APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

30 Jan 2012

Volume 100, Issue 5, Articles (05xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 100, 053101 (2012); http://dx.doi.org/10.1063/1.3679127 (3 pages)

Shinya Kano, Yasuyuki Yamada, Kentaro Tanaka, and Yutaka Majima
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Calculation of self-diffusion coefficients in diamond

Baohua Zhang and Xiaoping Wu

Appl. Phys. Lett. 100, 051901 (2012); http://dx.doi.org/10.1063/1.3680600 (3 pages) | Cited 2 times

Online Publication Date: 30 January 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
In the light of recently reported pressure-volume-temperature relationships in diamond, we show that the self-diffusion coefficient of diamond as a function of temperature and pressure can be satisfactory reproduced in terms of the bulk elastic and expansivity data by means of a thermodynamical model that interconnects the parameters of point defects to the bulk properties. Our calculated self-diffusion coefficients are in good agreement with the experimental ones when the uncertainties are taken into account.
Show PACS
66.30.H- Self-diffusion and ionic conduction in nonmetals
81.40.Jj Elasticity and anelasticity, stress-strain relations
61.72.jd Vacancies
62.20.D- Elasticity

Polarity-dependent photoemission spectra of wurtzite-type zinc oxide

Jesse Williams, Hideki Yoshikawa, Shigenori Ueda, Yoshiyuki Yamashita, Keisuke Kobayashi, Yutaka Adachi, Hajime Haneda, Takeshi Ohgaki, Hiroki Miyazaki, Takamasa Ishigaki, and Naoki Ohashi

Appl. Phys. Lett. 100, 051902 (2012); http://dx.doi.org/10.1063/1.3673553 (3 pages) | Cited 3 times

Online Publication Date: 1 February 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
The polar surfaces of wurtzite-type zinc oxide (ZnO) were characterized by x-ray photoemission spectroscopy to identify the origin of the polarity dependence of the valence band spectra. A characteristic sub-peak always appeared in the valence band spectra of the (0001) face regardless of the surface preparation conditions. It also appeared in the valence band spectra of the (10math2) face, but only when the photoelectron take-off angle was parallel to the c-axis of ZnO. Our analysis demonstrates that this take-off angle dependency originates not from the surface state, photoelectron diffraction, or the presence of surfactants but from the crystal polarity.
Show PACS
79.60.Bm Clean metal, semiconductor, and insulator surfaces
71.20.Nr Semiconductor compounds
82.80.Pv Electron spectroscopy (X-ray photoelectron (XPS), Auger electron spectroscopy (AES), etc.)
73.20.At Surface states, band structure, electron density of states

Beam-scanning planar lens based on graphene

Hong Ju Xu, Wei Bing Lu, Yun Jiang, and Zheng Gao Dong

Appl. Phys. Lett. 100, 051903 (2012); http://dx.doi.org/10.1063/1.3681799 (4 pages) | Cited 8 times

Online Publication Date: 1 February 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
One of the most important advantages of graphene is the capability of dynamically tuning its conductivity by means of chemical doping or gate voltage. Based on this property, we propose a planar gradient index graphene-based lens transforming spherical waves of the transverse-magnetic (TM) surface plasmon polariton (SPP) wave to plane waves of the TM SPP wave with specific beam deflections. Using numerical simulations, it is confirmed that a single-atomic-layered graphene can be a platform for planar gradient-index lens, which can be applied to modulate the propagation of SPP waves.
Show PACS
42.79.Bh Lenses, prisms and mirrors
42.79.Ls Scanners, image intensifiers, and image converters
78.67.Wj Optical properties of graphene

Time-of-flight-photoelectron emission microscopy on plasmonic structures using attosecond extreme ultraviolet pulses

S. H. Chew (周淑芬), F. Süßmann, C. Späth, A. Wirth, J. Schmidt, S. Zherebtsov, A. Guggenmos, A. Oelsner, N. Weber, J. Kapaldo, A. Gliserin, M. I. Stockman, M. F. Kling, and U. Kleineberg

Appl. Phys. Lett. 100, 051904 (2012); http://dx.doi.org/10.1063/1.3670324 (4 pages) | Cited 2 times

Online Publication Date: 2 February 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We report on the imaging of plasmonic structures by time-of-flight-photoemission electron microscopy (ToF-PEEM) in combination with extreme ultraviolet (XUV) attosecond pulses from a high harmonic generation source. Characterization of lithographically fabricated Au structures using these ultrashort XUV pulses by ToF-PEEM shows a spatial resolution of ∼200 nm. Energy-filtered imaging of the secondary electrons resulting in reduced chromatic aberrations as well as microspectroscopic identification of core and valence band electronic states have been successfully proven. We also find that the fast valence band electrons are not influenced by space charge effects, which is essentially important for attosecond nanoplasmonic-field microscopy realization.
Show PACS
79.20.Hx Electron impact: secondary emission
77.22.Jp Dielectric breakdown and space-charge effects
79.60.-i Photoemission and photoelectron spectra
73.22.Lp Collective excitations

Magnetic shape memory effect in orbital-spin-coupled system MnV2O4

Y. Nii, N. Abe, K. Taniguchi, and T. Arima

Appl. Phys. Lett. 100, 051905 (2012); http://dx.doi.org/10.1063/1.3681581 (3 pages)

