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arXiv · 2501.10997

Dissipative quantum phase transitions in electrically driven lasers

Lei-Lei Nian·Yi-Cheng Wang·Jin-Yi Wang·Long Xiong·Bo Zheng·Jing-Tao Lü
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Abstract

Embedding quantum dot circuits into microwave cavities has emerged as a novel platform for controlling photon emission statistics by electrical means. With such a circuit version of the Rabi model, we reveal previously undefined quantum phase transitions in electrically driven lasing regimes, which do not require deep strong light-matter couplings. For one-photon interaction, the scaling analysis indicates that the system undergoes a continuous phase transition from thermal to coherent photon emissions. Going beyond this, a discontinuous quantum phase transition from superbunched to coherent states in two-photon processes, accompanied by the bistability within a mean-field theory, is predicted. Both the order of phase transitions and the critical electron-photon coupling can be easily controlled by an electric field, while the tunneling current can be used as a fingerprint of such transitions. Our prediction, along with its extension to multiphoton processes, represents a key step towards accessing lasing phase transitions.

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Lei-Lei Nian, Yi-Cheng Wang, Jin-Yi Wang, Long Xiong, Bo Zheng, Jing-Tao Lü. 2025-04-11. Dissipative quantum phase transitions in electrically driven lasers. https://arxiv.org/abs/2501.10997

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