a phase of broken time translation symmetry was a mere speculation(2), a wide range of time crystals has been reported(3-5). However, the dynamics and interactions between such systems have not been investigated experimentally. Here we study two adjacent quantum time crystals realized by two magnon condensates in superfluid(3)He-B. We observe an exchange of magnons between the time crystals leading to opposite-phase oscillations in their populations-a signature of the AC Josephson effect(6)-while the defining periodic motion remains phase coherent throughout the experiment. Our results demonstrate that time crystals obey the general dynamics of quantum mechanics and offer a basis to further investigate the fundamental properties of these phases, opening pathways for possible applications in developing fields, such as quantum information processing. Two adjacent quantum time crystals implemented by two magnon condensates in the superfluid B-phase of helium-3 are observed to coherently exchange magnons as a manifestation of the AC Josephson effect, offering insights on the dynamics and interactions between these phases of matter.
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页码：171 / +
页数：5
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