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BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Penn Engineering Events - ECPv6.18.0//NONSGML v1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH X-WR-CALNAME:Penn Engineering Events X-ORIGINAL-URL:https://seasevents.nmsdev7.com X-WR-CALDESC:Events for Penn Engineering Events REFRESH-INTERVAL;VALUE=DURATION:PT1H X-Robots-Tag:noindex X-PUBLISHED-TTL:PT1H BEGIN:VTIMEZONE TZID:America/New_York BEGIN:DAYLIGHT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:EDT DTSTART:20190310T070000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0400 TZOFFSETTO:-0500 TZNAME:EST DTSTART:20191103T060000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:EDT DTSTART:20200308T070000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0400 TZOFFSETTO:-0500 TZNAME:EST DTSTART:20201101T060000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:-0500 TZOFFSETTO:-0400 TZNAME:EDT DTSTART:20210314T070000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0400 TZOFFSETTO:-0500 TZNAME:EST DTSTART:20211107T060000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;TZID=America/New_York:20200910T104500 DTEND;TZID=America/New_York:20200910T114500 DTSTAMP:20200828T144515Z CREATED:20200828T144515Z LAST-MODIFIED:20200828T144515Z UID:3205-1599734700-1599738300@seasevents.nmsdev7.com SUMMARY:MSE Seminar: "Approaching the Intrinsic Limit in Transition Metal Dichalcogenide van der Waals Heterostructures" DESCRIPTION:Studying the intrinsic behavior 2D materials requires attention to both external and internal sources of disorder. This talk will first review the techniques used to create clean heterostructures with hBN to reduce environmental disorder. In graphene\, ten years of progress has led to device performance now rivaling he highest-quality GaAs-based heterostructures. On the other hand\, semiconducting transition metal dichalcogenides (TMDs) are also limited by atomic defects within the crystalline layers\, which requires efforts in synthesis and characterization of high purity crystals. This talk will present recent progress in synthesis of TMD crystals with dramatically lower defect density using a self-flux technique. Combining higher crystal quality and clean encapsulation allows observation of greatly enhanced optical properties\, including near-unity photoluminescence quantum yield\, and long excited-state lifetime in TMD heterostructures. In addition\, electronic transport measurements show improved carrier mobility and reveal many new details in magnetotransport measurements\, including observation of fractional quantum Hall states in monolayer TMDs. These high-quality crystals also allow studies of twisted bilayer TMDs\, which show the emergence of many-body correlated states. \nPlease register in advance for this seminar here. URL:https://seasevents.nmsdev7.com/event/mse-seminar-approaching-the-intrinsic-limit-in-transition-metal-dichalcogenide-van-der-waals-heterostructures/ ORGANIZER;CN="Materials Science and Engineering":MAILTO:johnruss@seas.upenn.edu END:VEVENT END:VCALENDAR