{"id":87661,"date":"2023-09-07T14:33:40","date_gmt":"2023-09-07T11:33:40","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=87661"},"modified":"2023-09-07T14:33:40","modified_gmt":"2023-09-07T11:33:40","slug":"demonul-lui-pines-a-fost-detectat-in-sfarsit-dupa-67-de-ani","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/demonul-lui-pines-a-fost-detectat-in-sfarsit-dupa-67-de-ani\/","title":{"rendered":"&#8222;Demonul lui Pines&#8221; a fost detectat, \u00een sf\u00e2r\u015fit, dup\u0103 67 de ani"},"content":{"rendered":"<p><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2023\/09\/demonul-lui-Pines.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-87662\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2023\/09\/demonul-lui-Pines.jpg\" alt=\"\" width=\"351\" height=\"257\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2023\/09\/demonul-lui-Pines.jpg 351w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2023\/09\/demonul-lui-Pines-300x220.jpg 300w\" sizes=\"auto, (max-width: 351px) 100vw, 351px\" \/><\/a>Timp de aproape 7 decenii, un plasmon cunoscut sub numele de demonul lui Pines a r\u0103mas o caracteristic\u0103 pur ipotetic\u0103 a sistemelor \u00een stare solid\u0103. F\u0103r\u0103 mas\u0103, neutr\u0103 \u0219i incapabil\u0103 de a interac\u021biona cu lumina, aceast\u0103 cvasiparticul\u0103 neobi\u0219nuit\u0103 este considerat\u0103 a juca un rol cheie \u00een anumi\u021bi supraconductori \u0219i semimetale. Acum, oamenii de \u0219tiin\u021b\u0103 din SUA \u0219i Japonia spun c\u0103 au detectat-o folosind o spectroscopie electronic\u0103 specializat\u0103 pentru a studia materialul rutenatului de stron\u021biu.<\/p>\n<p>Plasmonii au fost propu\u0219i de c\u0103tre fizicienii David Pines \u0219i David Bohm \u00een 1952 ca \u015fi cuante ale fluctua\u021biilor colective ale densit\u0103\u021bii electronilor \u00eentr-o plasm\u0103. Ei sunt analogi cu fononii, care sunt cuante de sunet, dar spre deosebire de fononi, frecven\u021ba lor nu tinde spre zero atunci c\u00e2nd nu au impuls. Acest lucru se datoreaz\u0103 faptului c\u0103 energia finit\u0103 este necesar\u0103 pentru a dep\u0103\u0219i atrac\u021bia coulombian\u0103 dintre electroni \u0219i ioni dintr-o plasm\u0103, pentru a declan\u0219a oscila\u021biile, ceea ce implic\u0103 o frecven\u021b\u0103 de oscila\u021bie finit\u0103 (la impuls zero).<\/p>\n<p>Ast\u0103zi, plasmonii sunt studia\u021bi \u00een mod obi\u0219nuit \u00een metale \u0219i semiconductori, care au electroni de conducere ce se comport\u0103 ca o plasm\u0103. Plasmonii, fononii \u0219i alte fluctua\u021bii cuantificate sunt numite cvasiparticule deoarece au propriet\u0103\u021bi \u00een comun cu particulele fundamentale, cum ar fi fotonii.<\/p>\n<p>\u00cen 1956, Pines a emis ipoteza existen\u021bei unui plasmon care, ca \u0219i sunetul, nu ar necesita nicio explozie ini\u021bial\u0103 de energie. El a numit noua cvasiparticul\u0103 un demon \u00een onoarea faimosului demon termodinamic al lui James Clerk Maxwell. Demonul lui Pines se formeaz\u0103 atunci c\u00e2nd electronii din diferite benzi ale unui metal se defazeaz\u0103 unul fa\u021b\u0103 de cel\u0103lalt, astfel \u00eenc\u00e2t s\u0103 men\u021bin\u0103 \u00eenc\u0103rc\u0103tura general\u0103 static\u0103. De fapt, un demon este mi\u0219carea colectiv\u0103 a cvasiparticulelor neutre a c\u0103ror sarcin\u0103 este ecranat\u0103 de electroni dintr-o alt\u0103 band\u0103.