Erratum: “Multicolor and near-infrared electroluminescence from the light-emitting devices with rare-earth doped TiO2 films” [Appl. Phys. Lett. 107, 131103 (2015)]
(Source: Applied Physics Letters)
Source: Applied Physics Letters - November 10, 2016 Category: Physics Authors: Chen Zhu, Chunyan Lv, Zhifei Gao, Canxing Wang, Dongsheng Li, Xiangyang Ma and Deren Yang Source Type: research
Erratum: “Increase in elastic anisotropy of single crystal tungsten upon He-ion implantation measured with laser-generated surface acoustic waves” [Appl. Phys. Lett. 109, 151906 (2016)]
(Source: Applied Physics Letters)
Source: Applied Physics Letters - November 10, 2016 Category: Physics Authors: R. A. Duncan, F. Hofmann, A. Vega-Flick, J. K. Eliason, A. A. Maznev, A. G. Every and K. A. Nelson Source Type: research
Publisher's Note: “Epitaxial growth and physical properties of ternary nitride thin films by polymer-assisted deposition” [Appl. Phys. Lett. 109, 081907 (2016)]
(Source: Applied Physics Letters)
Source: Applied Physics Letters - November 10, 2016 Category: Physics Authors: Erik Enriquez, Yingying Zhang, Aiping Chen, Zhenxing Bi, Yongqiang Wang, Engang Fu, Zachary Harrell, Xujie L ü, Paul Dowden, Haiyan Wang, Chonglin Chen and Quanxi Jia Source Type: research
Soft X-ray emission from molybdenum plasmas generated by dual laser pulses
We demonstrate efficient enhancement ofsoft X-ray(SXR) emission frommolybdenumplasmas produced using dual pulseirradiation, in which 10-ns and 150-ps pre-pulses were followed by a 150-ps main pulse. The number of photons was observed to be 5.3 × 1016 photons/sr, which corresponded to a conversion efficiency of 1.5%/sr inλ = 2.34–4.38 nm region at a pulse separation time of 1 ns with the 150-ps pre-pulse. The conversion efficiency became 1.3 times as large as that produced by a single pulse. The results indicate the advantage of dual pulseirradiation using sub-ns pre-and main pulses to produce the brightpla...
Source: Applied Physics Letters - November 10, 2016 Category: Physics Authors: Ragava Lokasani, Goki Arai, Yoshiki Kondo, Hiroyuki Hara, Thanh-Hung Dinh, Takeo Ejima, Tadashi Hatano, Weihua Jiang, Tetsuya Makimura, Bowen Li, Padraig Dunne, Gerry O'Sullivan, Takeshi Higashiguchi and Jiri Limpouch Source Type: research
Evanescent vortex: Optical subwavelength spanner
Conventional optical spanners based on free-space focusedvortex beams are very difficult to manipulate subwavelength objects due to thediffraction limit, while optical subwavelength spanners are not explored.Evanescent wave is one potential tool to realize subwavelength trapping. By combiningvortex with evanescent field, we find that the evanescentvortex can function as an optical subwavelength spanner. We investigate the factors that will affect the generation/function of this subwavelength spanner, including numerical aperture and topological charge. Further, by calculating the optical force and potential on the illumina...
Source: Applied Physics Letters - November 9, 2016 Category: Physics Authors: Shengtao Mei, Kun Huang, Tianhang Zhang, Muhammad Qasim Mehmood, Hong Liu, Chwee Teck Lim, Jinghua Teng and Cheng-Wei Qiu Source Type: research
Enhanced electrical conductivity and diluted Ir4+ spin orders in electron doped iridates Sr2 –xGaxIrO4
Sr2IrO4 represents a fascinating system to study comparable electronic correlations and spin-orbit couplings, and recently attracts considerable attention in high-temperature superconductivity. Here, we report on the transport and magnetic properties in gallium-doped Sr2IrO4. A metallic state is discovered whendopingx is over 0.1, which could be understood in terms of the quickly decreasedenergy gap and increasedcarrier concentration. In addition to the high-temperature magnetictransition (TC > 200 K), a low-temperature one (TC′) is also observed for thex = 0.05–0.10 samples. Both of the magnetic states are f...
