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20 Feb 2012

Volume 100, Issue 8, Articles (08xxxx)

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Appl. Phys. Lett. 100, 082401 (2012); http://dx.doi.org/10.1063/1.3684972 (4 pages)

Elizabeth Rapoport and Geoffrey S. D. Beach
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Impact of structural transitions on electron transport at LaAlO3/SrTiO3 heterointerfaces

Frank Schoofs, Mehmet Egilmez, Thomas Fix, Judith L. MacManus-Driscoll, and Mark G. Blamire

Appl. Phys. Lett. 100, 081601 (2012); http://dx.doi.org/10.1063/1.3687706 (4 pages) | Cited 2 times

Online Publication Date: 21 February 2012

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We have studied conductive LaAlO3/SrTiO3 heterostructures deposited at different oxygen pressures. Photoluminescence spectra confirm the presence of a significant amount of oxygen vacancies in samples deposited at low oxygen pressures. Power law fitting of resistance versus temperature measurements reveals fundamental characteristics of the conduction mechanism at the interface. A distinct non-Fermi-liquid behavior is observed for samples grown in higher oxygen pressure, which give two-dimensionally confined conducting interfaces, whereas characteristic electron-electron scattering is observed for samples grown in lower oxygen pressures, as seen in bulk doped SrTiO3 (i.e., oxygen deficient SrTiO3). Transitions between different conduction modes occur throughout the studied temperature range (10–270 K) as a result of structural transformations in the near-surface region of the SrTiO3.
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81.30.Hd Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder
61.72.jd Vacancies
64.70.K- Solid-solid transitions
78.55.-m Photoluminescence, properties and materials

Chiral recognition of zinc phthalocyanine on Cu(100) surface

Feng Chen, Xiu Chen, Lacheng Liu, Xin Song, Shuyi Liu, Juan Liu, Hongping Ouyang, Yingxiang Cai, Xiaoqing Liu, Haibing Pan, Junfa Zhu, and Li Wang

Appl. Phys. Lett. 100, 081602 (2012); http://dx.doi.org/10.1063/1.3685713 (4 pages) | Cited 2 times

Online Publication Date: 21 February 2012

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The windmill-like chiral nature of individual ZnPc molecules adsorbed on Cu(100) surface at room temperature has been revealed by scanning tunneling microscopy (STM) and the origin of such chirality is attributed to asymmetrical charge transfer between the molecules and the copper surface. Such chiral enantiomers do recognize each other in molecular level and spontaneously form second-level chiral supramolecular structures with the same chirality during thermally driven movements. The interactions between the ZnPc molecules during such chiral recognition process have been discussed based on the analysis of the sub-molecule-resolution STM images.
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68.43.Mn Adsorption kinetics
82.30.Fi Ion-molecule, ion-ion, and charge-transfer reactions

Magnetic and electronic properties of the interface between half metallic Fe3O4 and semiconducting ZnO

S. Brück, M. Paul, H. Tian, A. Müller, D. Kufer, C. Praetorius, K. Fauth, P. Audehm, E. Goering, J. Verbeeck, G. Van Tendeloo, M. Sing, and R. Claessen

Appl. Phys. Lett. 100, 081603 (2012); http://dx.doi.org/10.1063/1.3687731 (4 pages) | Cited 3 times

Online Publication Date: 22 February 2012

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We have investigated the magnetic depth profile of an epitaxial Fe3O4 thin film grown directly on a semiconducting ZnO substrate by soft x-ray resonant magnetic reflectometry (XRMR) and electron energy loss spectroscopy (EELS). Consistent chemical profiles at the interface between ZnO and Fe3O4 are found from both methods. Valence selective EELS and XRMR reveal independently that the first monolayer of Fe at the interface between ZnO and Fe3O4 contains only Fe3+ ions. Besides this narrow 2.5 Å interface layer, Fe3O4 shows magnetic bulk properties throughout the whole film making highly efficient spin injection in this system feasible.
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81.05.Bx Metals, semimetals, and alloys
81.05.Dz II-VI semiconductors
79.20.Uv Electron energy loss spectroscopy
75.76.+j Spin transport effects
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.70.Ak Magnetic properties of monolayers and thin films

Droplet jumping by electrowetting and its application to the three-dimensional digital microfluidics

Seung Jun Lee, Sanghyun Lee, and Kwan Hyoung Kang

Appl. Phys. Lett. 100, 081604 (2012); http://dx.doi.org/10.1063/1.3688487 (3 pages) | Cited 1 time

Online Publication Date: 23 February 2012

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We introduce droplet jumping by electrowetting (DJE), which stretches droplets to store energy for jumping by electrowetting. The capillarity-driven droplet jumping is effective to overcome the energy barrier, where the threshold for jumping is less than 100 V. We studied the detailed jumping mechanisms with regard to the jumping height and the energy conversion and demonstrated the transport of sessile droplets to upper surfaces under diverse electrode configurations. While the droplet jumping on the superhydrophobic surface is the primary focus of our research, DJE is also found to be possible on conventional Teflon surfaces, envisioning the three-dimensional droplet-based digital microfluidics.
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68.08.Bc Wetting
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