Magnon squeezing in antiferromagnetic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>MnF</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>FeF</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Zhao, Jimin; Bragas, Andrea V.; Merlín, R.; Lockwood, D. J.

doi:10.1103/physrevb.73.184434

Cited by 93 publications

(114 citation statements)

References 32 publications

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“…THz experiments on photoexcited bundled tubes revealed a non-Drude response attributed to small-gap metallic tubes or inter-tube charge separation [13,14]. Mid-IR transient absorption was also observed in bundled nanotubes and assigned to transitions from allowed to dipole-forbidden excitons [15,16].…”

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confidence: 91%

“…Applied to individualized SWNTs, intra-excitonic resonances can thus measure both bright and dark excitons and should occur in the mid-infrared (mid-IR) after ultrafast excitation. In contrast to extensive interband nanotube studies [9][10][11][12], only a few ultrafast intra-band experiments have been carried out which focus largely on nanotube bundles [13][14][15][16]. THz experiments on photoexcited bundled tubes revealed a non-Drude response attributed to small-gap metallic tubes or inter-tube charge separation [13,14].…”

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confidence: 99%

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Ultrafast Mid-Infrared Intra-Excitonic Response of Individualized Single-Walled Carbon Nanotubes

Wang

Graham

et al. 2010

Conference on Lasers and Electro-Optics 2010

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We report a femtosecond mid-infrared study of the broadband low-energy response of individually separated (6,5) and (7,5) single-walled carbon nanotubes. Strong photoinduced absorption is observed around 200 meV, whose transition energy, oscillator strength, resonant chirality enhancement and dynamics manifest the observation of quasi-1D intra-excitonic transitions. A model of the nanotube 1s-2p cross section agrees well with the signal amplitudes. Our study further reveals saturation of the photoinduced absorption with increasing phase-space filling of the correlated e-h pairs.

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confidence: 91%

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confidence: 99%

Ultrafast Mid-Infrared Intra-Excitonic Response of Individualized Single-Walled Carbon Nanotubes

Wang

Graham

et al. 2010

Conference on Lasers and Electro-Optics 2010

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“…Electron-electron (e-e) interactions are included in the model, thus exciton physics is produced, and excellent agreements with experiments have been achieved [5,9,24,25]. The Hamiltonian is…”

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confidence: 99%

“…Taken into account that SWCNTs are similar to π-conjugated polymers [9] and that their carbon atoms are non-planar, we chose t = 2.0 eV [24]. We have chosen U = 8 eV, same as previous calculations on semiconducting SWCNTs and π-conjugated polymers [27].…”

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confidence: 99%

“…Therefore, SWCNTs provide an excellent opportunity to study the possible excitons in metallic states. In metallic SWCNTs, except for the one pair of bands that touch (or nearly touch) the Fermi surface, all pairs of bands are gapped and may form exciton-continuum manifolds [9] as in semiconducting SWCNTs. Optical measurements addressing excitons in metallic SWCNTs are challenging and only very few experiments have been reported.…”

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Observation of Exciton-Phonon Sideband in Individual Metallic Single-Walled Carbon Nanotubes

et al. 2009

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Single-walled carbon nanotubes (SWCNTs) are quasi-one-dimensional systems with poor Coulomb screening and enhanced electron-phonon interaction, and are good candidates for excitons and exciton-phonon couplings in metallic state. Here we report back scattering reflection experiments on individual metallic SWCNTs. An exciton-phonon sideband separated by 0.19 eV from the first optical transition peak is observed in a metallic SWCNT of chiral index (13,10), which provides clear evidences of excitons in metallic SWCNTs. A static dielectric constant of 10 is estimated from the reflectance spectrum.PACS numbers: 81.07.De Single-walled carbon nanotubes (SWCNTs) have been the topic of extensive research for their potentially broad applications [1] and fundamental scientific interest. SWCNTs can be either semiconducting or metallic depending on their diameters and chiral angles. One of the important and challenging issues is the possible excitons in SWCNTs. Excitons are pairs of electrons and holes bound by the attractive Coulomb interaction, and are fundamental to our understanding of optical properties of semiconductors. After a series of theoretical and experimental works, a consensus has been reached that excitons are also prominent factors in optical transitions of semiconducting SWCNTs [2,3,4,5,6].Although excitons are common in semiconductors and insulators, excitons are not expected in bulk metals because of the metallic strong Coulomb screening, which prohibits the bound state of electrons and holes in three dimensional (3D) systems. SWCNTs are quasi-1D systems with poor Coulomb screening. The relaxed bounding criteria and the much weaker screening in low dimension are in favor of the existence of excitons in metallic SWCNTs, as predicted in recent theoretical studies [7,8]. Therefore, SWCNTs provide an excellent opportunity to study the possible excitons in metallic states. In metallic SWCNTs, except for the one pair of bands that touch (or nearly touch) the Fermi surface, all pairs of bands are gapped and may form exciton-continuum manifolds [9] as in semiconducting SWCNTs. Optical measurements addressing excitons in metallic SWCNTs are challenging and only very few experiments have been reported. Very recently, Wang et al. reported absorption spectrum of an armchair metallic SWCNT with chiral index of (21,21). From the line shape of the optical transition, they identified the signature of exciton formation [10]. On the other hand, Berciaud et al. reported absorption spectrum using photothermal heterodyne detection. They found no exciton-phonon sideband and suggested weak excitonic effect in metallic SWCNTs [11]. The lack of experiments on metallic SWCNTs is partially due to the fact that photoluminescence spectroscopy, which is widely used in semiconducting SWCNTs, can not be employed in metallic systems because of their low fluorescence yield. Resonant Raman scattering is also popular, but difficult to obtain a wide-range spectrum which is usually needed to obtain the excitonic information. In contrast, R...

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Dynamical Stability and Physical Properties of Fe Dihalide Nanowires

Mejı́a-López

López-Moreno

Mazo-Zuluaga

et al. 2023

Advcd Theory and Sims

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An extensive first‐principles and atomistic Monte Carlo study on isolated Fe ( = F, Cl, Br, I) nanowires is presented. The structural properties of the Fe chains are determined and compared with their bulk structures. The results indicate that in the lowest energy configuration, the wires crystalize in a system that belongs to the space group (No. 131, Z = 2, point group ), with antiferromagnetic arrangement. The stability is determined by calculating the phonon frequencies in the whole Brillouin zone within the supercell approach. The relative stability of the periodic chains is also determined by calculating the elastic properties and comparing them with bulk cases. The band structure, the density of states, the magnetic properties, the anisotropy energy, and topological analysis, performed with the Quantum Theory of Atoms in Molecules approach, are also reported and discussed. The results support the idea that these Fe nanowire systems are promising materials for practical applications, like lithium‐ion batteries.

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Magnon squeezing in antiferromagneticMnF2andFeF2

Cited by 93 publications

References 32 publications

Ultrafast Mid-Infrared Intra-Excitonic Response of Individualized Single-Walled Carbon Nanotubes

Ultrafast Mid-Infrared Intra-Excitonic Response of Individualized Single-Walled Carbon Nanotubes

Observation of Exciton-Phonon Sideband in Individual Metallic Single-Walled Carbon Nanotubes

Dynamical Stability and Physical Properties of Fe Dihalide Nanowires

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