Bipolaronic phase in polar semiconductor quantum dots: An all-coupling approach

Krishna, R. Phani Murali; Mukhopadhyay, Soma; Chatterjee, Ashok

doi:10.1016/j.physleta.2006.09.020

Cited by 24 publications

(17 citation statements)

References 14 publications

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“…33 Polaronic states in IIÀVI semiconductor quantum dot were also studied previously. 33 Polaronic states in IIÀVI semiconductor quantum dot were also studied previously.…”

Section: -3mentioning

confidence: 99%

Correlated barrier hopping in CdS nanoparticles and nanowires

Chandran¹,

M²,

Koshy³

et al. 2011

Journal of Applied Physics

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The ac conduction in CdS nanoparticles and nanowires was investigated in the frequency range 10 2 to 10 6 Hz and in the temperature range 303-573K. The behavior of ac conductivity was found to agree with that reported for amorphous materials and doped semiconductors. The values of ac conductivities were found to be higher than those reported for bulk CdS. The experimental results were analyzed with the CBH model proposed by Elliott. This model provided reasonable values for the maximum barrier height and characteristic relaxation time. The electrical properties of CdS nanowires and nanoparticles were compared. It was also found that the concentration of charged defect centers was large in nanowires and nanoparticles and it tended to decrease with an increase in temperature. The density of neutral defect, formed by the conversion of charged defects was also calculated. The defects in both types of nanostructures were studied by photoluminescence spectroscopy. It was found that nanoparticles possessed higher defect density than nanowires.

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“…33 Polaronic states in IIÀVI semiconductor quantum dot were also studied previously. 33 Polaronic states in IIÀVI semiconductor quantum dot were also studied previously.…”

Section: -3mentioning

confidence: 99%

Correlated barrier hopping in CdS nanoparticles and nanowires

Chandran¹,

M²,

Koshy³

et al. 2011

Journal of Applied Physics

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“…in solution (6). The displacement field determines the strain tensor components for the QD material,…”

Section: )mentioning

confidence: 99%

“…HRUSHKA, R.M. PELESHCHAK, 2017 formations [5,6], and the Buimistrov-Pekar method [7]. In particular, in work [8], the binding energy of electron and hole polarons in spherical QDs with an infinitely deep potential well created on the basis of materials with a high ionicity was calculated, by neglecting a lattice deformation in the QD material.…”

Section: Introductionmentioning

confidence: 99%

Polaron State in the Self-Consistent Electron-Deformation Field of the Quantum Dot-Matrix System

Hrushka

Peleshchak

2017

Ukr. J. Phys.

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The potential well depth for an electron in a nanoheterosystem with quantum dots has been calculated in the framework of the self-consistent electron-deformation model. It is shown that the strained InAs/GaAs nanoheterosystem with InAs spherical quantum dots is characterized by deformation fields, which appear at the quantum dot-matrix interface and result in the enhancement of polaron effects in comparison with the unstrained material. The electron polaron energy is calculated, by considering the electrostatic energy and the energy associated with the mechanical and electron-deformation strain components in the quantum-dot and matrix materials. K e y w o r d s: quantum dot, polaron, electron-deformation potential, binding energy, electron.

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“…Because of the conflicting conclusions obtained by different groups, the bipolaron problem in quantum dots has thrown up a new challenge to the theorists. Motivated by this controversy, Mukhopadhyay and Chatterjee (MC) [11] took up this problem and investigated the bipolaronic stability in realistic quantum dots using a variational method based on the Lee-LowPines-Huybrechts (LLPH) technique [12] and showed for the first time that stable bipolarons can indeed form in GaAs, CdS, CdSe and CdTe dots. One of the most important aspects of the investigation of MC is the incorporation of the Coulomb interaction between the two individual polarons in the unbound phase which was hitherto neglected.…”

Section: Introductionmentioning

confidence: 99%

Hartree-Fock approximation of bipolaron state in quantum dots and wires

et al. 2010

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Abstract. The bipolaronic ground state of two electrons in a spherical quantum dot or a quantum wire with parabolic boundaries is studied in the strong electron-phonon coupling regime. We introduce a variational wave function that can conveniently conform to represent alternative ground state configurations of the two electrons, namely, the bipolaronic bound state, the state of two individual polarons, and two nearby interacting polarons confined by the external potential. In the bipolaron state the electrons are found to be separated by a finite distance about a polaron size. We present the formation and stability criteria of bipolaronic phase in confined media. It is shown that the quantum dot confinement extends the domain of stability of the bipolaronic bound state of two electrons as compared to the bulk geometry, whereas the quantum wire geometry aggravates the formation of stable bipolarons.

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Bipolaronic phase in polar semiconductor quantum dots: An all-coupling approach

Cited by 24 publications

References 14 publications

Correlated barrier hopping in CdS nanoparticles and nanowires

Correlated barrier hopping in CdS nanoparticles and nanowires

Polaron State in the Self-Consistent Electron-Deformation Field of the Quantum Dot-Matrix System

Hartree-Fock approximation of bipolaron state in quantum dots and wires

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