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PRODID:-//Dirac Materials - ECPv4.9.6//NONSGML v1.0//EN
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METHOD:PUBLISH
X-WR-CALNAME:Dirac Materials
X-ORIGINAL-URL:http://diracmaterials.org
X-WR-CALDESC:Events for Dirac Materials
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TZID:"Europe/Stockholm"
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TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20190331T010000
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TZOFFSETFROM:+0200
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TZNAME:CET
DTSTART:20191027T010000
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DTSTART;TZID="Europe/Stockholm":20190212T150000
DTEND;TZID="Europe/Stockholm":20190212T161500
DTSTAMP:20260404T221044
CREATED:20190205T194233Z
LAST-MODIFIED:20190205T200350Z
UID:839-1549983600-1549988100@diracmaterials.org
SUMMARY:Group Meeting
DESCRIPTION:\nPresentation by Valera Kozin\, a visiting PhD student (profile here)\n\nTitle: “Multiply-connected nanostructures in the regime of strong light-matter coupling. Self-organizing maps as a method for detecting phase transitions”. \nAbstract:\nIt is demonstrated that the dressing field drastically modifies all electronic characteristics of the quantum rings\, including spin-orbit coupling\, effective electron mass\, and optical response. \nThe Chern insulator phase is shown to emerge in two-dimensional arrays of polariton rings where the time-reversal symmetry is broken due to the application of an out-of-plane magnetic field. \nWe employ a specific unsupervised machine learning technique—self-organizing maps—to create a low-dimensional representation of microscopic states\, relevant for macroscopic phase identification and detecting phase transitions. We explore the properties of spin Hamiltonians of two archetype model systems: a two-dimensional Heisenberg ferromagnet and a three-dimensional crystal\, Fe in the body-centered-cubic structure. The method of self-organizing maps\, which is known to conserve connectivity of the initial dataset\, is compared to the cumulant method theory and is shown to be as accurate while being computationally more efficient in determining a phase transition temperature. \n\nSlot for APS March Meeting still available.  Contact David for booking.\n\n
URL:http://diracmaterials.org/calendar2/group-meeting-2/
LOCATION:NORDITA // South  (Meeting Room 112.006B)\, Roslagstullsbacken 23\, Stockholm\, 106 91\, Sweden
CATEGORIES:Group Meetings
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