A terahertz-driven non-equilibrium phase transition in a room temperature atomic vapour.

A terahertz-driven non-equilibrium phase transition in a room temperature atomic vapour.
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DOI:
10.1038/s41467-018-05597-4
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发表时间:
2018-09-03
影响因子:
16.6
通讯作者:
Weatherill KJ
Weatherill KJ
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wade CG;Marcuzzi M;Levi E;Kondo JM;Lesanovsky I;Adams CS;Weatherill KJ

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There are few demonstrated examples of phase transitions that may be driven directly by terahertz frequency electric fields, and those that are known require field strengths exceeding 1 MV cm−1. Here we report a non-equilibrium phase transition driven by a weak (≪1 V cm−1), continuous-wave terahertz electric field. The system consists of room temperature caesium vapour under continuous optical excitation to a high-lying Rydberg state, which is resonantly coupled to a nearby level by the terahertz electric field. We use a simple model to understand the underlying physical behaviour, and we demonstrate two protocols to exploit the phase transition as a narrowband terahertz detector: the first with a fast (20 μs) non-linear response to nano-Watts of incident radiation, and the second with a linearised response and effective noise equivalent power ≤1 pW Hz−1/2. The work opens the door to a class of terahertz devices controlled with low-field intensities and operating in a room temperature environment. The nonlinear interaction between terahertz frequency electric fields and atoms or molecules can be used to study fundamental and technical problems. Here the authors demonstrate a THz–driven phase transition, with a potential application as a THz sensor, using Rydberg atomic states in a cesium vapor.
DOI: 10.1103/physrevlett.104.013001
发表时间: 2010-01-08
影响因子: 8.6
作者:
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DOI: 10.1063/1.333991
发表时间: 1984-01-01
影响因子: 3.2
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发表时间: 2013-11-22
期刊: PHYSICAL REVIEW A
影响因子: 2.9
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通讯作者: Clark, Charles W.
DOI: 10.1103/physrevlett.111.215305
发表时间: 2013-11-20
影响因子: 8.6
作者:
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DOI: 10.1103/physrevlett.111.113901
发表时间: 2013-09-10
影响因子: 8.6
作者:
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通讯作者: Weatherill, K. J.