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| Record 1 of 9 |
| Author(s): Liu, JQ (Liu, Junqi); Kong, N (Kong, Ning); Li, L (Li, Lu); Liu, FQ (Liu, Fengqi); Wang, LJ (Wang, Lijun); Chen, JY (Chen, Jianyan); Wang, ZG (Wang, Zhanguo) |
| Title: High resistance AlGaAs/GaAs quantum cascade detectors grown by solid source molecular beam epitaxy operating above liquid nitrogen temperature |
| Source: SEMICONDUCTOR SCIENCE AND TECHNOLOGY, 25 (7): Art. No. 075011 JUL 2010 |
| Abstract: Quantum cascade detectors in the AlGaAs/GaAs material system have been grown by solid source molecular beam epitaxy. The growth direction of the active region is chosen carefully due to the existence of a doping concentration grade along the epilayers. For a 200 x 200 mu m(2) square mesa device, the detector operates above 90 K with a peak detection wavelength of 8.81 mu m, and exhibits a high R(0)A about 4.5 x 10(6) Omega cm(2) and a high Johnson noise limited detectivity D-J* about 3.9 x 10(10) Jones at this temperature. |
| ISSN: 0268-1242 |
| Article Number: 075011 |
| DOI: 10.1088/0268-1242/25/7/075011 |
| Record 2 of 9 |
| Author(s): Wang, SJ (Wang, Shi-Jiang); Yang, YD (Yang, Yue-De); Huang, YZ (Huang, Yong-Zhen) |
| Title: Analysis of coupled microcircular resonators coupled to a bus waveguide with high output efficiency |
| Source: OPTICS LETTERS, 35 (12): 1953-1955 JUN 15 2010 |
| Abstract: Coupled microcircular resonators tangentially coupled to a bus waveguide, which is between the resonators, are numerically investigated by the finite-difference time-domain technique. For symmetrically coupled microcircular resonators with refractive index of 3.2, radius of 2 mu m, and width of the bus waveguide of 0.4 mu m, a mode Q factor of the order of 105 is obtained for a mode at the frequency of 243 THz. An output coupling efficiency of as high as 0.99 is calculated for a mode with a Q factor ranging from 10(3) to 10(4). The mode Q factor is 2 orders larger than that of the modes confined in a single circular resonator tangentially coupled to the same bus waveguide. Furthermore, the high Q traveling modes in the coupled microcircular resonators are suitable for optical single processing. (C) 2010 Optical Society of America |
| ISSN: 0146-9592 |
| Record 3 of 9 |
| Author(s): Tang, AW (Tang, Aiwei); Qu, SC (Qu, Shengchun); Li, K (Li, Kai); Hou, YB (Hou, Yanbing); Teng, F (Teng, Feng); Cao, J (Cao, Jie); Wang, YS (Wang, Yongsheng); Wang, ZG (Wang, Zhanguo) |
| Title: One-pot synthesis and self-assembly of colloidal copper(I) sulfide nanocrystals |
| Source: NANOTECHNOLOGY, 21 (28): Art. No. 285602 JUL 16 2010 |
| Abstract: A simple one-pot method is developed to prepare size-and shape-controlled copper(I) sulfide (Cu2S) nanocrystals by thermolysis of a mixed solution of copper acetylacetonate, dodecanethiol and oleylamine at a relatively high temperature. The crystal structure, chemical composition and morphology of the as-obtained products are characterized by powder x-ray diffraction (PXRD), x-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The morphology and size of the Cu2S nanocrystals can be easily controlled by adjusting the reaction parameters. The Cu2S nanocrystals evolve from spherical to disk-like with increasing reaction temperature. The spherical Cu2S nanocrystals have a high tendency to self-assemble into close-packed superlattice structures. The shape of the Cu2S nanodisks changes from cylinder to hexagonal prism with prolonged reaction time, accompanied by the diameter and thickness increasing. More interestingly, the nanodisks are inclined to self-assemble into face-to-face stacking chains with different lengths and orientations. This one-pot approach may extend to synthesis of other metal sulfide nanocrystals with different shapes and sizes. |
