BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//GRK 2905 - Ultrafast Nanoscopy - ECPv6.15.20//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:GRK 2905 - Ultrafast Nanoscopy
X-ORIGINAL-URL:https://grk2905.de
X-WR-CALDESC:Events for GRK 2905 - Ultrafast Nanoscopy
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Europe/Berlin
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20240331T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20241027T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20250330T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20251026T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20260329T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20261025T010000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250123T150000
DTEND;TZID=Europe/Berlin:20250123T160000
DTSTAMP:20260507T025658
CREATED:20241205T085651Z
LAST-MODIFIED:20260326T162816Z
UID:1541-1737644400-1737648000@grk2905.de
SUMMARY:RTG Seminar: doc. RNDr. Tomás Novotný:
DESCRIPTION:Optically induced excitonic shifts in transition metal dichalcogenide monolayers \n\n\n\n\n\nCharles University Prague \n\n\n\nIncreasing the speed limits of conventional electronics requires innovative approaches to manipulate other quantum properties of electrons besides their charge or spin. An alternative approach is the manipulation of the valley degree of freedom in semiconductors. In our study\, we demonstrate the possibility of the manipulation of such degrees of freedom in transition metal dichalcogenide monolayers using optical pulses on timescales of a few tens of femtoseconds. \n\n\n\n\n\n\n\n\n\n\n\n\n\nWe report on the theoretical and experimental investigation of valley-selective optical Stark and Bloch-Siegert shifts of exciton resonances in WSe2 and MoS2 monolayers induced by strong circularly polarized nonresonant optical fields. We predict and observe transient shifts of both 1sA and 1sB exciton transitions in the linear interaction regime. The theoretical description is based on semiconductor Bloch equations. The solutions of the equations are obtained with a modified perturbation technique\, which takes into account many-body Coulomb interaction effects. These solutions allow us to explain the polarization dependence of the shifts and calculate their values analytically. We found experimentally the limits of the applicability of the theoretical description by observing the transient exciton spectra change at high field amplitudes of the driving wave.References:[1] A. O. Slobodeniuk\, P. Koutenský\, M. Bartoš\, F. Trojánek\, P. Malý\, T. Novotný\, and M. Kozák\, npj 2D Mater Appl 7\, 17 (2023).[2] A. O. Slobodeniuk\, P. Koutenský\, M. Bartoš\, F. Trojánek\, P. Malý\, T. Novotný\, and M. Kozák\, Phys. Rev. B 106\, 235304 (2022). \n\n\n\nVenue: RUN auditorium \n\n\n\nGRK 2905 & SFB 1277 \n\n\n\nHost: Ferdiand Evers
URL:https://grk2905.de/event/doc-rndr-tomas-novotnyoptically-induced-excitonic-shifts-in-transition-metal-dichalcogenide-monolayers/
CATEGORIES:Seminar
ATTACH;FMTTYPE=image/png:https://grk2905.de/wp-content/uploads/2024/12/Screenshot-2025-01-15-115500-e1736938637998.png
END:VEVENT
END:VCALENDAR