Optical signatures of dynamical excitonic condensates

• URL: http://arxiv.org/abs/2410.22116v1
• Date: Tue, 29 Oct 2024 15:16:44 GMT
• Title: Optical signatures of dynamical excitonic condensates
• Authors: Alexander Osterkorn, Yuta Murakami, Tatsuya Kaneko, Zhiyuan Sun, Andrew J. Millis, Denis Golež,
• Abstract summary: We show that optical spectroscopy can experimentally identify phase-trapped and phase-delocalized dynamical regimes of condensation. In the weak-bias regime, the trapped dynamics of the order parameter's phase lead to an in-gap absorption line at a frequency almost independent of the bias voltage. Close to the transition between the trapped and freely oscillating states, we find a strong response upon application of a weak electric probe field.
• Score: 38.42595111719131
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• Abstract: We theoretically study dynamical excitonic condensates occurring in bilayers with an imposed chemical potential difference and in photodoped semiconductors. We show that optical spectroscopy can experimentally identify phase-trapped and phase-delocalized dynamical regimes of condensation. In the weak-bias regime, the trapped dynamics of the order parameter's phase lead to an in-gap absorption line at a frequency almost independent of the bias voltage, while for larger biases, the frequency of the spectral feature increases approximately linearly with bias. In both cases there is a pronounced second harmonic response. Close to the transition between the trapped and freely oscillating states, we find a strong response upon application of a weak electric probe field and compare the results to those found in a minimal model description for the dynamics of the order parameter's phase and analyze the limitations of the latter.

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