期刊
SCIENCE
卷 368, 期 6487, 页码 190-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aax5850
关键词
-
资金
- NSF
- AFOSR
- ARO
- AFOSR MURI on Exotic Phases of Matter
- David and Lucile Packard Foundation
- Gordon and Betty Moore Foundation [GBMF5279]
- NSF GRFP
The emergence of quasiparticles in interacting matter represents one of the cornerstones of modern physics. However, in the vicinity of a quantum critical point, the existence of quasiparticles comes under question. Here, we created Bose polarons near quantum criticality by immersing atomic impurities in a Bose-Einstein condensate (BEC) with near-resonant interactions. Using radiofrequency spectroscopy, we probed the energy, spectral width, and short-range correlations of the impurities as a function of temperature. Far below the superfluid critical temperature, the impurities formed well-defined quasiparticles. Their inverse lifetime, given by their spectral width, increased linearly with temperature at the so-called Planckian scale, consistent with quantum critical behavior. Close to the BEC critical temperature, the spectral width exceeded the impurity's binding energy, signaling a breakdown of the quasiparticle picture.
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