Online Publication Date: 2 February 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Magnetic-field(H)-induced shape memory effect without temperature variation is demonstrated by a combination of H-sweep and H-rotation in an orbital-spin-coupled spinel-type insulating system MnV2O4. A rotation of the direction of a magnetic field of 5 T in the low-temperature tetragonal phase gives rise to a large macroscopic strain up to 1%, which stems from a 90° rotation of tetragonal domains. The results show several possible ways of macroscopic shape control in this class of matter, and may open a possibility of high-speed actuators free from the eddy current.
Show PACS
81.40.Lm Deformation, plasticity, and creep
62.20.fg Shape-memory effect; yield stress; superelasticity
81.30.Kf Martensitic transformations

Temperature dependent dynamics of ZnO nanoparticles probed by Raman scattering: A big divergence in the functional areas of nanoparticles and bulk materials

Harish Kumar Yadav, R. S. Katiyar, and Vinay Gupta

Appl. Phys. Lett. 100, 051906 (2012); http://dx.doi.org/10.1063/1.3681144 (5 pages)

Online Publication Date: 2 February 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Temperature dependent Raman scattering of the E2(low) and E2(high) modes of ZnO nanoparticle powder samples has been investigated. The dynamics exhibited by the ZnO nanoparticles, the E2 modes, follow single crystal like behavior but with strong cubic or/and quadratic anharmonicity by supporting additional channels for immediate lattice relaxation. The strong anharmonic character associated with the E2 modes reflects enhanced thermal conductivity of the ZnO nanoparticles. An anomalous variation in linewidth of the E2(low) mode is observed and is attributed to the superposition of the large displacement field, associated with the surface atoms of the nanoparticles and the lattice mode.
Show PACS
63.20.Ry Anharmonic lattice modes
78.30.Fs III-V and II-VI semiconductors
66.70.Df Metals, alloys, and semiconductors

Strong interband transitions in InAs quantum dots solar cell

Jiang Wu, Y. F. M. Makableh, R. Vasan, M. O. Manasreh, B. Liang, C. J. Reyner, and D. L. Huffaker

Appl. Phys. Lett. 100, 051907 (2012); http://dx.doi.org/10.1063/1.3681360 (4 pages) | Cited 6 times

Online Publication Date: 3 February 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Solar cells fabricated from a stack of ten periods of InAs quantum dots sandwiched in a GaAs p-n junction were fabricated and tested. The 300 K photoresponse spectrum exhibits two strong peaks and several weak peaks related to band-to-band transitions within the quantum dots. A few of these peaks were also observed in the photoluminescence and external quantum efficiency spectra. The power conversion efficiency was obtained from the current-voltage characteristics. Surface plasmon effect on the solar cell was investigated by coupling gold nanoparticles to the surface of the device using dithiol ligands with an enhancement on the order of 10%.
Show PACS
88.40.jp Multijunction solar cells

Thermal conductivity and photoluminescence of light-emitting silicon nitride films

Amy Marconnet, Matt Panzer, Selçuk Yerci, Salvatore Minissale, X. Wang, X. Zhang, Luca Dal Negro, and K. E. Goodson

Appl. Phys. Lett. 100, 051908 (2012); http://dx.doi.org/10.1063/1.3682508 (4 pages)

Online Publication Date: 3 February 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Silicon-rich and rare-earth-doped nitride materials are promising candidates for silicon-compatible photonic sources. This work investigates the thermal conductivity and photoluminescence (PL) of light emitting samples fabricated with a range of excess silicon concentrations and annealing temperatures using time-domain picosecond thermoreflectance and time-resolved photoluminescence. A direct correlation between the thermal conductivity and photoluminescence dynamics is demonstrated, as well as a significant reduction of thermal conductivity upon incorporation of erbium ions. These findings highlight the role of annealing and stoichiometry control in the optimization of light emitting microstructures suitable for the demonstration of efficient Si-compatible light sources based on the silicon nitride platform.
Show PACS
66.70.Df Metals, alloys, and semiconductors
78.47.J- Ultrafast spectroscopy (<1 psec)
78.20.N- Thermo-optic effects
78.55.Hx Other solid inorganic materials
81.40.Ef Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization
85.60.Jb Light-emitting devices

A transparent 90° polarization rotator by combining chirality and electromagnetic wave tunneling

Mehmet Mutlu and Ekmel Ozbay

Appl. Phys. Lett. 100, 051909 (2012); http://dx.doi.org/10.1063/1.3682591 (4 pages) | Cited 6 times

Online Publication Date: 3 February 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A three-layer chiral metamaterial is constructed by using two layers of four mutually rotated resonators and a subwavelength mesh sandwiched symmetrically between these layers. The resulting structure is an ultrathin, transparent, and polarization angle independent 90° polarization rotator. Due to the electromagnetic tunneling effect exerted by the negative permittivity mesh, a cross-polarization conversion efficiency of 99% and 93% is achieved numerically and experimentally. The structure is modeled using the effective medium theory and then the transfer matrix method is applied to demonstrate the existence of the tunneling resonance theoretically.
Show PACS
42.70.Nq Other nonlinear optical materials; photorefractive and semiconductor materials
42.79.-e Optical elements, devices, and systems
81.05.Xj Metamaterials for chiral, bianisotropic and other complex media
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close