Still the one one direction download skin#
Their non-triviality and richness is also apparent in the context of applications: this simultaneous interplay of the skin effect and higher-order topology has been proposed to be used as a topological switch 23. Characterized by scenarios where topological localization dynamically allows the non-Hermitian skin effect to act only on certain topological modes, they greatly augment the richness of higher-dimensional robustness beyond higher-order topological phenomena, and provokes the re-formulation of higher-order topological bulk-boundary correspondence to accommodate various avenues of higher-order skin and topological interplay 21, 22. 20, hybrid skin-topological states represent a hierarchy of higher-dimensional states without analogs in Hermitian or non-topological settings. While skin and topological effects are already by themselves conceptually deep, with contrasting implications on the bulk-boundary correspondence, their simultaneous nontrivial interplay has been particularly intriguing. More recently, they aroused much attention again as non-Hermitian skin states, which demonstrated how unbalanced non-Hermitian gain/loss can challenge well-held tenets of bulk-boundary correspondence 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19. Originally formulated in the context of anomalies, they revolutionized the field of condensed matter physics in the form of topological insulators and semimetals 1, 2, 3. Much of contemporary condensed matter physics has been dominated by theoretical and experimental investigations into robust boundary phenomena. Realized through our highly versatile and scalable circuit platform, theses states have no Hermitian nor lower-dimensional analog, and pave the way for applications in topological switching and sensing through the simultaneous non-trivial interplay of skin and topological boundary localizations.
Our experiments, which are performed on specially designed non-reciprocal 2D and 3D topolectrical circuit lattices, showcases how non-reciprocal pumping and topological localization dynamically interplays to form various states like 2D skin-topological, 3D skin-topological-topological hybrid states, as well as 2D and 3D higher-order non-Hermitian skin states. In this work, we report the experimental realizations of hybrid higher-order skin-topological effect, in which the skin effect selectively acts only on the topological boundary modes, not the bulk modes.
Of late, much attention has focused on two distinct mechanisms for boundary robustness-topological protection, as well as the non-Hermitian skin effect. JNU-204 is an exemplary MOF platform with good photon absorption, suitable band gap, fast charge separation, and extraordinary chemical stability for proceeding with aerobic oxidation reactions under visible-light irradiation.Robust boundary states epitomize how deep physics can give rise to concrete experimental signatures with technological promise. Furthermore, we illustrate its applications in the facile synthesis of pyrroloisoquinoline-containing heterocycles, core skeletons of a family of marine natural products. Recycling experiments were conducted to demonstrate the stability and reusability of JNU-204 as a robust heterogeneous photocatalyst. Under visible-light irradiation, three aerobic oxidation reactions involving different oxygenation pathways were achieved on JNU-204.
Further attempts to integrate such a photosensitizer into MOFs afford a more effective heterogeneous photocatalyst (JNU-204). Herein, we report the design of a pyrazole–benzothiadiazole–pyrazole organic molecule bearing a donor–acceptor–donor conjugated π-system for fast charge separation. Metal–organic frameworks (MOFs) are emerging as promising candidates for heterogeneous photocatalysis due to their structural designability and tunability of photon absorption. Charge separation plays a crucial role in regulating photochemical properties and therefore warrants consideration in designing photocatalysts.
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