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23 May 2011

Volume 98, Issue 21, Articles (21xxxx)

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Appl. Phys. Lett. 98, 212504 (2011); http://dx.doi.org/10.1063/1.3593371 (3 pages)

K. Okumura, T. Ishikura, M. Soda, T. Asaka, H. Nakamura, Y. Wakabayashi, and T. Kimura
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High-temperature transport properties of Ca0.98RE0.02MnO3−δ (RE = Sm, Gd, and Dy)

Chia-Jyi Liu, Ankam Bhaskar, and J. J. Yuan

Appl. Phys. Lett. 98, 214101 (2011); http://dx.doi.org/10.1063/1.3593962 (3 pages) | Cited 4 times

Online Publication Date: 24 May 2011

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We report measurements of electrical resistivity and thermopower on CaMnO3−δ and Ca0.98RE0.02MnO3−δ (RE = Sm, Gd, and Dy) prepared by solid state reaction. CaMnO3−δ exhibits nonmetal-like temperature dependence of resistivity while metal-like temperature dependence of thermopower. This inconsistency can be explained by the extrinsic carriers arising from oxygen defects using two-band model. Ca0.98RE0.02MnO3−δ exhibits metal-like temperature dependence in both resistivity and thermopower. The transition to metal-like behavior resembles the case in degenerate semiconductors and can be attributed to an impurity band formation with characteristic of hybridized Mn 3d eg and O 2p states due to electron doping via partial substitution of lanthanides for Ca2+ and oxygen defects.
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72.80.Sk Insulators
72.20.Pa Thermoelectric and thermomagnetic effects

Broadband energy-harvesting using a two degree-of-freedom vibrating body

In-Ho Kim, Hyung-Jo Jung, Bo Mi Lee, and Seon-Jun Jang

Appl. Phys. Lett. 98, 214102 (2011); http://dx.doi.org/10.1063/1.3595278 (3 pages) | Cited 7 times

Online Publication Date: 26 May 2011

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In this letter, we introduce the concept and describe the realization of a two degree-of-freedom piezoelectric energy-harvesting device. The proposed system consists of a proof mass (i.e., a rigid body) and two cantilever beams; it can utilize both translational and rotational degrees of freedom. Therefore, it exhibits double power peaks and an increased frequency bandwidth, and it can generate power more efficiently than conventional vibration-based single degree-of-freedom devices.
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84.60.-h Direct energy conversion and storage
85.50.-n Dielectric, ferroelectric, and piezoelectric devices

Surface-electrode ion trap with integrated light source

Tony Hyun Kim, Peter F. Herskind, and Isaac L. Chuang

Appl. Phys. Lett. 98, 214103 (2011); http://dx.doi.org/10.1063/1.3593496 (3 pages) | Cited 2 times

Online Publication Date: 27 May 2011

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An atomic ion is trapped at the tip of a single-mode optical fiber in a cryogenic (8 K) surface-electrode ion trap. The fiber serves as an integrated source of laser light, which drives the quadrupole qubit transition of 88Sr+. Through in situ translation of the nodal point of the trapping field, the Gaussian beam profile of the fiber output is imaged, and the fiber-ion displacement, in units of the mode waist at the ion, is optimized to within 0.13±0.10 of the mode center despite an initial offset of 3.30±0.10. Fiber-induced charging by 125 μW of 674 nm light is observed to be ∼ 10 V/m at an ion height of 670 μm, with charging and discharging time constants of 1.6±0.3 s and 4.7±0.6 s, respectively. This work is of importance to large-scale, ion-based quantum information processing, where optics integration in surface-electrode designs may be a crucial enabling technology.
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37.10.Vz Mechanical effects of light on atoms, molecules, and ions
42.50.Ex Optical implementations of quantum information processing and transfer
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