<\/p>\n<p>Cu toate acestea, aceast\u0103 predic\u021bie de lung\u0103 durat\u0103 a fost greu de confirmat experimental. Cu cei doi curen\u021bi de electroni defaza\u021bi unul fa\u021b\u0103 de cel\u0103lalt, ace\u0219tia anuleaz\u0103 \u0219i elimin\u0103 interac\u021biunile Coulomb cu raz\u0103 lung\u0103. Acest lucru exclude orice semn\u0103tur\u0103 a demonului \u00een propriet\u0103\u021bile dielectrice ale metalului, ceea ce \u00eenseamn\u0103 c\u0103 cvasiparticula nu interac\u021bioneaz\u0103 cu lumina.<\/p>\n<p>Acum, Peter Abbamonte de la Universitatea din Illinois Urbana-Champaign (UIUC) din SUA \u0219i colegii s\u0103i au demonstrat cum aceast\u0103 dificultate poate fi dep\u0103\u0219it\u0103 folosind o tehnic\u0103 non-standard pentru a studia rutenatul metalic de stron\u021biu. Dup\u0103 cum explic\u0103 \u00eentr-un comunicat de pres\u0103, ei \u0219i-au f\u0103cut descoperirea \u00eent\u00e2mpl\u0103tor. \u00cen loc s\u0103 caute demonul lui Pines, ei explorau \u00een schimb propriet\u0103\u021bile electronice ale rutenatului de stron\u021biu pentru a folosi materialul ca un fel de surogat pentru supraconductorii de temperatur\u0103 \u00eenalt\u0103 \u2013 care au propriet\u0103\u021bi similare.<\/p>\n<p>Tehnica pe care au folosit-o este cunoscut\u0103 sub numele de spectroscopie de pierdere de energie a electronilor. Tehnica este potrivit\u0103 pentru studiul plasmonilor, deoarece electronii sunt foarte sensibili la fluctua\u021biile densit\u0103\u021bii de sarcin\u0103.<\/p>\n<p>Folosind cristale unice de rutenat de stron\u021biu de dimensiuni milimetrice cultivate de Yoshiteru Maeno \u0219i colegii de la Universitatea Kyoto din Japonia, cercet\u0103torii au \u00eenregistrat spectre destul de diferite folosind electroni de energie joas\u0103 \u0219i \u00eenalt\u0103. \u00cen acest ultim caz, ei au descoperit c\u0103 pierderea de energie atinge un v\u00e2rf de aproximativ 1,2 eV, pe care o identific\u0103 ca o interac\u021biune cu un plasmon tipic (\u00eenc\u0103rcat). Pe de alt\u0103 parte, la energii mai mici, ei au observat o oscila\u021bie cu un mic decalaj energetic &#8211; mai pu\u021bin de 8 meV &#8211; la impuls zero.<\/p>\n<p>Aceast\u0103 a doua caracteristic\u0103, spun ei, este un mod acustic cu o vitez\u0103 de aproximativ 100 de ori mai mare dec\u00e2t cea a sunetului, care este mult prea mare pentru a fi asociat cu fononi. \u00cen acela\u0219i timp, totu\u0219i, viteza modului este cu aproximativ trei ordine de m\u0103rime mai mic\u0103 dec\u00e2t cea a unui plasmon de suprafa\u021b\u0103. Cu toate acestea, cifra se afl\u0103 la 10% din cea prezis\u0103 de teoreticianul UIUC Edwin Huang pentru o cvasiparticul\u0103 format\u0103 din dou\u0103 benzi de electroni \u00een rutenat de stron\u021biu care oscileaz\u0103 defazat unul cu cel\u0103lalt \u2013 un demon al lui Pines.