| ISSN: 0957-4484 |
| Article Number: 285602 |
| DOI: 10.1088/0957-4484/21/28/285602 |
| Record 4 of 9 |
| Author(s): Wang, J (Wang, Jing); Liu, Y (Liu, Ying); Li, YC (Li, You-Cheng) |
| Title: Au@Si-n: Growth behavior, stability and electronic structure |
| Source: PHYSICS LETTERS A, 374 (27): 2736-2742 JUN 14 2010 |
| Abstract: The configurations, stability, and electronic structure of AuSin (n = 1-16) clusters have been investigated within the framework of the density functional theory at the B3PW91/LanL2DZ and PW91/DNP levels. The results show that the Au atom begins to occupy the interior site for cages as small as Si-11 and for Si-12 the Au atom completely falls into the interior site forming Au@Si-12 cage. A relatively large embedding energy and small HOMO-LUMO gap are also found for this Au@Si-12 structure indicating enhanced chemical activity and good electronic transfer properties. All these make Au@Si-12 attractive for cluster-assembled materials. (C) 2010 Elsevier B.V. All rights reserved. |
| ISSN: 0375-9601 |
| DOI: 10.1016/j.physleta.2010.04.068 |
| Record 5 of 9 |
| Author(s): Zhang, LB (Zhang, L. B.); Zhai, F (Zhai, Feng); Chang, K (Chang, Kai) |
| Title: Electron tunneling through a planar single barrier in HgTe quantum wells with inverted band structures |
| Source: PHYSICAL REVIEW B, 81 (23): Art. No. 235323 JUN 21 2010 |
| Abstract: We present a theoretical study on the electron tunneling through a single barrier created in a two-dimensional electron gas (2DEG) and quantum spin Hall (QSH) bar in a HgTe/CdTe quantum well with inverted band structures. For the 2DEG, the transmission shows the Fabry-Perot resonances for the interband tunneling process and is blocked when the incident energy lies in the bulk gap of the barrier region. For the QSH bar, the transmission gap is reduced to the edge gap caused by the finite size effect. Instead, transmission dips appear due to the interference between the edge states and the bound states originated from the bulk states. Such a Fano-like resonance leads to a sharp dip in the transmission which can be observed experimentally. |
| ISSN: 1098-0121 |
| Article Number: 235323 |
| DOI: 10.1103/PhysRevB.81.235323 |
| Record 6 of 9 |
| Author(s): Wang, BT (Wang, Bao-Tian); Zhang, P (Zhang, Ping); Song, HZ (Song, Hongzhou); Shi, HL (Shi, Hongliang); Li, DF (Li, Dafang); Li, WD (Li, Wei-Dong) |
| Title: Structural, mechanical, thermodynamic, and electronic properties of thorium hydrides from first-principles |
| Source: JOURNAL OF NUCLEAR MATERIALS, 401 (1-3): 124-129 JUN 2010 |
| Abstract: We perform first-principles calculations of the structural, electronic, mechanical, and thermodynamic properties of thorium hydrides (ThH2 and Th4H15) based on the density functional theory with generalized gradient approximation. The equilibrium geometries, the total and partial densities of states, charge density, elastic constants, elastic moduli, Poisson's ratio, and phonon dispersion curves for these materials are systematically investigated and analyzed in comparison with experiments and previous calculations. These results show that our calculated equilibrium structural parameters are well consistent with experiments. The Th-H bonds in all thorium hydrides exhibit weak covalent character, but the ionic properties for ThH2 and Th4H15 are different due to their different hydrogen concentration. It is found that while in ThH2 about 1.5 electrons transfer from each Th atom to H, in Th4H15 the charge transfer from each Th atom is around 2.1 electrons. Our calculated phonon spectrum for the stable body-centered tetragonal phase of ThH2 accords well with experiments. In addition we show that ThH2 in the fluorite phase is mechanically and dynamically unstable. (C) 2010 Elsevier B.V. All rights reserved. |
