Two-dimensional spectroscopy of bosonic collective excitations in disordered many-body systems

• URL: http://arxiv.org/abs/2501.16856v1
• Date: Tue, 28 Jan 2025 11:11:18 GMT
• Title: Two-dimensional spectroscopy of bosonic collective excitations in disordered many-body systems
• Authors: Alex Gómez Salvador, Ivan Morera, Marios H. Michael, Pavel E. Dolgirev, Danica Pavicevic, Albert Liu, Andrea Cavalleri, Eugene Demler,
• Abstract summary: We present a novel theoretical approach for computing and analyzing two-dimensional spectroscopy of bosonic collective excitations in disordered many-body systems. We employ the Keldysh formalism to derive the nonlinear response and obtain two-dimensional spectroscopy maps with particular emphasis on the rephasing sector.
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• Abstract: We present a novel theoretical approach for computing and analyzing two-dimensional spectroscopy of bosonic collective excitations in disordered many-body systems. Specifically, we employ the Keldysh formalism to derive the nonlinear response and obtain two-dimensional spectroscopy maps with particular emphasis on the rephasing sector, which allows to disentangle different sources of broadening. Our many-body approach successfully distinguishes elastic and inelastic scattering mechanisms contributing to the excitation linewidth. Additionally, using a non-perturbative conserving approach, we demonstrate that the echo peak exhibits a universal asymmetric shape in the sole presence of static disorder, a feature that remains robust against quantum fluctuations. This is in stark contrast to the standard theory based on isolated two-level systems, which fails to account for the dispersive nature of excitations and the interactions between different momentum components.

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