Source: Applied Physics Letters - November 9, 2016 Category: Physics Authors: Tao Han, Yongjian Wang, Jun Yang, Lei He, Junmin Xu, Dandan Liang, Hui Han, M. Ge, C. Y. Xi, W. K. Zhu, Changjin Zhang and Yuheng Zhang Source Type: research
Low-damping sub-10-nm thin films of lutetium iron garnet grown by molecular-beam epitaxy
We analyze the structural and magnetic characteristics of (111)-oriented lutetium irongarnet (Lu3Fe5O12)filmsgrown bymolecular-beam epitaxy, forfilms as thin as 2.8 nm. Thickness-dependent measurements of the in- and out-of-plane ferromagnetic resonance allow us to quantify the effects of two-magnon scattering, along with the surface anisotropy and the saturation magnetization. We achieve effective damping coefficients of11.1(9)×10−4 for 5.3 nmfilms and32(3)×10−4 for 2.8 nmfilms, among the lowest values reported to date for any insulating ferrimagnetic sample of comparable thickness. (Source: Applied Physics Letters)
Source: Applied Physics Letters - November 9, 2016 Category: Physics Authors: C. L. Jermain, H. Paik, S. V. Aradhya, R. A. Buhrman, D. G. Schlom and D. C. Ralph Source Type: research
Tunnel magnetoresistance in epitaxial (100)-oriented FeCo/LiF/FeCo magnetic tunnel junctions
We fabricated fullyepitaxialmagnetic tunnel junctions with LiF tunnel barriers on Si (100) substrates with high-vacuumelectron-beam deposition. By changing the thickness of the LiF barrier, tunnelmagnetoresistance of up to 90% at 77 K (17% at room temperature) was observed attLiF = 2.8 nm. Themagnetoresistance ratio as a function of the LiF barrier thickness shows a similar trend with that inmagnetic tunnel junctions usingepitaxial MgO barriers. There is a rapid decrease of themagnetoresistance ratio with increasing bias-voltage and temperature, indicating the presence of imperfections in the LiF barriers. (Source...
Source: Applied Physics Letters - November 9, 2016 Category: Physics Authors: Qian Xue, Yihang Yang, Zhiwei Gao, Fen Liu, Qiang Li, Shandong Li and Guo-Xing Miao Source Type: research
Engineering quantum spin Hall insulators by strained-layer heterostructures
Quantum spin Hallinsulators (QSHIs), also known as two-dimensional topologicalinsulators, have emerged as an unconventional class of quantum states with insulating bulk and conducting edges originating from nontrivial inverted band structures and have been proposed as a platform for exploring spintronics applications and exotic quasiparticles related to the spin-helical edge modes. Despite theoretical proposals for various materials, however, experimental demonstrations of QSHIs have so far been limited to two systems —HgTe/CdTe and InAs/GaSb—both of which are lattice-matched semiconductorheterostructures. Here, we rep...
Source: Applied Physics Letters - November 9, 2016 Category: Physics Authors: T. Akiho, F. Cou ëdo, H. Irie, K. Suzuki, K. Onomitsu and K. Muraki Source Type: research
Atomistic simulation on the plastic deformation and fracture of bio-inspired graphene/Ni nanocomposites
Molecular dynamics simulations were performed to investigate theplastic deformation and fracture behaviors of bio-inspired graphene/metalnanocomposites, which have a “brick-and-mortar” nanostructure, consisting of hardgraphene single-layers embedded in a softNi matrix. Theplastic deformation mechanisms of thenanocomposites were analyzed as well as their effects on the mechanical properties with various geometrical variations. It was found that the strength andductility of the metal matrix can be highly enhanced with the addition of the staggeredgraphene layers, and theplastic deformation can be attributed to the interf...
