Intrinsic homogeneous linewidth and broadening mechanisms of excitons in monolayer transition metal dichalcogenides
Kavir Dass, Chandriker
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
MetadataShow full item record
AbstractThe band-edge optical response of transition metal dichalcogenides, an emerging class of atomically thin semiconductors, is dominated by tightly bound excitons localized at the corners of the Brillouin zone (valley excitons). A fundamental yet unknown property of valley excitons in these materials is the intrinsic homogeneous linewidth, which reflects irreversible quantum dissipation arising from system (exciton) and bath (vacuum and other quasiparticles) interactions and determines the timescale during which excitons can be coherently manipulated. Here we use optical two-dimensional Fourier transform spectroscopy to measure the exciton homogeneous linewidth in monolayer tungsten diselenide (WSe2). The homogeneous linewidth is found to be nearly two orders of magnitude narrower than the inhomogeneous width at low temperatures. We evaluate quantitatively the role of exciton–exciton and exciton–phonon interactions and population relaxation as linewidth broadening mechanisms. The key insights reported here—strong many-body effects and intrinsically rapid radiative recombination—are expected to be ubiquitous in atomically thin semiconductors.
CitationIntrinsic homogeneous linewidth and broadening mechanisms of excitons in monolayer transition metal dichalcogenides 2015, 6:8315 Nature Communications
PublisherNature Publishing Group
- Population pulsation resonances of excitons in monolayer MoSe2 with sub-1 μeV linewidths.
- Authors: Schaibley JR, Karin T, Yu H, Ross JS, Rivera P, Jones AM, Scott ME, Yan J, Mandrus DG, Yao W, Fu KM, Xu X
- Issue date: 2015 Apr 3
- Excitonic linewidth and coherence lifetime in monolayer transition metal dichalcogenides.
- Authors: Selig M, Berghäuser G, Raja A, Nagler P, Schüller C, Heinz TF, Korn T, Chernikov A, Malic E, Knorr A
- Issue date: 2016 Nov 7
- Exciton Relaxation Cascade in two-dimensional Transition Metal Dichalcogenides.
- Authors: Brem S, Selig M, Berghaeuser G, Malic E
- Issue date: 2018 May 29
- Control of Coherently Coupled Exciton Polaritons in Monolayer Tungsten Disulphide.
- Authors: Liu X, Bao W, Li Q, Ropp C, Wang Y, Zhang X
- Issue date: 2017 Jul 14
- Optical two-dimensional fourier transform spectroscopy of semiconductor quantum wells.
- Authors: Cundiff ST, Zhang T, Bristow AD, Karaiskaj D, Dai X
- Issue date: 2009 Sep 15