{"id":834,"date":"2020-06-11T11:10:13","date_gmt":"2020-06-11T05:40:13","guid":{"rendered":"http:\/\/www.potentialloops.org\/?p=834"},"modified":"2020-06-11T11:10:14","modified_gmt":"2020-06-11T05:40:14","slug":"first-confirmation-of-new-theory-by-metamaterial","status":"publish","type":"post","link":"https:\/\/www.potentialloops.org\/?p=834","title":{"rendered":"First confirmation of new theory by metamaterial"},"content":{"rendered":"\n

Date: June 10, 2020 <\/p>\n\n\n\n

Source 1: University of W\u00fcrzburg <\/p>\n\n\n\n

Source 2: www.sciencedaily.com<\/p>\n\n\n\n

Summary: Physicists have experimentally demonstrated a novel effect for the first time by exploiting topological metamaterials. <\/p>\n\n\n\n

Topological metamaterials are applied as a \nnovel platform to explore and study extraordinary effects. Instead of \nusing natural materials, researchers artificially arrange the \nconstituents of a topological metamaterial in a regular structure. Such \nan arrangement is analogous to a solid state in which the atoms form a \ncrystal lattice. Usually, these platforms are used to simulate \nparticular properties of solids in order to make them amenable to \nexperimental investigation.<\/p>\n\n\n\n

Physicists at Julius-Maximilians-Universit\u00e4t (JMU) W\u00fcrzburg in \nBavaria, Germany, perform research on those topological metamaterials, a\n central scheme of the W\u00fcrzburg-Dresden Cluster of Excellence ct.qmat —\n Complexity and Topology in Quantum Matter.<\/p>\n\n\n\n

Novel topological phenomena<\/strong><\/p>\n\n\n\n

A related motif of solid state research in W\u00fcrzburg is the discovery \nand characterization of novel topological phenomena. This concerns the \nstudy of topological insulators, which are insulating in the bulk, but \nfeature conducting surface states. Scientists worldwide engage in \nintensive research on these materials as they exhibit compelling \nphysical phenomena. One day, this research may lead to advances in \nsemiconductor technology or in other fields.<\/p>\n\n\n\n

The JMU researchers report on their newest results in the journal Nature Physics<\/em>.\n Topological insulators are usually considered as isolated (Hermitian) \nsystems. In contrast, scientists can tweak topological metamaterials \nsuch as to study the implications of energy exchange with the \nenvironment. These interactions influence the behaviour of the system \nfrom the outside, as would be the case for friction. This way, they \nexperimentally verified the non-Hermitian skin effect (NHSE) previously \npredicted in theory.<\/p>\n\n\n\n

All states localize at the edge<\/strong><\/p>\n\n\n\n

The NHSE involves that, in contrast to a common topological \ninsulator, not only a small fraction but all states of the material \nappear at its edge, i.e. are localized there. This is described by \nTobias Helbig and Tobias Hofmann, the joint first authors of the \npublication. They are both PhD students in the research group of \nProfessor Ronny Thomale, head of the JMU Chair of Theoretical Physics I.<\/p>\n\n\n\n

“Our research shows, among other things, that the physical principles\n known from isolated solid state systems need to be fundamentally \nmodified in the non-Hermitian case,” the PhD students explain. The new \nfindings would not yet have a direct application. However, they do have \nthe potential to improve highly sensitive optical detectors, as an \nexample.<\/p>\n\n\n\n

Electric circuits as a center of innovation in basic research<\/p>\n\n\n\n

The experiments leading to the new results were conducted with the \ngroup of Dr. Tobias Kie\u00dfling and the JMU Chair of Experimental Physics \nIII. Additional contributions and ideas have been brought forward by \nProfessor Alexander Szameit from the University of Rostock. JMU \nPhysicists cooperate with Szameit’s team on the topic of topological \nphotonics within the cluster of excellence ct.qmat.<\/p>\n\n\n\n

In order to demonstrate the non-Hermitian skin effect experimentally,\n the JMU team has used electric circuits with periodically arranged \nelements. Due to their resemblance to the crystal structure of a solid, \nsuch artificially arranged experimental settings are classified as a \nmetamaterial.<\/p>\n\n\n\n

Applications of topological matter in sight<\/strong><\/p>\n\n\n\n

Prospectively, the research team wants to investigate the interplay \nbetween topological states and non-Hermitian physics further. One key \nquestion will be to which extent the topological protection of states \nremains intact when interactions with the environment are present.<\/p>\n\n\n\n

In the long term, the team intends to progress towards quantum hybrid\n circuits in which they plan to embed superconducting or other quantum \nmechanical circuit elements. Such circuits offer a versatile platform \nfor the discovery of novel phenomena.<\/p>\n\n\n\n

“We aim to transfer the insights from topological circuits to other \nmetamaterial platforms in the pursuit of potential applications,” \nProfessor Thomale sums up. This includes optical setups such as photonic\n waveguides. There, topologically protected states in non-Hermitian \nsystems could prove relevant in the enhancement of signal processing and\n detectors as well as in the construction of a photonic quantum \ncomputer. Eventually, the ultimate scheme in the research on topological\n metamaterials is the reconnection of novel effects to actual solid \nstates.<\/p>\n\n\n\n

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Story Source:<\/strong><\/p>\n\n\n\n

Materials<\/a> provided by University of W\u00fcrzburg<\/strong><\/a>. Note: Content may be edited for style and length.<\/em><\/p>\n\n\n\n

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Journal Reference<\/strong>:<\/p>\n\n\n\n

  1. T. Helbig, T. Hofmann, S. Imhof, M. Abdelghany, T. Kiessling, L. W. Molenkamp, C. H. Lee, A. Szameit, M. Greiter, R. Thomale. Generalized bulk\u2013boundary correspondence in non-Hermitian topolectrical circuits<\/strong>. Nature Physics<\/em>, 2020; DOI: 10.1038\/s41567-020-0922-9<\/a>\n<\/li><\/ol>\n\n\n\n
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