An Electrically Pumped Topological Polariton Laser.

Area of Science:

• Condensed matter physics
• Quantum optics
• Photonics

Background:

• Topology concepts have been integrated into optical systems, with topological lasers showing promise for applications.
• Most experimental studies on topological structures utilize laser excitation, limiting their practical application.

Purpose of the Study:

• To investigate the electrical excitation of topological lasers in a lattice of vertical resonator polariton micropillars.
• To demonstrate polariton lasing from a topological defect under electrical stimulation.
• To confirm the preservation of topological properties in the polariton band structure despite electrical contacts and doping.

Main Methods:

• Fabrication of a lattice of vertical resonator polariton micropillars.
• Formation of an exponentially localized topological Su-Schrieffer-Heeger defect.
• Electrical excitation using a carefully placed gold contact.
• Analysis of polariton band structure and lasing properties.

Main Results:

• Successful electrical excitation of polariton lasing from the topological defect.
• Preservation of topological properties in the polariton band structure under electrical excitation.
• Highly efficient lasing achieved in the weak coupling regime at high excitation power, exceeding Mott density.

Conclusions:

• This work represents a significant advancement towards applied topological lasers utilizing vertical resonator microcavity structures.
• Electrical excitation offers a viable pathway for practical topological laser devices.
• The demonstrated system maintains topological integrity, crucial for robust device performance.