Far-infrared response of quantum dots: From few electron excitations to magnetoplasmons

D. Pfannkuche; Vidar Gudmundsson; P. Hawrylak; R. R. Gerhardts

doi:10.1016/0038-1101(94)90394-8

Far-infrared response of quantum dots: From few electron excitations to magnetoplasmons

D. Pfannkuche
, Vidar Gudmundsson
, P. Hawrylak
, R. R. Gerhardts

Raunvísindadeild

Háskóli Íslands

Rannsóknarafurð: Framlag til fræðitímarits › Grein › ritrýni

Útdráttur

We study the far-infrared (FIR) response of quantum dots with a variable number N_s of electrons and a non-parabolic confinement in a magnetic field B. For few electrons we compare the results of a Hartree (H) and a Hartree-Fock (HF) approach with those obtained by an exact diagonalization of the few-particle Hamiltonian. A good qualitative agreement is found between the HF approximation and the exact calculation. The resonance spectra are fingerprints of the ground state of the electron system and depend therefore strongly on N_s and B. With an increasing number of electrons, the H- and the HF-calculations show new features evolving in the FIR spectra. These features resemble the non-local mode coupling effects observed in the magnetoplasmon dispersion of two- and one-dimensional systems marking the transition to a quasi-classical hydrodynamic behaviour.

Upprunalegt tungumál	Enska
Síður (frá-til)	1221-1226
Síðufjöldi	6
Fræðitímarit	Solid State Electronics
Bindi	37
Númer tölublaðs	4-6
DOI	https://doi.org/10.1016/0038-1101(94)90394-8
Útgáfustaða	Útgefið - 1994

Athugasemd

Funding Information: Acknowledgements--We would like to thank D. Heitmann, P. Grambow, E. Vasiliadou and B. Meurer for fruitful discussions about experimentally observed FIR spectra on various quantum dots. Two of us (D. P. and V. G.) very much appreciate the intense and instructive discussions with A. H. MacDonald about the origin of the 2me-mode. This research was supported in part by the Icelandic Natural Science Foundation and the Bundesminister fiir Forschung und Technologic under contract number TK0375/2 as well as a NATO Collaborative Research Grant CRG921204.

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10.1016/0038-1101(94)90394-8

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@article{098d81d670c94332ae5a420770b19007,

title = "Far-infrared response of quantum dots: From few electron excitations to magnetoplasmons",

abstract = "We study the far-infrared (FIR) response of quantum dots with a variable number Ns of electrons and a non-parabolic confinement in a magnetic field B. For few electrons we compare the results of a Hartree (H) and a Hartree-Fock (HF) approach with those obtained by an exact diagonalization of the few-particle Hamiltonian. A good qualitative agreement is found between the HF approximation and the exact calculation. The resonance spectra are fingerprints of the ground state of the electron system and depend therefore strongly on Ns and B. With an increasing number of electrons, the H- and the HF-calculations show new features evolving in the FIR spectra. These features resemble the non-local mode coupling effects observed in the magnetoplasmon dispersion of two- and one-dimensional systems marking the transition to a quasi-classical hydrodynamic behaviour.",

author = "D. Pfannkuche and Vidar Gudmundsson and P. Hawrylak and Gerhardts, \{R. R.\}",

note = "Funding Information: Acknowledgements--We would like to thank D. Heitmann, P. Grambow, E. Vasiliadou and B. Meurer for fruitful discussions about experimentally observed FIR spectra on various quantum dots. Two of us (D. P. and V. G.) very much appreciate the intense and instructive discussions with A. H. MacDonald about the origin of the 2me-mode. This research was supported in part by the Icelandic Natural Science Foundation and the Bundesminister fiir Forschung und Technologic under contract number TK0375/2 as well as a NATO Collaborative Research Grant CRG921204.",

year = "1994",

doi = "10.1016/0038-1101(94)90394-8",

language = "English",

volume = "37",

pages = "1221--1226",

journal = "Solid State Electronics",

issn = "0038-1101",

publisher = "Elsevier Ltd.",

number = "4-6",

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TY - JOUR

T1 - Far-infrared response of quantum dots

T2 - From few electron excitations to magnetoplasmons

AU - Pfannkuche, D.

AU - Gudmundsson, Vidar

AU - Hawrylak, P.

AU - Gerhardts, R. R.

N1 - Funding Information: Acknowledgements--We would like to thank D. Heitmann, P. Grambow, E. Vasiliadou and B. Meurer for fruitful discussions about experimentally observed FIR spectra on various quantum dots. Two of us (D. P. and V. G.) very much appreciate the intense and instructive discussions with A. H. MacDonald about the origin of the 2me-mode. This research was supported in part by the Icelandic Natural Science Foundation and the Bundesminister fiir Forschung und Technologic under contract number TK0375/2 as well as a NATO Collaborative Research Grant CRG921204.

PY - 1994

Y1 - 1994

N2 - We study the far-infrared (FIR) response of quantum dots with a variable number Ns of electrons and a non-parabolic confinement in a magnetic field B. For few electrons we compare the results of a Hartree (H) and a Hartree-Fock (HF) approach with those obtained by an exact diagonalization of the few-particle Hamiltonian. A good qualitative agreement is found between the HF approximation and the exact calculation. The resonance spectra are fingerprints of the ground state of the electron system and depend therefore strongly on Ns and B. With an increasing number of electrons, the H- and the HF-calculations show new features evolving in the FIR spectra. These features resemble the non-local mode coupling effects observed in the magnetoplasmon dispersion of two- and one-dimensional systems marking the transition to a quasi-classical hydrodynamic behaviour.

AB - We study the far-infrared (FIR) response of quantum dots with a variable number Ns of electrons and a non-parabolic confinement in a magnetic field B. For few electrons we compare the results of a Hartree (H) and a Hartree-Fock (HF) approach with those obtained by an exact diagonalization of the few-particle Hamiltonian. A good qualitative agreement is found between the HF approximation and the exact calculation. The resonance spectra are fingerprints of the ground state of the electron system and depend therefore strongly on Ns and B. With an increasing number of electrons, the H- and the HF-calculations show new features evolving in the FIR spectra. These features resemble the non-local mode coupling effects observed in the magnetoplasmon dispersion of two- and one-dimensional systems marking the transition to a quasi-classical hydrodynamic behaviour.

UR - https://www.scopus.com/pages/publications/0028410239

U2 - 10.1016/0038-1101(94)90394-8

DO - 10.1016/0038-1101(94)90394-8

M3 - Article

SN - 0038-1101

VL - 37

SP - 1221

EP - 1226

JO - Solid State Electronics

JF - Solid State Electronics

IS - 4-6

ER -

Far-infrared response of quantum dots: From few electron excitations to magnetoplasmons

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