Excitonic dynamics in a single quantum dot within a microcavity

Zhu, Ka-Di; Wu, Zhuo-Jie; Yuan, Xiao-Zhong; Zheng, Hang

doi:10.1103/physrevb.71.235312

Cited by 20 publications

(26 citation statements)

References 33 publications

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“…The terms like to right-hand side terms in (3) were used in so-called "spin-boson" Hamiltonian [15] and in so-called "independent boson model" [16]. Given models were used to study phonon effects in a single quantum dot within a microcavity [17][18][19][20][21]. So, the term (16) in Hamiltonian in [12] coincides with corresponding term in Hamiltonian in [20,21] at N = 1.…”

Section: Resultsmentioning

confidence: 99%

Quantum Field Theory of Dynamics of Spectroscopic Transitions by Strong Dipole-Photon and Dipole-Phonon Coupling

Dovlatova

Yerchuck

2012

ISRN Optics

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Matrix-operator difference-differential equations for dynamics of spectroscopic transitions in 1D multiqubit exchange-coupled (para)magnetic and optical systems by strong dipole-photon and dipole-phonon coupling are derived within the framework of quantum field theory. It has been established that by strong dipole-photon and dipole-phonon coupling the formation of long-lived coherent system of the resonance phonons takes place, and relaxation processes acquire pure quantum character. It is determined by the appearance of coherent emission process of EM-field energy, for which the resonance phonon system is responsible. Emission process is accompanied by phonon Rabi quantum oscillation, which can be time-shared from photon quantum Rabi oscillations, accompanying coherent absorption process of EM-field energy. For the case of radio spectroscopy, it corresponds to the possibility of the simultaneous observation along with (para)magntic spin resonance, the acoustic spin resonance.

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Section: Resultsmentioning

confidence: 99%

Quantum Field Theory of Dynamics of Spectroscopic Transitions by Strong Dipole-Photon and Dipole-Phonon Coupling

Dovlatova

Yerchuck

2012

ISRN Optics

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“…PACS numbers: 71.15.Mb, 72.30.+q, Anticipating a variety of technological applications, molecular scale conductors and devices are the subject of increasingly more research in recently years. One of the most important issues of molecular electronics concerns the dynamic response of molecular devices to external parameters 1,2,3,4,5,6,7 . For ac quantum transport in such small devices, atomic details and non-equilibrium physics must be taken into account.…”

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confidence: 99%

“…calculate two potential landscapes using NEGF-DFT package: the equilibrium potential U eq at t = 0 and the dc potential U at t = ∞. (2). With U eq and U obtained, one solves eigenvalue problem using Eq.…”

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confidence: 99%

Transient dynamics of molecular devices under a steplike pulse bias

et al. 2010

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We report first principles investigation of time-dependent current of molecular devices under a step-like pulse. Our results show that although the switch-on time of the molecular device is comparable to the transit time, much longer time is needed to reach the steady state. In reaching the steady state the current is dominated by resonant states below Fermi level. The contribution of each resonant state to the current shows the damped oscillatory behavior with frequency equal to the bias of the step-like pulse and decay rate determined by the life time of the corresponding resonant state. We found that all the resonant states below Fermi level have to be included for accurate results. This indicates that going beyond wideband limit is essential for a quantitative analysis of transient dynamics of molecular devices. PACS numbers: 71.15.Mb, 72.30.+q, Anticipating a variety of technological applications, molecular scale conductors and devices are the subject of increasingly more research in recently years. One of the most important issues of molecular electronics concerns the dynamic response of molecular devices to external parameters 1,2,3,4,5,6,7 . For ac quantum transport in such small devices, atomic details and non-equilibrium physics must be taken into account. So, in principle, one should use the theory of non-equilibrium Green's function (NEGF) 8 coupled with the time-dependent density functional theory (TDDFT) 9 to study the time-dependent transport of molecular devices. Practically, it is very difficult to implement it at present stage due to the huge computational cost. One possible way to overcome this problem is to use the adiabatic approximation, an approach widely used in mesoscopic physics. In this approach, one starts from a steady-state Hamiltonian and adds the time dependent electric field adiabatically. This is a reasonable approximation since most of the time the applied electric field is much smaller than the electrostatic field inside the scattering region. In addition, it has been shown numerically 6 that dc transport properties such as I-V curve obtained from the equation of motion method coupled with TDDFT agrees with that obtained by the method of NEGF coupled with the density functional theory (DFT) 10,11 . Hence, under the adiabatic approximation, one could replace TDDFT by DFT and use the NEGF+DFT scheme to calculate ac transport properties of molecular devices. We consider a system that consists of a scattering region coupled to two leads with the external time dependent pulse bias potential v α (t). The time-dependent current for a step-like pulse has been derived exactly going beyond the wide-band limit by Maciejko et al 4 . Since the general expression for the current involves triple integrations, it is extremely difficult if not impossible to calculate the time-dependent current for real systems like molecular devices. In this regard, approximation has to be made in order to carry out time-dependent simulations of molecular devices. We note that the simplest approximation is the ...

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“…We can easily imagine that phonons play a significant role in such spin-orbit driven coherent oscillations. 12,22,23 In this work, we will investigate the effect of electron-phonon interaction on the dc conductivity in the presence of a perpendicular magnetic field and the RSOI using the previous result, 4 which satisfies the population criterion. Therefore, it is possible, in an organized way, to present the phonon emissions and absorptions in all electron transition processes.…”

Section: Introductionmentioning

confidence: 97%

Shubnikov-de Haas-like oscillatory pattern of dc conductivity in a 2-dimensional indium gallium arsenide

Kang

Lee

Choi

2011

Journal of Applied Physics

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The conductivity formula derived by using the KC reduction identity and a state-dependent projection technique is applied to a two-dimensional system of electrons interacting with deformation potential acoustic phonons. The system is in the presence of a perpendicular magnetic field and of the Rashba spin-orbit interaction (RSOI). The dc conductivity is shown to oscillate with the magnetic field above 0:6T near the Zeeman factor g ¼ À0:8 and the RSOI strength a 0 ¼ 0:5 Â 10 À11 eV Á m. The pattern of oscillations is shown to be susceptible to change even by small change in g and a 0 , while the deformation potential constant, which characterizes the electron-phonon interaction, plays no role in changing the pattern at the temperature T ¼ 70 K.

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Excitonic dynamics in a single quantum dot within a microcavity

Cited by 20 publications

References 33 publications

Quantum Field Theory of Dynamics of Spectroscopic Transitions by Strong Dipole-Photon and Dipole-Phonon Coupling

Quantum Field Theory of Dynamics of Spectroscopic Transitions by Strong Dipole-Photon and Dipole-Phonon Coupling

Transient dynamics of molecular devices under a steplike pulse bias

Shubnikov-de Haas-like oscillatory pattern of dc conductivity in a 2-dimensional indium gallium arsenide

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