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DTSTAMP:20261019T131347Z
LAST-MODIFIED:20160427T134127Z
DTSTART:20160428T163000Z
DTEND:20160428T173000Z
UID:event1596@bu.edu
URL:http://physics.bu.edu/internal/events/show/1596
SUMMARY:Long Tailed Trions in Monolayer MoS2: Exploring Many-body Physics t
	hrough Temperature Dependent Photoluminescence
DESCRIPTION:Featuring Jason Christopher\n\nPart of the Preliminary Oral Exa
	m.\n\nExamining Committee: Bennett Goldberg\, Anna Swan\, Claudio Chamon\, 
	Ami Katz\n\nAbstract: Monolayer molybdenum disulfide (MoS2) has emerged as 
	an ideal material for exploring many-body physics\, because of its two in-e
	quivalent\, direct gap valleys and exotic bound states.  Here we focus on o
	ne such bound state\, the trion\, which consists of two electrons and a hol
	e.  Unlike excitons\, trions can radiatively decay with non-zero momentum b
	y kicking out an electron.  This simple difference from excitons results in
	 an asymmetric trion photoluminescence (PL) peak with a long low energy tai
	l.  The tail length depends on two factors: one for the trion momentum dist
	ribution and another for the structure of the bound state.  We use temperat
	ure to alter the momentum distribution and thus separate these two factors.
	  Our detailed analysis reveals the trion effective radius and binding ener
	gy\, as well as the ratio of the effective hole mass to electron mass.  By 
	including the trion's long tail in our analysis we are also able to separat
	e the exciton and trion contributions to the PL spectra more accurately pro
	viding greater insight into the temperature dependence of the band gap and 
	spin-orbit splitting of the valence band.  The analysis and concepts presen
	ted here are applicable to other atomically thin transition metal dichalcog
	enides (TMDC) where trions have been observed such as molybdenum diselenide
	 (MoSe2) and tungsten diselenide (WSe2). \n\n![Christopher](/resources/even
	t-image/1596/a351a96_small)
LOCATION:PRB 365\, 3 Cummington Mall\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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