Bibliographic Details
| Title: |
Negative-mass exciton polaritons induced by dissipative light-matter coupling in an atomically thin semiconductor |
| Authors: |
Wurdack, M., Yun, T., Katzer, M., Truscott, A. G., Knorr, A., Selig, M., Ostrovskaya, E. A., Estrecho, E. |
| Publication Year: |
2022 |
| Collection: |
Condensed Matter |
| Subject Terms: |
Condensed Matter - Mesoscale and Nanoscale Physics |
| More Details: |
Dispersion engineering is a powerful and versatile tool that can vary the speed of light signals and induce negative-mass effects in the dynamics of particles and quasiparticles. Here, we show that dissipative coupling between bound electron-hole pairs (excitons) and photons in an optical microcavity can lead to the formation of exciton polaritons with an inverted dispersion of the lower polariton branch and hence a negative mass. We perform direct measurements of the anomalous dispersion in atomically thin (monolayer) WS$_2$ crystals embedded in planar microcavities and demonstrate that the propagation direction of the negative-mass polaritons is opposite to their momentum. Our study introduces a new concept of non-Hermitian dispersion engineering for exciton polaritons and opens a pathway for realising new phases of quantum matter in a solid state.
Comment: 16 pages, 13 figures |
| Document Type: |
Working Paper |
| DOI: |
10.1038/s41467-023-36618-6 |
| Access URL: |
http://arxiv.org/abs/2204.04041 |
| Accession Number: |
edsarx.2204.04041 |
| Database: |
arXiv |
