Engineering Point-Defect States in Monolayer WSe2
نویسندگان
چکیده
منابع مشابه
Probing the origin of excitonic states in monolayer WSe2.
Two-dimensional transition metal dichalcogenides (TMDCs) have spurred excitement for potential applications in optoelectronic and valleytronic devices; however, the origin of the dynamics of excitons, trions, and other localized states in these low dimensional materials is not well-understood. Here, we experimentally probed the dynamics of excitonic states in monolayer WSe2 by investigating the...
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We have systematically examined the circular polarization of monolayer WSe2 at different temperature, excitation energy and exciton density. The valley depolarization in WSe2 is experimentally confirmed to be governed by the intervalley electron-hole exchange interaction. More importantly, a non-monotonic dependence of valley circular polarization on the excitation power density has been observ...
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The spin-orbit coupling (SOC) effect has been known to be profound in monolayer pristine transition metal dichalcogenides (TMDs). Here we show that point defects, which are omnipresent in the TMD membranes, exhibit even stronger SOC effects and change the physics of the host materials drastically. In this article we chose the representative monolayer WS2 slabs from the TMD family together with ...
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A robust valley polarization is a key prerequisite for exploiting valley pseudospin to carry information in next-generation electronics and optoelectronics. Although monolayer transition metal dichalcogenides with inherent spin-valley coupling offer a unique platform to develop such valleytronic devices, the anticipated long-lived valley pseudospin has not been observed yet. Here we demonstrate...
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The peak splitting due to the valley Zeeman effect is small compared to the width of the photoluminescence (PL) peaks so care must be taken in determining the Zeeman splitting. The peaks are slightly asymmetric, with shape varying somewhat with magnetic field, and do not conform well to a Gaussian or Lorentzian peak shape. We use two methods to determine the peak position and hence the Zeeman s...
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ژورنال
عنوان ژورنال: ACS Nano
سال: 2019
ISSN: 1936-0851,1936-086X
DOI: 10.1021/acsnano.8b07595