BEGIN:VCALENDAR METHOD:REQUEST PRODID:Microsoft Exchange Server 2010 VERSION:2.0 BEGIN:VTIMEZONE TZID:W. Europe Standard Time BEGIN:STANDARD DTSTART:16010101T030000 TZOFFSETFROM:+0200 TZOFFSETTO:+0100 RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=-1SU;BYMONTH=10 END:STANDARD BEGIN:DAYLIGHT DTSTART:16010101T020000 TZOFFSETFROM:+0100 TZOFFSETTO:+0200 RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=-1SU;BYMONTH=3 END:DAYLIGHT END:VTIMEZONE BEGIN:VEVENT ORGANIZER;CN=Beta NAT Secretariaat:mailto:natsecr.beta@vu.nl ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN=_list_seni or-staff-physics-and-astronomy:mailto:senior-staff-physics-and-astronomy@l istserver.vu.nl ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN=nataio.few @listserver.vu.nl:mailto:nataio.few@listserver.vu.nl ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN=_list_temp s.few:mailto:temps.few@listserver.vu.nl ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN=Beta OBP N at:mailto:obp.nat.beta@vu.nl DESCRIPTION;LANGUAGE=en-US:\n\nFrom: Beta NAT Secretariaat natsecr.beta@vu. nl\nSent: Thursday\, 4 June 2026 10:01\nTo: _li st_senior-staff-physics-and-astronomy senior-staff-physics-and-astronomy@l istserver.vu.nl\; _list_temps.few temps.few@listserver.vu.nl\; nataio.few@listserver.vu.nl\ ; Beta OBP Nat obp.nat.beta@vu.nl\nCc: Beta NAT Secretariaat natsecr.beta@vu.nl\nSubject: Anno uncement for a seminar by dr. Hai Wang (UU) on June 18 - 13.30 In Spectrum 5\nDear all\,\nWe have a visitor coming to the PCM section in a couple of weeks and he will be giving a talk that may be of interest to many within the department.\nBest wishes\,\nAndrea\n\nAnnouncement: Seminar by dr. Ha i Wang (UU)\n\nDate: Thursday\, June 18\, 2026\nTime: 13:30 - 14:30\nPlace : Spectrum 5\, VU Amsterdam\n\nTitle\nUltrafast Snapshots of Charge and En ergy Dynamics in Low-Dimensional Materials Using THz Spectroscopy\n\nSpeak er\nHai Wang\nDebye Institute for Nanomaterials Science\, Utrecht Universi ty\, Utrecht\, the Netherlands\nMax Planck Institute for Polymer Research\ , Mainz\, Germany\n\nAbstract\nThe conversion of light into electrical cur rent underpins varied technologies such as photovoltaics and photodetector s. Understanding how charge carriers are generated and transported in the ultrafast (e.g from ps to ns time scale) is critical\, as these processes determine recombination pathways\, energy losses\, and ultimately device p erformance. Layered two-dimensional (2D) materials have emerged as promisi ng platforms for next-generation optoelectronic devices. Since the discove ry of graphene\, the family of 2D materials has expanded rapidly to encomp ass a wide range of electronic phases\, including metallic systems (e.g.\, graphene\, MXenes)\, semiconductors (e.g.\, transition metal dichalcogeni des)\, and insulators (e.g.\, hexagonal boron nitride). Their reduced dime nsionality and strong many-body interactions provide an ideal setting for investigating ultrafast charge-carrier and energy flow dynamics in nonequi librium regimes. In this talk\, I will first introduce the fundamentals of ultrafast terahertz (THz) spectroscopy and highlight its power as a conta ct-free probe of charge transport properties¹ and low-energy excitations ² in low-dimensional materials. I will then present two recent studies: o ne exploring the ultrafast generation of free carriers in strongly exciton ic systems through hot-carrier-assisted exciton dissociation³\, and anoth er investigating strong photothermal transport in 2D metallic MXenes with markedly slow thermal energy dissipation⁴. Together\, these examples dem onstrate how ultrafast THz spectroscopy provides unique insight into the f undamental processes in low-dimensional quantum materials. Our work furthe r reveals the pivotal role of many-body (e.g. carrier-carrier and carrier- phonon) interactions in dictating ultrafast charge and energy follow dynam ics in nanomaterials for light harvesting and sensing applications.\n\nRef erences\n1. Wenhao Zheng et al.\, Band Transport by Large Fröhlich Polaro ns in MXenes\, Nature Physics 2022\, 18\, 544-550.\n2. Alexander Tries et al.\, Experimental Observation of Strong Exciton Effects in Graphene Nanor ibbons\, Nano Letters 2020\, 20\, 5\, 2993–3002.\n3. Guanzhao Wen et al. \, Hot Exciton Dissociation in Graphene Nanoribbons\, Nature Communication s 2026\, in press.\n4. Wenhao Zheng et al.\, Photothermal effects control ultrafast charge transport in titanium carbide MXenes\, Nature Communicati ons 2026\, 17\, 1201.\n\n\n UID:040000008200E00074C5B7101A82E008000000000072EF3509F4DC01000000000000000 010000000263641BAE0B23C4A8D36947755474A87 SUMMARY;LANGUAGE=en-US:Seminar by dr. Hai Wang (UU) Title Ultrafast Snapsh ots of Charge and Energy Dynamics in Low-Dimensional Materials Using THz S pectroscopy DTSTART;TZID=W. Europe Standard Time:20260618T133000 DTEND;TZID=W. Europe Standard Time:20260618T143000 CLASS:PUBLIC PRIORITY:5 DTSTAMP:20260604T080425Z TRANSP:OPAQUE STATUS:CONFIRMED SEQUENCE:0 LOCATION;LANGUAGE=en-US:VO - Spectrum 5 X-MICROSOFT-CDO-APPT-SEQUENCE:0 X-MICROSOFT-CDO-OWNERAPPTID:1132750826 X-MICROSOFT-CDO-BUSYSTATUS:TENTATIVE X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY X-MICROSOFT-CDO-ALLDAYEVENT:FALSE X-MICROSOFT-CDO-IMPORTANCE:1 X-MICROSOFT-CDO-INSTTYPE:0 X-MICROSOFT-DONOTFORWARDMEETING:FALSE X-MICROSOFT-DISALLOW-COUNTER:FALSE X-MICROSOFT-REQUESTEDATTENDANCEMODE:DEFAULT X-MICROSOFT-ISRESPONSEREQUESTED:TRUE X-MICROSOFT-LOCATIONS:[ { "DisplayName" : "VO - Spectrum 5"\, "LocationAnno tation" : ""\, "LocationSource" : 0\, "Unresolved" : false\, "LocationUri" : "" } ] BEGIN:VALARM DESCRIPTION:REMINDER TRIGGER;RELATED=START:-PT15M ACTION:DISPLAY END:VALARM END:VEVENT END:VCALENDAR