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RISS 인기검색어
- 검색키워드
- 저자 : Erik P. A. M. Bakkers (검색결과 4 건)
- 무료
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Andreev reflection versus Coulomb blockade in hybrid semiconductor nanowire devices.
Doh, Yong-Joo,De Franceschi, Silvano,Bakkers, Erik P A M,Kouwenhoven, Leo P American Chemical Society 2008 NANO LETTERS Vol.8 No.12
<P>Semiconductor nanowires provide promising low-dimensional systems for the study of quantum transport phenomena in combination with superconductivity. Here we investigate the competition between the Coulomb blockade effect, Andreev reflection, and quantum interference, in InAs and InP nanowires connected to aluminum-based superconducting electrodes. We compare three limiting cases depending on the tunnel coupling strength and the characteristic Coulomb interaction energy. For weak coupling and large charging energies, negative differential conductance is observed as a direct consequence of the BCS density of states in the leads. For intermediate coupling and charging energy smaller than the superconducting gap, the current-voltage characteristic is dominated by Andreev reflection and Coulomb blockade produces an effect only near zero bias. For almost ideal contact transparencies and negligible charging energies, we observe universal conductance fluctuations whose amplitude is enhanced because of Andreev reflection at the contacts.</P>
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Superconducting junctions of InAs semiconductor nanowires
도용주,Jorden A. van Dam,Erik P. A. M. Bakkers,Leo P. Kouwenhoven 한국초전도학회 2008 Progress in superconductivity Vol.9 No.2
InAs semiconductor nanowires can provide a promising plat ting quantum circuit, which exploits tunable supercurrent under the operation of gate voltage. We report temperature and magnetic field dependence of the nanowire superconducting junctions, which is in agreement with the proximity-effect theory of superconductor-normal metal-superconductor weak link. Superconducting coherence length of the InAs nanowire is estimated from the fit and magnetic-field dependence of the critical current and the subgap structure of dI/dV is discussed as well.
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Quantum Interference Eects in InAs Semiconductor Nanowires
도용주,Aarnoud L. Roest,Erik P. A. M. Bakkers,Silvano De Franceschi,Leo P. Kouwenhoven 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1
We report quantum interference eects in InAs semiconductor nanowires strongly coupled to superconducting electrodes. In the normal state, universal conductance uctuations are investigated as a function of the magnetic eld, the temperature, the bias and the gate voltage. The results are found to be in good agreement with theoretical predictions for weakly disordered one-dimensional conductors. In the superconducting state, the uctuation amplitude is enhanced by a factor up to ~1.6, which is attributed to a doubling of the charge transport via Andreev re ection. At a temperature of 4.2 K, well above the Thouless temperature, conductance uctuations are almost entirely suppressed and the nanowire conductance exhibits anomalous quantization in steps of e^2/h. We report quantum interference eects in InAs semiconductor nanowires strongly coupled to superconducting electrodes. In the normal state, universal conductance uctuations are investigated as a function of the magnetic eld, the temperature, the bias and the gate voltage. The results are found to be in good agreement with theoretical predictions for weakly disordered one-dimensional conductors. In the superconducting state, the uctuation amplitude is enhanced by a factor up to ~1.6, which is attributed to a doubling of the charge transport via Andreev re ection. At a temperature of 4.2 K, well above the Thouless temperature, conductance uctuations are almost entirely suppressed and the nanowire conductance exhibits anomalous quantization in steps of e^2/h.
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Superconducting Junctions of InAs Semiconductor Nanowires
Doh, Yong-Joo,Franceschi, Silvano De,van Dam, Jorden A.,Bakkers, Erik P. A. M.,Kouwenhoven, Leo P. The Korean Superconductivity Society 2008 Progress in superconductivity Vol.9 No.2
InAs semiconductor nanowires can provide a promising platform to integrate superconducting quantum circuit, which exploits tunable supercurrent under the operation of gate voltage. We report temperature and magnetic field dependence of the nanowire superconducting junctions, which is in agreement with the proximity-effect theory of superconductor-normal metal-superconductor weak link. Superconducting coherence length of the InAs nanowire is estimated from the fit and magnetic-field dependence of the critical current and the subgap structure of dI/dV is discussed as well.
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