Source: Applied Physics Letters - November 9, 2016 Category: Physics Authors: Zhenyu Yang, Dandan Wang, Zixing Lu and Wenjun Hu Source Type: research
Generation and detection of thermoelastic waves in metals by a photothermal mirror method
We investigate the thermoelasticwaves launched by a localized heat deposition. Pulsed laser excitation is used to generate mechanical perturbations in metals that aredetected using thephotothermalmirror method. This methoddetects the wavefront distortion of the probe beam reflected from the perturbed sample surface. Nanometer scale expansion of the material is induced just under the irradiated surface releasing transient thermoelasticwaves of much smaller amplitudes on the surface. Numerical predictions and the experimental results are in a good agreement and represent both the thermal diffusion of the large amplitude, lon...
Source: Applied Physics Letters - November 9, 2016 Category: Physics Authors: O. A. Capeloto, V. S. Zanuto, G. V. B. Lukasievicz, L. C. Malacarne, S. E. Bialkowski, T. Po žar and N. G. C. Astrath Source Type: research
Exchange coupled Mn-Mn pair: An approach for super-broadband 1380 nm emission in α-MnS
Super-broadbandnear-infrared(NIR) emission centered at 1380 nm with a full width at half maximum of 161 nm and a decay lifetime of 241 μs has been demonstrated in α-MnS. We find that theNIR emission originates from exchange coupled Mn-Mn pairs in α-MnS based on the detail analysis ofphotoluminescence excitationspectra, transientspectra, temperature dependentphotoluminescencespectra as well as thecrystal structure of α-MnS. Mechanism ofexchange interaction between nearest-neighbor Mn2+ ions is discussed in detail. The finding offers the possibilities of designingNIR emitting source for various photonic applicatio...
Source: Applied Physics Letters - November 9, 2016 Category: Physics Authors: Z. T. Chen, E. H. Song, M. Wu, B. Zhou and Q. Y. Zhang Source Type: research
Electrorotation of a metallic coated Janus particle under AC electric fields
Electrorotations (EROTs) of the Pt-silica Janus particles are measured in different conditions under rotatingelectric fields. Unlike simple particles, we find that the rotation direction of a Janus particle is mainly opposite to the direction of theelectric field (counter-field), which is similar to the metallic particles, while the rotation direction may reverse from counter-field to co-field at the low-frequency region (1 MHz), depending on the thickness ofmetallic coating and conductivities of solutions. We also find that EROT of a Janus particle reaches a maximum angular speed at acharacteristic frequency, which increa...
Source: Applied Physics Letters - November 9, 2016 Category: Physics Authors: Yu-Liang Chen and Hong-Ren Jiang Source Type: research
Reversible tuning of two-dimensional electron gases in oxide heterostructures by chemical surface modification
Reversible control over the electricalproperties of the two-dimensionalelectron gas(2DEG) in oxideheterostructures is a key capability enabling practical applications. Herein, we report an efficient method to reversibly tune the chargecarrier density of the2DEG bysurface modification. We demonstrate both increasing and decreasing thecarrier density of the LaAlO3/SrTiO32DEG interfacevia application of functional phosphonicacids with molecular dipoles pointing either toward or away from the interface, respectively. In addition, in the case of the enhanced2DEG, we recovered the initial conductionproperties by exposing the sam...
Source: Applied Physics Letters - November 9, 2016 Category: Physics Authors: H. Lee, N. Campbell, S. Ryu, W. Chang, J. Irwin, S. Lindemann, M. K. Mahanthappa, M. S. Rzchowski and C. B. Eom Source Type: research
Ultrathin IBAD MgO films for epitaxial growth on amorphous substrates and sub-50 nm membranes
A fabrication process has been developed for high energyion beam assisted deposition (IBAD) biaxial texturing of ultrathin ( ∼1 nm) MgOfilms, using a high ion-to-atom ratio and post-deposition annealing instead of ahomoepitaxial MgO layer. Thesefilms serve as the seed layer forepitaxialgrowth of materials on amorphous substrates such as electron/X-ray transparent membranes or nanocalorimetry devices. Stress measurements andatomic force microscopy of the MgOfilms reveal decreased stress andsurface roughness, whileX-ray diffraction ofepitaxial overlayers demonstrates the improved crystal quality offilmsgrown epitaxially ...
Source: Applied Physics Letters - November 9, 2016 Category: Physics Authors: Siming Wang, C. Antonakos, C. Bordel, D. S. Bouma, P. Fischer and F. Hellman Source Type: research
