Boundary Floquet Control of Bulk non-Hermitian Systems

Quantum Physics [Submitted on 23 Mar 2026] Boundary Floquet Control of Bulk non-Hermitian Systems Yu-Min Hu, Yu-Bo Shi, Linhu Li, Gianluca Teza, Ching Hua Lee, Roderich Moessner, Shu Zhang, Sen Mu Non-Hermitian systems provide a powerful platform for engineering and controlling nonequilibrium phenomena beyond Hermitian settings, with the presence of non-Hermitian skin effect broadening the scope of dynamical control. Here, we develop a general theory of non-Hermitian systems driven exclusively at their boundaries, providing a unified description of the driving-frequency dependence of bulk spectra and dynamics in the thermodynamic limit. Our framework extends non-Bloch band theory to time-periodic systems at arbitrary boundary driving frequencies. Applying it to representative models, we demonstrate boundary-driving-induced parity-time symmetry breaking, with the driving frequency serving as a control knob and the driving amplitude providing an additional handle in finite-size systems. These results establish boundary Floquet driving as a versatile mechanism for controlling bulk properties of non-Hermitian systems and open new routes for dynamical engineering in driven open systems. Comments: 3+7 figures, 8+10 pages Subjects: Quantum Physics (quant-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Quantum Gases (cond-mat.quant-gas); Optics (physics.optics) Cite as: arXiv:2603.22396 [quant-ph]   (or arXiv:2603.22396v1 [quant-ph] for this version)   https://doi.org/10.48550/arXiv.2603.22396 Focus to learn more Submission history From: Yu-Min Hu [view email] [v1] Mon, 23 Mar 2026 18:00:10 UTC (4,075 KB) Access Paper: HTML (experimental) view license Current browse context: quant-ph < prev   |   next > new | recent | 2026-03 Change to browse by: cond-mat cond-mat.mes-hall cond-mat.quant-gas physics physics.optics References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar Export BibTeX Citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Demos Related Papers About arXivLabs Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)