| ISSN: 0022-3115 |
| DOI: 10.1016/j.jnucmat.2010.04.009 |
| Record 7 of 9 |
| Author(s): Lu, J (Lu, J.); Meng, HJ (Meng, H. J.); Zhu, K (Zhu, K.); Chen, L (Chen, L.); Xu, PF (Xu, P. F.); Xie, Z (Xie, Z.); Zhao, JH (Zhao, J. H.) |
| Title: Structure and magnetic property of (Ga,Cr)As films with different Cr contents |
| Source: EPL, 89 (6): Art. No. 67003 MAR 2010 |
| Abstract: We report variations in structure and magnetic property of (Ga,Cr) As films with increasing Cr content x. Due to phase segregation, a tendency towards inhomogeneous distribution with increasing x is confirmed. Barkhausen-like magnetization and large remanent magnetic moment were also clearly observed in the samples with x<5.3%. However, spin-glass-like behaviors were observed in both dc and ac magnetic measurements, which might originate from the competition between magnetic nucleation and frustration of long ferromagnetic order in this inhomogeneous system. All the samples exhibit characteristics of variable-range hopping conductivity at temperature below 150 K. Typical magnetic circular dichroism structure was observed in the sample with x=7.9%. Copyright (C) EPLA, 2010 |
| ISSN: 0295-5075 |
| Article Number: 67003 |
| DOI: 10.1209/0295-5075/89/67003 |
| Record 8 of 9 |
| Author(s): Gong, M (Gong, Ming); Chen, G (Chen, Geng); He, LX (He, Lixin); Li, CF (Li, Chuan-Feng); Tang, JS (Tang, Jian-Shun); Sun, FW (Sun, Fang-Wen); Niu, ZC (Niu, Zhi-Chuan); Huang, SS (Huang, She-Song); Xiong, YH (Xiong, Yong-Hua); Ni, HQ (Ni, Hai-Qiao); Guo, GC (Guo, Guang-Can) |
| Title: Direct observation of excitonic polaron in InAs/GaAs quantum dots |
| Source: EPL, 90 (3): Art. No. 37004 MAY 2010 |
| Abstract: We report a direct observation of excitonic polaron in InAs/GaAs quantum dots using the photoluminescence (PL) spectroscopy. We observe that a new peak s' emerges below the s-shell which has anomalous temperature dependence emission energy. The peak s' anticrosses with s at a certain temperature, with a large anticrossing gap up to 31 meV. The behavior of the new peak, which cannot be interpreted using Huang-Rhys model, provides a direct evidence for strong coupling between exciton and LO phonons, and the formation of the excitonic polaron. The strong coupling between exciton and phonons opens a way to coherently control the polaron states. Copyright (C) EPLA, 2010 |
| ISSN: 0295-5075 |
| Article Number: 37004 |
| DOI: 10.1209/0295-5075/90/37004 |
| Record 9 of 9 |
| Author(s): Che, KJ (Che, K. -J.); Lin, JD (Lin, J. -D.); Huang, YZ (Huang, Y. -Z.); Yang, YD (Yang, Y. -D.); Du, Y (Du, Y.) |
| Title: Two-port InGaAsP/InP square resonator microlasers |
| Source: ELECTRONICS LETTERS, 46 (8): 585-U62 APR 15 2010 |
| Abstract: Two-port InGaAsP/InP square resonator microlasers with a side length of 20 mm have been fabricated by the planar technology process, which have two 1 mu m-wide output ports connected to the vertices of the square resonator. Continuous-wave electrically injected microsquare lasers have been realised at room temperature with mode Q-factors of 1.75 x 10(4) at the threshold current. |
| ISSN: 0013-5194 |
| DOI: 10.1049/el.2010.0588 |
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