Dissipation-induced Half Quantized Conductance in One-dimensional Topological Systems

• URL: http://arxiv.org/abs/2508.07398v1
• Date: Sun, 10 Aug 2025 15:57:32 GMT
• Title: Dissipation-induced Half Quantized Conductance in One-dimensional Topological Systems
• Authors: Bozhen Zhou, Pan Zhang, Yucheng Wang, Chao Yang,
• Abstract summary: Quantized conductance from edge states is a hallmark of two-dimensional topological phases.<n>In one-dimensional (1D) topological systems, edge states cannot transmit current across the insulating bulk, rendering their topological nature invisible in transport.<n>We show that the conductance can become half-quantized in the topologically nontrivial phase, a feature absent in the trivial phase.
• Score: 14.310713564386523
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantized conductance from topologically protected edge states is a hallmark of two-dimensional topological phases. In contrast, edge states in one-dimensional (1D) topological systems cannot transmit current across the insulating bulk, rendering their topological nature invisible in transport. In this work, we investigate the transport properties of the Su-Schrieffer-Heeger model with gain and loss, and show that the zero-energy conductance exhibits qualitatively distinct behaviors between the topologically trivial and nontrivial phases, depending on the hybridization and dissipation strengths. Crucially, we analytically demonstrate that the conductance can become half-quantized in the topologically nontrivial phase, a feature absent in the trivial phase. We further show that the half quantization predominantly originates from transport channels involving gain/loss and edge states. Our results uncover a new mechanism for realizing quantized transport in 1D topological systems and highlight the nontrivial role of dissipation in enabling topological signatures in open quantum systems.

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