Spin-dependent dipole excitation in alkali-metal nanoparticles

Yin, Yuncong; Hervieux, Paul-Antoine; Jalabert, Rodolfo A.; Manfredi, Giovanni; Maurat, Emmanuel; Weinmann, Dietmar

doi:10.1103/physrevb.80.115416

Cited by 7 publications

(5 citation statements)

References 28 publications

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“…In addition, when the ground-state magnetization in nanoparticles is nonzero, the collective electronic excitations couple to spindependent excitations in the nanoparticle. 51 This is the case in nanoparticles with an open electronic shell, particularly for the case of ferromagnetic nanoparticles. It then becomes possible to affect the magnetization indirectly by exciting the charge degrees of freedom, and the influence of the magnetic field on the latter might become important.…”

Section: Discussionmentioning

confidence: 99%

Lifetime of the surface magnetoplasmons in metallic nanoparticles

Weick

Weinmann²

2011

Phys. Rev. B

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We study the influence of an external magnetic field on the collective electronic excitations in metallic nanoparticles. While the usual surface plasmon corresponding to the collective oscillation of the electrons with respect to the ionic background persists in the direction parallel to the magnetic field, the components in the perpendicular plane are affected by the field and give rise to two collective modes with field-dependent frequencies, the surface magnetoplasmons. We analyze the decay of these collective excitations by their coupling to particle-hole excitations and determine how their lifetimes are modified by the magnetic field. In particular, we show that the lifetime of the usual surface plasmon is not modified by the magnetic field, while the lifetime of the two surface magnetoplasmons present a weak magnetic-field dependence. Optical spectroscopy experiments are suggested in which signatures of the surface magnetoplasmons may be observed.

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Section: Discussionmentioning

confidence: 99%

Lifetime of the surface magnetoplasmons in metallic nanoparticles

Weick

Weinmann²

2011

Phys. Rev. B

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“…In the systems with spin polarized electronic structure, one may expect some magnetic responses to the photon (electromagnetic) irradiation, while non-magnetic systems exhibit only electric response to an external electromagnetic field. 42 Therefore, we calculated the spin dipole response of S3, S4, and S5 FCNTs to an external magnetic field, in the framework of TD-LSDA. The obtained spectra, presented in Fig.…”

Section: Optical Spectramentioning

confidence: 99%

Ab-initio investigation of structural, electronic, and optical properties of (5,0) finite-length carbon nanotube

Ahmadpour,

Hashemifar,

Rostamnejadi

2016

Preprint

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We use density functional computations to study the size effects on the structural, electronic, magnetic, and optical properties of (5,0) finite carbon nanotubes (FCNT), with length in the range of 4-44 Å. It is found that the structural and electronic properties of (5,0) FCNTs, in the ground state, converge at a length of about 30 Å, while the excited state properties exhibit long-range edge effects. We discuss that curvature effects govern the electronic structure of short (5,0) FCNTs and enhance energy gap of these systems, in contrast to the known trend in the periodic limit. It is seen that compensation of curvature effects in two special small sizes, may give rise to spontaneous magnetization. The obtained cohesive energies provide some insights into the effects of environment on the growth of FCNTs. The second-order difference of the total energies reveals an important magic size of about 15 Å. The optical and dynamical magnetic responses of the FCNTs to polarized electromagnetic pulses are studied by time dependent density functional theory. The obtained results show that the static and dynamic magnetic properties mainly come from the edge carbon atoms. The optical absorption properties are described in term of local field effects and characterized by Casida linear response calculations.

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“…This coupling has also been found in quantum dots 38 and metal clusters. 47,48 We have determined the persistent current in the TCQR, whose intensity is calculated as I =−e͐drJ͑r͒ · ê , where J is the probability current density vector consisting of a paramagnetic plus a diamagnetic term, J = J p + J d with…”

Section: B B å 0 Casementioning

confidence: 99%

Ground state and infrared response of triple concentric quantum ring structures

2010

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Within local-spin density-functional theory, we study the ground state and infrared response of twodimensional, triple concentric quantum ring nanostructures. Changes in their physical properties are presented as a function of the number of electrons or the intensity of a perpendicularly applied magnetic field. We discuss the addition spectrum of few-electron triple quantum rings at zero magnetic field, as well as the physical appearance of the ground state and dipole response of selected systems containing up to 50 electrons. We also investigate the ground state, persistent currents, and charge-and spin-density responses of a system made of 30 electrons.

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Spin-dependent dipole excitation in alkali-metal nanoparticles

Cited by 7 publications

References 28 publications

Lifetime of the surface magnetoplasmons in metallic nanoparticles

Lifetime of the surface magnetoplasmons in metallic nanoparticles

Ab-initio investigation of structural, electronic, and optical properties of (5,0) finite-length carbon nanotube

Ground state and infrared response of triple concentric quantum ring structures

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