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Cavity Induced Collective Behavior in the Polaritonic Ground State

by V. Rokaj, S. I. Mistakidis, H. R. Sadeghpour

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Submission summary

Authors (as registered SciPost users): Simeon Mistakidis · Vasil Rokaj · H. R. Sadeghpour
Submission information
Preprint Link: scipost_202212_00059v2  (pdf)
Date submitted: 2023-03-03 18:01
Submitted by: Rokaj, Vasil
Submitted to: SciPost Physics
Ontological classification
Academic field: Physics
Specialties:
  • Atomic, Molecular and Optical Physics - Theory
  • Condensed Matter Physics - Theory
  • Quantum Physics
Approach: Theoretical

Abstract

Cavity quantum electrodynamics provides an ideal platform to engineer and control light-matter interactions with polariton quasiparticles. In this work, we investigate collective phenomena in a system of many particles in a harmonic trap coupled to a homogeneous cavity vacuum field. The system couples collectively to the cavity field, through its center of mass, and collective polariton states emerge. The cavity field mediates pairwise long-range interactions and enhances the effective mass of the particles. This leads to an enhancement of localization in the matter ground state density, which features a maximum when light and matter are on resonance, and demonstrates a Dicke-like, collective behavior with the particle number. The light-matter interaction also modifies the photonic properties of the polariton system, as the ground state is populated with bunched photons. In addition, it is shown that the diamagnetic $\mathbf{A}^2$ term is necessary for the stability of the system, as otherwise the superradiant ground state instability occurs. We demonstrate that coherent transfer of polaritonic population is possbile with an external magnetic field and by monitoring the Landau-Zener transition probability.

Author comments upon resubmission

We would like to thank all referees, in this and the previous review round, for taking the time and putting the effort to review our manuscript. In the revised manuscript, we have taken all comments into consideration and we have accordingly revised the manuscript.

To ease reading in the link below we provide a pdf file with a detailed reply to all the points raised by the third referee and the requested changes. Further, in the reply letter we have kept the statements of the referees in italics. Also we provide a list of the most important changes we have made as well as a version of the manuscript with the changes in red.

https://drive.google.com/file/d/1o9VqIPxGLoJHhgJXKjHDMgu41r6KXj5q/view?usp=share_link
Current status:
Has been resubmitted

Reports on this Submission

Report #1 by Anonymous (Referee 1) on 2023-3-17 (Invited Report)

  • Cite as: Anonymous, Report on arXiv:scipost_202212_00059v2, delivered 2023-03-17, doi: 10.21468/SciPost.Report.6915

Strengths

-Original problem
- Analytical results
- Rather well written

Weaknesses

Paper quite long

Report

In my opinion, the authors have properly replied to my previous comments.

In particular, it is now clearer for me that the authors consider the matter part of their system to be two dimensional. I think this could be mentioned at the start of the paper. From what I can see, in the present version of the manuscript, the fact that R is a two-dimensional vector is only stated below Equation 8 on page 6.

Also, I believe that there is a small misprint below Eq. 2 where the polarization index is denoted \lambda while the letter \nu is used in the equations.

Otherwise, I think the paper meets the criteria for publication.

Requested changes

See report

  • validity: good
  • significance: good
  • originality: good
  • clarity: good
  • formatting: good
  • grammar: good

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