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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

5 July 2018, 10:07:06

Date Modified

6 July 2018, 12:07:04

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Characterization

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