Keldysh field theory of dynamical exciton condensation transitions in nonequilibrium electron-hole bilayers
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| Format: | Preprint |
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2023
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| _version_ | 1866909240119001088 |
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| author | Zeng, Yongxin Crépel, Valentin Millis, Andrew J. |
| author_facet | Zeng, Yongxin Crépel, Valentin Millis, Andrew J. |
| contents | Recent experiments have realized steady-state electrical injection of interlayer excitons in electron-hole bilayers subject to a large bias voltage. In the ideal case in which interlayer tunneling is negligibly weak, the system is in quasi-equilibrium with a reduced effective band gap. Interlayer tunneling introduces a current and drives the system out of equilibrium. In this work we derive a nonequilibrium field theory description of interlayer excitons in biased electron-hole bilayers. In the large bias limit, we find that p-wave interlayer tunneling reduces the effective band gap and increases the effective temperature for intervalley excitons. We discuss possible experimental implications for InAs/GaSb quantum wells and transition metal dichalcogenide bilayers. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2311_04074 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Keldysh field theory of dynamical exciton condensation transitions in nonequilibrium electron-hole bilayers Zeng, Yongxin Crépel, Valentin Millis, Andrew J. Mesoscale and Nanoscale Physics Strongly Correlated Electrons Recent experiments have realized steady-state electrical injection of interlayer excitons in electron-hole bilayers subject to a large bias voltage. In the ideal case in which interlayer tunneling is negligibly weak, the system is in quasi-equilibrium with a reduced effective band gap. Interlayer tunneling introduces a current and drives the system out of equilibrium. In this work we derive a nonequilibrium field theory description of interlayer excitons in biased electron-hole bilayers. In the large bias limit, we find that p-wave interlayer tunneling reduces the effective band gap and increases the effective temperature for intervalley excitons. We discuss possible experimental implications for InAs/GaSb quantum wells and transition metal dichalcogenide bilayers. |
| title | Keldysh field theory of dynamical exciton condensation transitions in nonequilibrium electron-hole bilayers |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2311.04074 |