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A terahertz-driven non-equilibrium phase transition in a room temperature atomic vapour [dataset] Open Access

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 1MVcm−1. Here we report a non-equilibrium phase transition driven by a weak (≪ 1Vcm−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 narrow- band terahertz detector: the first with a fast (20 μs) nonlinear response to nano-Watts of incident radiation, and the second with a linearised response and effective noise equivalent power ≤ 1pWHz−1/2. The work opens the door to a different class of terahertz devices controlled with low field intensities and operating in a room-temperature environment.

Descriptions

Resource type
Dataset
Contributors
Creator: Kevin Weatherill 1
Contact person: Kevin Weatherill 1
Contact person: Christopher Wade 2
Data collector: Christopher Wade 2
Data collector: Matteo Marcuzzi 3
1 Durham University
2 Oxford University
3 University of Nottingham
Funder
Engineering and Physical Sciences Research Council
Seventh Framework Programme
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Research methods
Other description
Keyword
Terahertz
Rydberg
Subject
Terahertz technology
Rydberg states
Phase transformations (Statistical physics)
Location
Language
Cited in
Identifier
ark:/32150/r2s1784k74g
doi:10.15128/r2s1784k74g
Rights
Creative Commons Attribution 4.0 International (CC BY)

Publisher
Durham University
Date Created
July 5th 2018

File Details

Depositor
K.J. Weatherill
Date Uploaded
Date Modified
6 July 2018, 12:07:04
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File format: zip (ZIP Format)
Mime type: application/zip
File size: 82123423
Last modified: 2018:07:05 11:28:22+01:00
Filename: Archive.zip
Original checksum: ba3e5cc821d5b17b654749455f96b467
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