Two-terminal transport with two-body loss
ORAL
Abstract
Recent experimental progress in ultracold atomic gases has attracted attention because such systems enable to introduce precisely controlled dissipation, such as local two-body loss [1]. Especially in transport measurements, particle loss opens a new transport channel, which fundamentally alter the transport properties of the system. Although the effect of one-body loss can be described as an imaginary correction to the dynamics of a free-particle, the effect of two-body loss behaves like an interaction, which makes it difficult to analyze by means of conventional theoretical approaches based on the quantum master equation.
As an approach to avoid this problem, operator representation of dissipation has been developed, in which particle loss is treated as stochastic fluctuations. In this framework, we can analyze quantum many-body systems with dissipation using a conventional field-theoretical manner [2, 3]. Motivated by these advances, we investigate a two-terminal transport system where two-body loss occurs at the center of one-dimensional chain.
Using operator representation of two-body loss, we reveal the dissipative effects on the transport properties. The major findings of this research are that the effective dissipation strength of two-body loss depends on the occupation number at the central lossy site, and that two-body loss suppresses the particle current weaker than that of one-body loss [4].
As an approach to avoid this problem, operator representation of dissipation has been developed, in which particle loss is treated as stochastic fluctuations. In this framework, we can analyze quantum many-body systems with dissipation using a conventional field-theoretical manner [2, 3]. Motivated by these advances, we investigate a two-terminal transport system where two-body loss occurs at the center of one-dimensional chain.
Using operator representation of two-body loss, we reveal the dissipative effects on the transport properties. The major findings of this research are that the effective dissipation strength of two-body loss depends on the occupation number at the central lossy site, and that two-body loss suppresses the particle current weaker than that of one-body loss [4].
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Publication: [1] M.-Z. Huang, P. Fabritius, J. Mohan, M. Talebi, S. Wili, and T. Esslinger, Saturation of Thermal and Spin Conductances in a Dissipative Superfluid Junction, Phys. Rev. Lett. 134, 253403 (2025).
[2] P. E. Dolgirev, J. Marino, D. Sels, and E. Demler, Non-Gaussian correlations imprinted by local dephasing in fermionic wires, Phys. Rev. B 102, 100301(R) (2020).
[3] T. Jin, J. a. S. Ferreira, M. Filippone, and T. Giamarchi, Exact description of quantum stochastic models as quantum resistors, Phys. Rev. Res. 4, 013109 (2022).
[4] K. Kakimoto and S. Uchino, arXiv:2505.24391
Presenters
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Kensuke Kakimoto
- Waseda university