The photocurrent generated by photon replica states of an off-resonantly coupled dot-cavity system

Abdullah, Nzar Rauf; Tang, Chi-Shung; Manolescu, Andrei; Guðmundsson, Viðar

doi:10.1038/s41598-019-51320-8

Cited by 14 publications

(8 citation statements)

References 42 publications

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“…In this article, we have studied the atom localization based on dynamic Stark effect in the absorptive response in a V-type atom driven by the spatially modulated microwave field. Similar low-frequency-induced control of coherence effects are reported to be of increasing demand in various schemes at molecular level 34 , superconducting quantum circuits 35 and off-resonantly coupled quantum dot-cavity systems 36 . In the present atom-field system, we have shown the coherent control of localization in both the 1D and 2D cases for different choices of parameters controlling the evolution of standing waves in the system.…”

supporting

confidence: 60%

Optical absorption microscopy of localized atoms at microwave domain: two-dimensional localization based on the projection of three-dimensional localization

Dutta¹,

Panchadhyayee

Bayal³

et al. 2020

Sci Rep

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A new approach for achieving two-dimensional (2D) atom localization microscopy based on the projection of three-dimensional (3D) localization in the plane of the detector is described in the present work. Spatial variation of the position-dependent 2D-localization pattern in the xy-plane is obtained with the shifting of the position of the detector along the z-axis under the parallel-and cross-axis configurations of the standing-wave fields. An attempt is made to study the 2D-localization characteristics in the specific parametric conditions for which the localization structures evolve with different shapes eventually leading to 100% detection probability of the atom both in the subwavelength and sub-half-wavelength regimes. The scope of tuning the cross-axis configuration over a wide range adds novelty and robustness to this model. Apart from the 2D-localization, various localization patterns with eight-to single-peak structures appear as interesting outcomes through the efficient manipulation of control parameters in the study of one-dimensional (1D) atom localization. The application of the traveling-wave field or its equivalent appears to be unique in achieving high-precision localization with maximal probability (100%) in both the 1D and 2D field-configuration schemes. Proper tuning of the traveling wave accompanied by the standing wave in the 1D scheme results in the singlepeak localization in the sub-half-wavelength range. As a whole, the present work seems to be very much efficient for high-precision optical lithography.

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supporting

confidence: 60%

Optical absorption microscopy of localized atoms at microwave domain: two-dimensional localization based on the projection of three-dimensional localization

Dutta¹,

Panchadhyayee

Bayal³

et al. 2020

Sci Rep

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“…In order to show the thermoelectric performance of materials and devices, we should have a high figure of merit or a power factor [40,41]. It is well known that a high figure of merit, ZT = (S 2 σ/k)T , requires a low electronic thermal conductivity, k, and a high Seebeck coefficient, S, and electrical conductivity, σ.…”

Section: Resultsmentioning

confidence: 99%

Role of interlayer spacing on electronic, thermal and optical properties of BN-codoped bilayer graphene:\break Influence of the interlayer and the induced dipole-dipole interactions

Abdullah,

Rashid,

Tang

et al. 2021

Preprint

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We demonstrate that the electronic, thermal, and optical properties of a graphene bilayer with boron and nitrogen dopant atoms can be controlled by the interlayer distance between the layers in which the interaction energy and the van der Waals interaction between the dopant atoms play an essential role. We find a conversion of an AA-to an AB-stacked bilayer graphene caused by the repulsive interaction between dopant atoms. At a short interlayer distance, a strong repulsive interaction inducing a strong electric dipole moment of the dopant atoms is found. This gives rise to a breaking of the high symmetry, opening up a bandgap. Consequently, a considerable change in thermoelectric properties such as the Seebeck coefficient and the figure of merit are seen. The repulsive interaction is reduced by increasing the interlayer distance, and at a large interlayer distance the conversion process of the stacking order vanishes. A small bandgap is found leading to a low Seebeck coefficient and a figure of merit. For both short and large interlayer distances, a prominent peak in the optical response is found in the visible range and the peak position is inversely proportional to the interlayer distance.

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“…Figure 6 displays the many-body energy spectrum of the QD system coupled to the cavity for both x - (a) and y -polarized (b) cavity–photon field where the electron–photon coupling strength is tuned to gγ=0.3 meV. Comparing to the energy spectrum presented in Figure 2, where the electron–photon coupling strength is weaker, gγ=0.1 meV, some changes in the energy spectrum can be seen [47,58]. For instance, the Rabi-splitting between 1st and 1γ0 at the photon energy 1.7 meV becomes larger here for the x -polarized photon field (see Figure 6a).…”

Section: Resultsmentioning

confidence: 99%

“…We have studied Rabi-oscillations in the intermediate time regime [39], oscillations in the electron transport caused by Rabi-resonant states in the steady state [40], photon-assisted tunneling [41] and thermoelectric transport in the transient regime [42,43,44,45,46]. In addition, the photocurrent generated by photon replica states in an off-resonant dot-cavity system has been studied where the Rabi effect plays only a minor role in the transport [47]. The system is said to be in the off-resonant regime if the energy spacing between two specific lowest states of the QD system is smaller than the photon energy.…”

Section: Introductionmentioning

confidence: 99%

Manifestation of the Purcell Effect in Current Transport through a Dot–Cavity–QED System

et al. 2019

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We study the transport properties of a wire-dot system coupled to a cavity and a photon reservoir. The system is considered to be microstructured from a two-dimensional electron gas in a GaAs heterostructure. The 3D photon cavity is active in the far-infrared or the terahertz regime. Tuning the photon energy, Rabi-resonant states emerge and in turn resonant current peaks are observed. We demonstrate the effects of the cavity–photon reservoir coupling, the mean photon number in the reservoir, the electron–photon coupling and the photon polarization on the intraband transitions occurring between the Rabi-resonant states, and on the corresponding resonant current peaks. The Rabi-splitting can be controlled by the photon polarization and the electron–photon coupling strength. In the selected range of the parameters, the electron–photon coupling and the cavity-environment coupling strengths, we observe the results of the Purcell effect enhancing the current peaks through the cavity by increasing the cavity–reservoir coupling, while they decrease with increasing electron–photon coupling. In addition, the resonant current peaks are also sensitive to the mean number of photons in the reservoir.

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The photocurrent generated by photon replica states of an off-resonantly coupled dot-cavity system

Cited by 14 publications

References 42 publications

Optical absorption microscopy of localized atoms at microwave domain: two-dimensional localization based on the projection of three-dimensional localization

Optical absorption microscopy of localized atoms at microwave domain: two-dimensional localization based on the projection of three-dimensional localization

Role of interlayer spacing on electronic, thermal and optical properties of BN-codoped bilayer graphene:\break Influence of the interlayer and the induced dipole-dipole interactions

Manifestation of the Purcell Effect in Current Transport through a Dot–Cavity–QED System

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