Freiburg 2019 – wissenschaftliches Programm
FM 37.8: Talk
Dienstag, 24. September 2019, 15:45–16:00, 3042
Discrete quantum time crystal signature of nuclear spins coupled to nitrogen-vacancy centers in diamond — •Jianpei Geng — 3rd Institute of Physics, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany
In view of spacetime invariance, it is quite natural to consider about the concept of time crystal in analogy to crystal. A time crystal is expected to show periodic pattern in time and to break time translation symmetry. Although a quantum time crystal of a static equilibrium system has been ruled out, discrete quantum time crystal can exist for periodically driven systems. The discrete quantum time crystal signature has been observed in several systems such as trapped ions, ensemble nitrogen-vacancy centers, and nuclear spins in NMR samples. However, an insight what interaction of the system would lead to the time crystal signature is still lacking. Here, we broaden the insight by showing that nuclear spins with negligible coupling between each other can still exhibit discrete quantum time crystal signature. The time crystal signature is stimulated by the coupling between the nuclear spins and a nitrogen-vacancy center or coupled nitrogen-vacancy centers.