Directional Goldstone waves in polariton condensates close to equilibrium

Dario Ballarini; Davide Caputo; Galbadrakh Dagvadorj; Richard Juggins; Milena De Giorgi; Lorenzo Dominici; Kenneth West; Loren N. Pfeiffer; Giuseppe Gigli; Marzena H. Szymańska; Daniele Sanvitto

doi:10.1038/s41467-019-13733-x

Directional Goldstone waves in polariton condensates close to equilibrium

Dario Ballarini, Davide Caputo, Galbadrakh Dagvadorj, Richard Juggins, Milena De Giorgi, Lorenzo Dominici, Kenneth West, Loren N. Pfeiffer, Giuseppe Gigli, Marzena H. Szymańska, Daniele Sanvitto

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

Quantum fluids of light are realized in semiconductor microcavities using exciton-polaritons, solid-state quasi-particles with a light mass and sizeable interactions. Here, we use the microscopic analogue of oceanographic techniques to measure the excitation spectrum of a thermalised polariton condensate. Increasing the fluid density, we demonstrate the transition from a free-particle parabolic dispersion to a linear, sound-like Goldstone mode characteristic of superfluids at equilibrium. Notably, we reveal the effect of an asymmetric pumping by showing that collective excitations are created with a definite direction with respect to the condensate. Furthermore, we measure the critical sound speed for polariton superfluids close to equilibrium.

Original language	English (US)
Article number	217
Journal	Nature communications
Volume	11
Issue number	1
DOIs	https://doi.org/10.1038/s41467-019-13733-x
State	Published - Dec 1 2020
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Chemistry
General Biochemistry, Genetics and Molecular Biology
General Physics and Astronomy

Access to Document

10.1038/s41467-019-13733-x

Cite this

@article{8cf2c206b19548f6b8eade331d7b438d,

title = "Directional Goldstone waves in polariton condensates close to equilibrium",

abstract = "Quantum fluids of light are realized in semiconductor microcavities using exciton-polaritons, solid-state quasi-particles with a light mass and sizeable interactions. Here, we use the microscopic analogue of oceanographic techniques to measure the excitation spectrum of a thermalised polariton condensate. Increasing the fluid density, we demonstrate the transition from a free-particle parabolic dispersion to a linear, sound-like Goldstone mode characteristic of superfluids at equilibrium. Notably, we reveal the effect of an asymmetric pumping by showing that collective excitations are created with a definite direction with respect to the condensate. Furthermore, we measure the critical sound speed for polariton superfluids close to equilibrium.",

author = "Dario Ballarini and Davide Caputo and Galbadrakh Dagvadorj and Richard Juggins and Giorgi, {Milena De} and Lorenzo Dominici and Kenneth West and Pfeiffer, {Loren N.} and Giuseppe Gigli and Szyma{\'n}ska, {Marzena H.} and Daniele Sanvitto",

note = "Publisher Copyright: {\textcopyright} 2020, The Author(s).",

year = "2020",

month = dec,

day = "1",

doi = "10.1038/s41467-019-13733-x",

language = "English (US)",

volume = "11",

journal = "Nature communications",

issn = "2041-1723",

publisher = "Nature Research",

number = "1",

}

TY - JOUR

T1 - Directional Goldstone waves in polariton condensates close to equilibrium

AU - Ballarini, Dario

AU - Caputo, Davide

AU - Dagvadorj, Galbadrakh

AU - Juggins, Richard

AU - Giorgi, Milena De

AU - Dominici, Lorenzo

AU - West, Kenneth

AU - Pfeiffer, Loren N.

AU - Gigli, Giuseppe

AU - Szymańska, Marzena H.

AU - Sanvitto, Daniele

PY - 2020/12/1

Y1 - 2020/12/1

N2 - Quantum fluids of light are realized in semiconductor microcavities using exciton-polaritons, solid-state quasi-particles with a light mass and sizeable interactions. Here, we use the microscopic analogue of oceanographic techniques to measure the excitation spectrum of a thermalised polariton condensate. Increasing the fluid density, we demonstrate the transition from a free-particle parabolic dispersion to a linear, sound-like Goldstone mode characteristic of superfluids at equilibrium. Notably, we reveal the effect of an asymmetric pumping by showing that collective excitations are created with a definite direction with respect to the condensate. Furthermore, we measure the critical sound speed for polariton superfluids close to equilibrium.

AB - Quantum fluids of light are realized in semiconductor microcavities using exciton-polaritons, solid-state quasi-particles with a light mass and sizeable interactions. Here, we use the microscopic analogue of oceanographic techniques to measure the excitation spectrum of a thermalised polariton condensate. Increasing the fluid density, we demonstrate the transition from a free-particle parabolic dispersion to a linear, sound-like Goldstone mode characteristic of superfluids at equilibrium. Notably, we reveal the effect of an asymmetric pumping by showing that collective excitations are created with a definite direction with respect to the condensate. Furthermore, we measure the critical sound speed for polariton superfluids close to equilibrium.

UR - http://www.scopus.com/inward/record.url?scp=85077675748&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85077675748&partnerID=8YFLogxK

U2 - 10.1038/s41467-019-13733-x

DO - 10.1038/s41467-019-13733-x

M3 - Article

C2 - 31924751

AN - SCOPUS:85077675748

SN - 2041-1723

VL - 11

JO - Nature communications

JF - Nature communications

IS - 1

M1 - 217

ER -

Directional Goldstone waves in polariton condensates close to equilibrium

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this