{"id":6457,"date":"2026-10-19T09:48:56","date_gmt":"2026-10-19T09:48:56","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-efnafraedi-ivan-tambovtsev\/"},"modified":"2026-10-19T09:48:56","modified_gmt":"2026-10-19T09:48:56","slug":"doktorsvorn-i-efnafraedi-ivan-tambovtsev","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-efnafraedi-ivan-tambovtsev\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed efnafr\u00e6\u00f0i – Ivan Tambovtsev"},"content":{"rendered":"
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Doktorsefni: <\/strong>Ivan Tambovtsev<\/p>\n

Heiti ritger\u00f0ar: <\/strong>Sameindav\u00e9lar og Hendin Efni (Molecular Motors and Chiral Media)<\/p>\n

Andm\u00e6lendur:
<\/strong>Dr. G\u00edsli H\u00f3lmar J\u00f3hannesson, efna- og st\u00e6r\u00f0fr\u00e6\u00f0ikennari vi\u00f0 Keili
Dr. Karl-Heinz Ernst, pr\u00f3fessor vi\u00f0 University of Zurich og EMPA, Sviss<\/p>\n

Lei\u00f0beinandi: <\/strong>Dr. Hannes J\u00f3nsson, pr\u00f3fessor vi\u00f0 Raunv\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands<\/p>\n

Einnig \u00ed doktorsnefnd:
<\/strong>Dr. Elvar \u00d6rn J\u00f3nsson, ranns\u00f3knad\u00f3sent vi\u00f0 Raunv\u00edsindastofnun H\u00e1sk\u00f3lans
Dr. Sergei Egorov, pr\u00f3fessor vi\u00f0 University of Virginia, Bandar\u00edkjunum
Dr. Tetiana Orlova, a\u00f0alranns\u00f3knarma\u00f0ur vi\u00f0 E\u00f0lisfr\u00e6\u00f0istofnun H\u00e1sk\u00f3lans \u00ed Jerevan, Armen\u00edu
Dr. Gianluca Levi, d\u00f3sent vi\u00f0 University of Trieste \u00e1 \u00cdtal\u00edu og a\u00f0junkt vi\u00f0 Raunv\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands<\/p>\n

Doktorsv\u00f6rn st\u00fdrir: <\/strong>Dr. Benjam\u00edn R. Sveinbj\u00f6rnsson, d\u00f3sent og varadeildarforseti Raunv\u00edsindadeildar H\u00e1sk\u00f3la \u00cdslands<\/p>\n

\u00c1grip<\/strong><\/p>\n

Lj\u00f3sdrifnar sameindav\u00e9lar af annarri kynsl\u00f3\u00f0 bj\u00f3\u00f0a upp \u00e1 lei\u00f0 til st\u00fdra hreyfingu og orkuflutningum \u00e1 nan\u00f3skala. \u00cd \u00feessari ritger\u00f0 er rafeindabygging sl\u00edkra sameinda reiknu\u00f0 til a\u00f0 magngreina og stilla lj\u00f3sgleypni og sn\u00faningshra\u00f0a \u00feeirra.<\/p>\n

Lj\u00f3sgley\u00f0nin sem kemur sn\u00faningnum af sta\u00f0 er reiknu\u00f0 me\u00f0 t\u00edmah\u00e1\u00f0ri \u00fe\u00e9ttnifellafr\u00e6\u00f0i (TDDFT), og varmadrifnu skrefin sem \u00e1kvar\u00f0a heildart\u00edmaskala sn\u00faningsins reiknu\u00f0 me\u00f0 virkjunar\u00e1standsa\u00f0fer\u00f0inni. Einnig eru takmarkanir hef\u00f0bundinnar t\u00edmah\u00e1\u00f0rar \u00fe\u00e9ttnifellafr\u00e6\u00f0i metnar fyrir fl\u00farlj\u00f3mandi sameindav\u00e9lar og \u00fear er t\u00edma\u00f3h\u00e1\u00f0, svigr\u00famabestu\u00f0 a\u00f0fer\u00f0 pr\u00f3fu\u00f0 til a\u00f0 f\u00e1 betri l\u00fdsingu \u00e1 \u00f6rvunum sem fela \u00ed s\u00e9r rafeindaflutning. L\u00e1gmarksorkulei\u00f0ir eru fundnar me\u00f0 \u00fe\u00e9ttnifellafr\u00e6\u00f0i og klifurmyndar hnykktu teygjubandsa\u00f0fer\u00f0inni (CI-NEB), og hra\u00f0afastar eru metnir me\u00f0 kj\u00f6rsveifilsn\u00e1lgunum.<\/p>\n

