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5 Sep 2005

Volume 87, Issue 10, Articles (10xxxx)

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Appl. Phys. Lett. 87, 101107 (2005); http://dx.doi.org/10.1063/1.2039987 (3 pages)

A. David, C. Meier, R. Sharma, F. S. Diana, S. P. DenBaars, E. Hu, S. Nakamura, C. Weisbuch, and H. Benisty
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Optical nonlinearity induced by exciton-biexciton coherent effects in InGaAs quantum dots

Hideki Gotoh, Hidehiko Kamada, Hidetoshi Nakano, Tadashi Saitoh, Hiroaki Ando, and Jiro Temmyo

Appl. Phys. Lett. 87, 102101 (2005); http://dx.doi.org/10.1063/1.2035327 (3 pages) | Cited 2 times

Online Publication Date: 29 August 2005

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We report on large optical nonlinear effects induced by coherent interactions between excitons and biexcitons in quantum dots. The absorption spectra in an exciton–biexciton system are measured in InGaAs quantum dots by using single dot spectroscopy. The spectra exhibit unusual shapes that have a transparent region under a strong excitation condition. A pump–probe measurement ensures that the exciton state is erased by a quantum interference effect with exciton and biexciton photoabsorption processes. These results suggest that optical functions such as electromagnetically induced transparency are feasible with excitons and biexcitons in quantum dots.
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78.67.Hc Quantum dots
71.35.Cc Intrinsic properties of excitons; optical absorption spectra
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
78.40.Fy Semiconductors
42.65.-k Nonlinear optics

Tunable entanglement generation for mobile-electron spin qubits

A. I. Signal and U. Zülicke

Appl. Phys. Lett. 87, 102102 (2005); http://dx.doi.org/10.1063/1.2041821 (3 pages) | Cited 11 times

Online Publication Date: 30 August 2005

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Recent studies have shown that linear electron optics can be used to generate entangled two-particle states from nonentangled ones if additional measurements of charge or parity are performed. We have investigated such nondeterministic entanglement production in electronic versions of the Mach-Zehnder interferometer, where spin-dependent interference occurs due to the presence of electric-field tunable Rashba spin splitting. Adjustment of the spin-precession length turns out to switch the entangler on and off, as well as control the detailed form of entangled output states.
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03.67.Mn Entanglement measures, witnesses, and other characterizations
42.50.-p Quantum optics

Interface band gap engineering in InAsSb photodiodes

M. Carras, J. L. Reverchon, G. Marre, C. Renard, B. Vinter, X. Marcadet, and V. Berger

Appl. Phys. Lett. 87, 102103 (2005); http://dx.doi.org/10.1063/1.2041818 (3 pages) | Cited 11 times

Online Publication Date: 1 September 2005

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The optimization of an InAs0.91Sb0.09 based infrared detector has been performed. The importance of the interfaces between the active region and the contacts in generation recombination phenomena is demonstrated. The two sides of the active region are optimized independently through heterostructure band gap engineering. The use of an Al0.15In0.85As0.91Sb0.09 quaternary makes it possible reach a detectivity of 4.4×109 cm √Hz/W at 290 K and 1.4×1010 cm √Hz/W at 250 K at 3.39 μm, offering the perspective of a noncryogenic infrared imaging in the 3–5 μm band with quantum detectors.
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85.60.Dw Photodiodes; phototransistors; photoresistors
85.60.Gz Photodetectors (including infrared and CCD detectors)
73.40.Kp III-V semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions

BaTiO3–(Bi1/2Na1/2)TiO3 solid-solution semiconducting ceramics with Tc>130 °C

Hiroaki Takeda, Wataru Aoto, and Tadashi Shiosaki

Appl. Phys. Lett. 87, 102104 (2005); http://dx.doi.org/10.1063/1.2042551 (3 pages) | Cited 31 times

Online Publication Date: 2 September 2005

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As a candidate of a lead-free positive temperature coefficient of resistivity (PTCR) material, barium titanate (BaTiO3)-based solid-solution ceramics, Ba1−x(Bi1/2Na1/2)xTiO3 with x = 0.05 (BBNT5), have been synthesized by an ordinary sintering technique. Temperature dependences of the dielectric and ferroelectric properties show ferroelectric and paraelectric phase transition of the ceramics with the Curie temperature of Tc = 170 °C, which is higher than that of BaTiO3 (130°C). The La-doped BBNT5 ceramics display low ρ values of 102–103 Ω cm at room temperature and their abrupt changes of 102–104 at about 220 °C. The reduced BBNT5 ceramics show small PTCR characteristics compared to the La-doped ones.
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77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.80.B- Phase transitions and Curie point
72.80.Jc Other crystalline inorganic semiconductors
81.20.Ev Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
81.05.Je Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides)
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