<\/p>\n<p>Cercet\u0103torii sus\u021bin c\u0103 demonul ar putea fi mai bine \u00een\u021beles prin realizarea de experimente suplimentare cu un microscop electronic cu transmisie de scanare \u0219i, de asemenea, prin dezvoltarea unei teorii hidrodinamice a cvasiparticulei. Dar astfel de studii nu trebuie s\u0103 se limiteze la rutenatul de stron\u021biu, demonul trebuind s\u0103 fie prezent \u00een alte metale cu benzi de electroni suficient de diferite &#8211; inclusiv unii supraconductori, cum ar fi diborura de magneziu sau cei pe baz\u0103 de fier.<\/p>\n<p><strong>Sursa<\/strong> (traducerea \u015fi adaptarea proprie): studiul \u015ftiin\u0163ific <a href=\"https:\/\/www.nature.com\/articles\/s41586-023-06318-8\" target=\"_blank\" rel=\"noopener\"><strong>&#8222;Pines\u2019 demon observed as a 3D acoustic plasmon in Sr<sub>2<\/sub>RuO<sub>4 <\/sub>&#8221; \/ nature.com <\/strong><\/a><sub><br \/>\n<\/sub><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Timp de aproape 7 decenii, un plasmon cunoscut sub numele de demonul lui Pines a r\u0103mas o caracteristic\u0103 pur ipotetic\u0103 a sistemelor \u00een stare solid\u0103. F\u0103r\u0103 mas\u0103, neutr\u0103 \u0219i incapabil\u0103 de a interac\u021biona cu lumina, aceast\u0103 cvasiparticul\u0103 neobi\u0219nuit\u0103 este considerat\u0103 &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"&#8222;Demonul lui Pines&#8221; a fost detectat, \u00een sf\u00e2r\u015fit, dup\u0103 67 de ani\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/demonul-lui-pines-a-fost-detectat-in-sfarsit-dupa-67-de-ani\/#more-87661\" aria-label=\"Cite\u0219te mai multe despre &#8222;Demonul lui Pines&#8221; a fost detectat, \u00een sf\u00e2r\u015fit, dup\u0103 67 de ani\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":87662,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11042],"tags":[3052,3407,18487,347,66,11043,2048,18488,7189,128,12493,952,14694,3050,660,18486,11927,23,4101,2358,2250,1840],"class_list":["post-87661","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fizica-chimie","tag-bohm","tag-demon","tag-demonul-lui-pines","tag-electroni","tag-energie","tag-fizica-chimie","tag-fizician","tag-fononi","tag-ioni","tag-japonia","tag-kyoto","tag-lumina","tag-microscop-electronic","tag-particula","tag-plasma","tag-plasmon","tag-strontiu","tag-sua","tag-sunet","tag-temperatura","tag-universitate","tag-viteza","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>&quot;Demonul lui Pines&quot; a fost detectat, \u00een sf\u00e2r\u015fit, dup\u0103 67 de ani - Secretele lui Lovendal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.lovendal.ro\/wp52\/demonul-lui-pines-a-fost-detectat-in-sfarsit-dupa-67-de-ani\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"&quot;Demonul lui Pines&quot; a fost detectat, \u00een sf\u00e2r\u015fit, dup\u0103 67 de ani\" \/>\n<meta property=\"og:description\" content=\"Timp de aproape 7 decenii, un plasmon cunoscut sub numele de demonul lui Pines a r\u0103mas o caracteristic\u0103 pur ipotetic\u0103 a sistemelor \u00een stare solid\u0103. 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F\u0103r\u0103 mas\u0103, neutr\u0103 \u0219i incapabil\u0103 de a interac\u021biona cu lumina, aceast\u0103 cvasiparticul\u0103 neobi\u0219nuit\u0103 este considerat\u0103 ... 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