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16 Apr 2012

Volume 100, Issue 16, Articles (16xxxx)

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Appl. Phys. Lett. 100, 164101 (2012); http://dx.doi.org/10.1063/1.3702579 (4 pages)

Cheol-Ho Yun, Leslie Y. Yeo, James R. Friend, and Bernard Yan
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Seebeck coefficient of a quantum confined, high-electron-density electron gas in SrTiO3

Tyler A. Cain, SungBin Lee, Pouya Moetakef, Leon Balents, Susanne Stemmer, and S. James Allen

Appl. Phys. Lett. 100, 161601 (2012); http://dx.doi.org/10.1063/1.4704363 (3 pages) | Cited 3 times

Online Publication Date: 16 April 2012

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We report on the Seebeck coefficient of quantum confined electron gases in GdTiO3/SrTiO3 heterostructures. These structures contain two-dimensional electron gases with very high sheet-carrier concentrations on the SrTiO3-side of the interface due to intrinsic interface doping. While the sheet carrier concentrations are independent of the thickness of the SrTiO3 layer, the Seebeck coefficient initially increases with SrTiO3 thickness before saturating at a value of ∼300 μK/V. A model of the Seebeck coefficient, based on thermally populated, self-consistent, tight binding subbands, captures in a semi-quantitative manner the observed thickness dependence.
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72.20.Pa Thermoelectric and thermomagnetic effects
73.40.Lq Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions
71.15.Ap Basis sets (LCAO, plane-wave, APW, etc.) and related methodology (scattering methods, ASA, linearized methods, etc.)
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)

Magnetoexcitons and optical absorption of bilayer-structured topological insulators

Zhigang Wang, Zhen-Guo Fu, and Ping Zhang

Appl. Phys. Lett. 100, 161602 (2012); http://dx.doi.org/10.1063/1.4704657 (4 pages) | Cited 1 time

Online Publication Date: 17 April 2012

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The optical absorption properties of magnetoexcitons in topological insulator bilayers under a strong magnetic field are theoretically studied. A general analytical formula of optical absorption selection rule is obtained in the noninteracting as well as Coulomb intra-Landau-level (LL) interacting cases, which remarkably helps to interpret the resonant peaks in absorption spectroscopy and the corresponding formation of Dirac-type magnetoexcitons. We also discuss the optical absorption spectroscopy of magnetoexcitons in the presence of inter-Landau-level Coulomb interaction, which becomes more complex. We hope our results can be detected in the future magneto-optical experiments.
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71.35.-y Excitons and related phenomena
73.20.At Surface states, band structure, electron density of states

Substrate effect on the electronic structures of CuPc/graphene interfaces

Qi-Hui Wu, Guo Hong, T. W. Ng, and S. T. Lee

Appl. Phys. Lett. 100, 161603 (2012); http://dx.doi.org/10.1063/1.3703766 (4 pages) | Cited 5 times

Online Publication Date: 18 April 2012

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The interfacial electronic structures of copper phthalocyanine (CuPc) deposited on a single-layer graphene (SLG) film prepared on Cu and SiO2 substrates (SLG/Cu and SLG/SiO2) were investigated using ultraviolet photoelectron spectroscopy. The ionization energy of CuPc on SLG/Cu and SLG/SiO2 substrate is, respectively, 5.62 eV and 4.97 eV. The energy level alignments at the two interfaces were estimated. The results revealed that the height of the electron (hole) injection barriers are 1.20 (1.10) and 1.38 (0.92) eV at CuPc/SLG/Cu and CuPc/SLG/SiO2 interfaces, respectively.
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73.20.At Surface states, band structure, electron density of states
68.35.Ct Interface structure and roughness
79.60.Jv Interfaces; heterostructures; nanostructures
82.80.Pv Electron spectroscopy (X-ray photoelectron (XPS), Auger electron spectroscopy (AES), etc.)
81.15.Gh Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.)
71.20.-b Electron density of states and band structure of crystalline solids
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