期刊
PHYSICAL REVIEW B
卷 103, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.103.104106
关键词
-
资金
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [CRC 1227, CRC TRR 306 QuCoLiMa]
- EMPIR programme [17FUN07 CC4C]
- German Ministry of Education and Research (BMBF) via the QuantERA project NAQUAS
- QuantERA ERA-NET Cofund in Quantum Technologies within the European Union's Horizon2020 program
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germanys Excellence Strategy EXC-2123 QuantumFrontiers [390837967]
- European Union's Horizon 2020 research and innovation programme
This study investigated the normal-mode spectrum of a trapped ion chain at the symmetry-breaking linear to zigzag transition and at finite temperatures. Although the expected mode softening at the critical point was not observed experimentally, numerical simulations suggest that this is due to the finite temperature of the chain. The study developed an effective analytical model to reproduce the low-frequency spectrum as a function of temperature and close to the transition point, providing insights into the frequency shift of the soft mode and the effect of anharmonic coupling with high-frequency modes.
We investigate the normal-mode spectrum of a trapped ion chain at the symmetry-breaking linear to zigzag transition and at finite temperatures. For this purpose, we modulate the amplitude of the Doppler cooling laser to excite and measure mode oscillations. The expected mode softening at the critical point, a signature of the second-order transition, is not observed. Numerical simulations show that this is mainly due to the finite temperature of the chain. Inspection of the trajectories suggest that the thermal shifts of the normal-mode spectrum can be understood by the ions collectively jumping between the two ground-state configurations of the symmetry-broken phase. We develop an effective analytical model, which allows us to reproduce the low-frequency spectrum as a function of the temperature and close to the transition point. In this model, the frequency shift of the soft mode is due to the anharmonic coupling with the high-frequency modes of the spectrum, acting as an averaged effective thermal environment. Our study could prove important for implementing ground-state laser cooling close to the critical point.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据