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DTSTART:20170326T030000
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DTSTART:20161030T020000
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DTSTAMP:20260428T192948Z
UID:585bf2501c1e4648064970@ist.ac.at
DTSTART:20170202T094500
DTEND:20170202T104500
DESCRIPTION:Speaker: Ziliang Ye\nAbstract: Following the success of graphen
 e\, the transition metal dichalcogenide (TMDC) family of the form MX2 (M =
  Mo\, W\; X = S\, Se\, Te) has attracted significant attention as a two-di
 mensional semiconductor. While maintaining the advantageous flexibility an
 d tunability found in graphene\, TMDCs possess a band gap that transitions
  from the indirect to direct type at the monolayer limit\, giving rise to 
 an extraordinarily strong light-matter interaction. In this talk\, I will 
 discuss our effort to understand and control the electronic structure of T
 MDCs using ultrafast light. We will present our discovery of a strong and 
 anomalous excitonic effect in the TMDC monolayer\, where the room-temperat
 ure stable exciton emerges from an unscreened Coulomb interaction in the t
 wo-dimensional space [1]. In addition\, we will report our recent successf
 ul coherent manipulation of the valley polarization\, a degree of freedom 
 analogous to spin but exists only in the momentum space of the electron [2
 ]. The ability to control the valley degree of freedom can potentially ena
 ble a new platform for quantum information applications.\n\n[1] Z. Ye et a
 l. Nature 513\, 214 (2014)\n\n[2] Z. Ye et al. Nature Physics (2016) doi:1
 0.1038/nphys3891\n
LOCATION:Mondi Seminar Room 2\, Central Building\, ISTA
ORGANIZER:pdelreal@ist.ac.at
SUMMARY:Ziliang Ye: Valley exciton in 2D semiconductor: from experimental o
 bservation to coherent manipulation 
URL:https://talks-calendar.ista.ac.at/events/76
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