Browsing by Author "Chen, Guang-Yin"

Now showing 1 - 4 of 4

Detecting non-Markovian plasmonic band gaps in quantum dots using electron transport
(2009-06-01)
Chen, Yueh-Nan
;
Chen, Guang-Yin
;
Liao, Ying-Yen
;
Lambert, Neill
;
Nori, Franco
Placing a quantum dot close to a metal nanowire leads to drastic changes in its radiative decay behavior because of evanescent couplings to surface plasmons. We show how two non-Markovian effects, band edge and retardation, could be observed in such a system. Combined with a quantum-dot p-i-n junction, these effects could be readout via current-noise measurements. We also discuss how these effects can occur in similar systems with restricted geometries, such as phononic cavities and photonic crystal waveguides. This work links two previously separate topics: surface plasmons and current-noise measurements.
Proposal for detection of non-Markovian decay via current noise
(2008-01-01)
Chen, Yueh-Nan
;
Chen, Guang-Yin
;
物理研究所
;
Institute of Physics
We propose to detect non-Markovian decay of an exciton qubit coupled to multimode bosonic reservoir via shot-noise measurements. Nonequilibrium current noise is calculated for a quantum dot embedded inside a p-i-n junction. An additional term from non-Markovian effect is obtained in the derivation of noise spectrum. As examples, two practical photonic reservoirs, photon vacuum with the inclusion of cut-off frequency and surface plasmons, are given to show that the noise may become super-Poissonian due to this non-Markovian effect. Utilizing the property of super-radiance is further suggested to enhance the noise value.
Spontaneous emission of quantum dot excitons into surface plasmons in a nanowire
(2008-10-01)
Chen, Guang-Yin
;
Chen, Yueh-Nan
;
Chun, Der-San
;
電子物理學系
;
物理研究所
The spontaneous emission (SE) of quantum dot (QD) excitons into surface plasmons in a cylindrical nanowire is investigated theoretically. Maxwell's equations with appropriate boundary conditions are solved numerically to obtain the dispersion relations of surface plasmons. The SE rate of QD excitons is found to be greatly enhanced at certain values of the exciton bandgap. Application in generation of remote entangled states via superradiance is also pointed out and may be observable with current technology. (C) 2008 Optical Society of America
The Maintaining of the Exciton State in the Two-QD System with Dipole Dipole Interaction and the Intrinsic Electron-Hole Exchange Interaction
(2017-01-01)
Huang, Shiang-Yu
;
Chen, Guang-Yin
;
Chen, Yueg-Nan
;
Cheng, Shun-Jen
;
電機學院