Mark S. Rudner

Sep 27, 2024 | link.aps.org | Ying Xiong |Nanyang Technological |Mark S. Rudner

Screening is a ubiquitous phenomenon through which the polarization of bound or mobile charges tends to reduce the strengths of electric fields inside materials. Here, we show how photoexcitation can be used as a knob to transform conventional out-of-plane screening into antiscreening—the amplification of electric fields–in multilayer graphene.

Aug 26, 2024 | link.aps.org | Ruoyu ZHANG |Frederik Nathan |Netanel H. Lindner |Mark S. Rudner

Due to photon-assisted transport processes, chiral edge modes induced by periodic driving do not directly mediate quantized transport. Here we show how narrow-bandwidth “energy filters” can restore quantization by suppressing photon-assisted transport through Floquet sidebands. We derive a Floquet-Landauer-type equation to describe transport through such an energy-filtered setup, and show how the filter can be integrated out to yield a sharply energy-dependent renormalized system-lead coupling.

May 20, 2024 | link.aps.org | Frederik Nathan |Mark S. Rudner

We show that steady-state expectation values predicted by the universal Lindblad equation (ULE) are accurate up to bounded corrections that scale linearly with the effective system-bath coupling Γ (second order in the microscopic coupling).