Optical properties of atomically thin transition metal dichalcogenides are controlled by robust excitons characterized by a very large oscillator strengths. Encapsulation of monolayers such as ...MoSe_{2} in hexagonal boron nitride (hBN) yields narrow optical transitions approaching the homogenous exciton linewidth. We demonstrate that the exciton radiative rate in these van der Waals heterostructures can be tailored by a simple change of the hBN encapsulation layer thickness as a consequence of the Purcell effect. The time-resolved photoluminescence measurements show that the neutral exciton spontaneous emission time can be tuned by one order of magnitude depending on the thickness of the surrounding hBN layers. The inhibition of the radiative recombination can yield spontaneous emission time up to 10 ps. These results are in very good agreement with the calculated recombination rate in the weak exciton-photon coupling regime. The analysis shows that we are also able to observe a sizable enhancement of the exciton radiative decay rate. Understanding the role of these electrodynamical effects allows us to elucidate the complex dynamics of relaxation and recombination for both neutral and charged excitons.
A study is presented of a possible future measurement of the longitudinal
structure function $F_{L}(x,Q^{2})$ with different proton beam energies at
HERA.
Detailed study of the K L → π 0 π 0 π 0 Dalitz plot Abouzaid, E.; Arenton, M.; Barker, A. R. ...
Physical review. D, Particles, fields, gravitation, and cosmology,
8/2008, Letnik:
78, Številka:
3
Journal Article
The article analyses the use of endoscopic selective drug denervation of the stomach (ESDDS) in 58 patients with reflux esophagitis. Complex appraisal of the efficacy of the treatment showed the ...result to be good and satisfactory in one month in 96.4% of cases and 6 month after ESDDS in 89.1% of cases; the respective values in the same terms after nonoperative treatment were 66.7% and 54.5%. The pathogenetic substantiation of the use of ESDDS is the arrest of the flow of pathological vegetative impulses due to its action, which promotes restoration of regulation of the main functions of the gastroesophageal system which become almost natural, and normalizes processes of autocleansing of the esophagus. The method may be recommended for treating active manifestations of reflux esophagitis and preventing recurrences, including cases of its combination with duodenal ulcer.
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