Transport characteristics of a $\mathcal{PT}$-symmetric non-Hermitian system: Effect of environmental interaction

• URL: http://arxiv.org/abs/2207.03308v1
• Date: Thu, 7 Jul 2022 14:11:34 GMT
• Title: Transport characteristics of a $\mathcal{PT}$-symmetric non-Hermitian system: Effect of environmental interaction
• Authors: Sudin Ganguly, Souvik Roy, and Santanu K. Maiti
• Abstract summary: An environment-mediated interaction can generally be described by a parity-time symmetric non-Hermitian system with a balanced distribution of physical gain and loss. It is quite known in the literature that along with the conventional junction current, another current called bias-driven circular current can be established in a loop geometry. This current, further, induces a strong magnetic field that can even reach to few Tesla. We address such issues considering a two-terminal ring geometry where the junction setup is described within a tight-binding framework.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The environmental influence is inevitable but often ignored in the study of electronic transport properties of small-scale systems. Such an environment-mediated interaction can generally be described by a parity-time symmetric non-Hermitian system with a balanced distribution of physical gain and loss. It is quite known in the literature that along with the conventional junction current, another current called bias-driven circular current can be established in a loop geometry depending upon the junction configuration. This current, further, induces a strong magnetic field that can even reach to few Tesla. What will happen to these quantities when the system interacts with its surrounding environment? Would it exhibit a detrimental response? We address such issues considering a two-terminal ring geometry where the junction setup is described within a tight-binding framework. All the transport quantities are evaluated using the standard Green's function formalism based on the Landauer-B\"{u}ttiker approach.

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