Bent er \u00e1 m\u00f6guleika til a\u00f0 b\u00e6ta eiginleikar sameindav\u00e9la me\u00f0 \u00fev\u00ed a\u00f0 skipta \u00fat at\u00f3mum og h\u00f3pum at\u00f3ma. \u00deegar met\u00fdlh\u00f3pnum vi\u00f0 handhverfumi\u00f0juna er skipt \u00fat fyrir fyrirfer\u00f0armeiri og rafeindadr\u00e6gari skiptih\u00f3pum, svo sem tr\u00edfl\u00faormet\u00fdl, tr\u00edkl\u00f3rmet\u00fdl, tert-b\u00fat\u00fdl e\u00f0a alfl\u00faora\u00f0an tert-b\u00fat\u00fdl, eykst sn\u00faningshra\u00f0inn undantekningalaust og \u00ed flestum tilfellum ver\u00f0ur litr\u00f3fsa\u00f0skilna\u00f0ur milli st\u00f6\u00f0ugra og h\u00e1lfst\u00f6\u00f0ugra \u00e1standa meiri, sem b\u00e6tir s\u00e9rt\u00e6ka lj\u00f3s\u00f6rvun. Aftur \u00e1 m\u00f3ti, ef vetni vi\u00f0 handhverfumi\u00f0juna er skipt \u00fat fyrir fl\u00faor e\u00f0a kl\u00f3r h\u00e6gir \u00e1 sn\u00faningnum, litr\u00f3fsbili\u00f0 minnkar og hvarfkerfi\u00f0 getur jafnvel breyst me\u00f0 \u00fev\u00ed a\u00f0 bakhvarfi\u00f0 ver\u00f0ur r\u00edkjandi. \u00cd \u00f6llum kerfunum sem ranns\u00f6ku\u00f0 voru st\u00fdra breytingar \u00e1 orku\u00fer\u00f6skuldinum hra\u00f0afr\u00e6\u00f0inni \u00e1 me\u00f0an breytingar \u00e1 forli\u00f0num hafa l\u00edtl \u00e1hrif.<\/p>\n

Me\u00f0 \u00feessum ni\u00f0urst\u00f6\u00f0um er h\u00e6gt a\u00f0 setja fram einfaldar efnafr\u00e6\u00f0ilegar reglur til a\u00f0 stj\u00f3rna t\u00edmaskala og litr\u00f3fseiginleikum sameindav\u00e9la me\u00f0 markvissum skiptingum \u00e1 at\u00f3mh\u00f3pum. \u00deannig er h\u00e6gt a\u00f0 lei\u00f0beina vi\u00f0 h\u00f6nnun \u00e1 vi\u00f0brag\u00f0sn\u00e6mum efnum, \u00fear me\u00f0 tali\u00f0 k\u00f3lester\u00edskum flj\u00f3tandi krist\u00f6llum me\u00f0 \u00edb\u00f3tarveilum, \u00fear sem sameindav\u00e9lar eru nota\u00f0ar til a\u00f0 n\u00e1 fram lj\u00f3sst\u00fdr\u00f0ri virkjun og flutningi \u00e1 handhverfri \u00e1fer\u00f0 er stj\u00f3rnast af kr\u00f6ftum milli einbylgja (solitons). Hi\u00f0 sam\u00fe\u00e6tta verkfl\u00e6\u00f0i fr\u00e1 \u00fe\u00e9ttnifellafr\u00e6\u00f0i a\u00f0 l\u00e1gmarksorkuferlum og virkjunar\u00e1standsa\u00f0fer\u00f0 innan kj\u00f6rsveiflisn\u00e1lgunarinnar b\u00fd\u00f0ur upp \u00e1 skilvirka lei\u00f0 til a\u00f0 sp\u00e1 fyrir um og h\u00e1marka afk\u00f6st sameindav\u00e9la vi\u00f0 hinar \u00fdmsu a\u00f0st\u00e6\u00f0ur.<\/p>\n

Um doktorsefni\u00f0<\/strong><\/p>\n

Ivan Tambovtsev lauk B.Sc. og M.Sc. pr\u00f3fum \u00ed e\u00f0lisfr\u00e6\u00f0i fr\u00e1 r\u00edkish\u00e1sk\u00f3lanum \u00ed Sankti P\u00e9tursborg, \u00fear sem hann vann a\u00f0 ranns\u00f3knum \u00ed kennilegri e\u00f0lisfr\u00e6\u00f0i og reiknil\u00edkanger\u00f0.
Hann h\u00f3f doktorsn\u00e1m vi\u00f0 Raunv\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands \u00e1ri\u00f0 2022.
Ranns\u00f3knir hans fjalla um sameindav\u00e9lar, skautu\u00f0 kerfi og \u00fdmis nan\u00f3kerfi, og \u00fe\u00e6r hafa veri\u00f0 ger\u00f0ar undir lei\u00f0s\u00f6gn Hannesar J\u00f3nssonar pr\u00f3fessors.<\/p>\n<\/div><\/div>","protected":false},"featured_media":5875,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_phd_date_start":"2025-12-22T14:00:00+00:00","_phd_date_end":"2025-12-22T16:00:00+00:00","_phd_location":"Askja Stofa 132","_phd_admission":"A\u00f0gangur \u00f3keypis","_phd_thesis_title":"Sameindav\u00e9lar og Hendin Efni (Molecular Motors and Chiral Media)","_phd_source_url":"https:\/\/gamli.hi.is\/vidburdir\/doktorsvorn_i_efnafraedi_ivan_tambovtsev","_phd_source_node_id":"443016","_phd_source_type":"vidburdir","_phd_member_id":999,"footnotes":""},"phd_school":[101,93],"phd_discipline":[102],"class_list":["post-6457","phd_defence","type-phd_defence","status-publish","has-post-thumbnail","hentry","phd_school-raunvisindadeild","phd_school-verkfraedi-og-natturuvisindasvid","phd_discipline-phd-i-efnafraedi"],"_links":{"self":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6457","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence"}],"about":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/types\/phd_defence"}],"version-history":[{"count":0,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6457\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media\/5875"}],"wp:attachment":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media?parent=6457"}],"wp:term":[{"taxonomy":"phd_school","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_school?post=6457"},{"taxonomy":"phd_discipline","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_discipline?post=6457"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}