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Detection of Majorana fermions in an aharonov-bohm interferometer

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Chinese Physics B 2014年第5期23卷 478-484页

作者：尚恩明潘义明邵陆兵王伯根 National Laboratory of Solid State Microstructures and School of Physics Nanjing University

By using the non-equilibrium Green＇s function technique, we investigate the electronic transport properties in an aharonov-bohm interferometer coupling with Majorana fermions. We find a fixed unit conductance peak which is in-dependent of the other factors when the topological superconductor is grounded. Especially, an additional phase appears when the topological superconductor is in the strong Coulomb regime, which induces a new conductance resonant peak compared with the structure of replacing the topological superconductor by a quantum dot, and the conductance oscillation with the magnetic flux reveals a 2π phase shift by raising （lowering） a charge on the capacitor.

关键词： Majorana fermion quantum dot aharonov-bohm interferometer Coulomb blockade

Electron Transport Through Double-Dot aharonov-bohm interferometer in theKondo Regime

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Communications in Theoretical Physics 2004年第1期41卷 123-126页

作者： DINGGuo-Hui YUANQing-Xin XUBo-Wei DepartmentofPhysics ShanghaiJiaoTongUniversityShanghai200030China

By applying the slave boson technique, we have studied the electron transport through double-dotaharonov-bohm interferometer in the Kondo regime. For the system with symmetric quantum dots, the linear con-ductance is shown to be enhanced by Kondo effect, but it is suppressed in the deep dot level regime in the presence ofnonzero magnetic flux. The aharonov bohm oscillations of the conductance are also investigated.

关键词： quantum dot aharonov-bohm interferometer Kondo effect

Transmission of electron through an aharonov-bohm interferometer with a quantum dot in Coulomb blockade regime

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Chinese Physics B 2004年第1期13卷 95-99页

作者：孙科伟熊诗杰 StateKeyLaboratoryofSolidStateMicrostructureandDepartmentofPhysics NanjingUniversityNanjing210093China

We calculate conductance of an aharonov-bohm (AB) interferometer for which a single-level quantum dot in the Coulomb blockade regime is embedded in one of its arms. Using the Schrodinger equations and taking into account the Coulomb interaction on the dot, we calculate conductance G as a function of flux φ threaded through the ring and as a function of gate voltage V applied to the dot. It is found that the AB oscillations of G(φ) depend on the particle occupation on the dot, controlled by V. If the system is closed, there is no loss of particles, G(φ) is periodic and G(φ) = G(-φ), satisfying the Onsager relation. In this case G(φ) can reach its maximum value, 2e2/h, at the resonance. When the system is open, one has G(φ) ≠ G(-φ), G(φ) yields a phase shift which depends on the loss rate of electrons in this open system.

关键词： aharonov-bohm interferometer quantum dot Coulomb blockade

The transport properties in an aharonov-bohm interferometer with a quantum dot

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Chinese Physics B 2007年第7期16卷 2101-2105页

作者：陈明伦王顺金 Department of Physics Sichuan University Chengdu 610064 China Center of Theoretical Nuclear Physics of Heavy Ion Research Facilities of Lanzhou of China Lanzhou 730000 China

This paper investigates the electronic transport properties in an aharonov bohm interferometer with a quantum dot coupling to left and right electrodes. By employing cluster expansions, it transforms the equations of motion of Green＇s functions into the corresponding equation of motion of connected Green＇s functions, which provides a natural and uniform truncation scheme. With this method under the Lacroix＇s truncation approximation, it shows that the asymmetric line shape of zero bias conductance manifests itself as the Fano effect, and the Kondo effect has been observed in the narrow peak of differential conductance curve of the system. Our numerical results also show that the building of Fano state suppresses the amplitude of Kondo resonance.

关键词： aharonov-bohm interferometer quantum dot Fano effect Kondo effect

Quantum transport through two series aharonov-bohm interferometers with zero total magnetic flux

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Chinese Physics B 2007年第7期16卷 2069-2074页

作者：王建明王瑞张永平梁九卿 Department of Physics and Institute of Theoretical Physics Shanxi University Taiyuan 030006 China

With the help of nonequilibrium Green＇s function technique, the electronic transport through series aharonov-bohm （AB） interferometers is investigated. We obtain the AB interference pattern of the transition probability characterized by the Mgebraic sum φ and the difference θ of two magnetic fluxes, and particularly a general rule of AB oscillation period depending on the ratio of integer quantum numbers of the fluxes. A parity effect is observed, showing the asymmetric AB oscillations with respect to the even and odd quantum numbers of the total flux in antiparallel AB interferometers. It is also shown that the AB flux can shift the Fano resonance peaks of the transmission spectrum.

关键词： aharonov-bohm interferometer difference of magnetic fluxes Fano effect

Spin-dependent quantum transport through an aharonov-bohm structure spin splitter

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Chinese Physics B 2008年第8期17卷 3058-3061页

作者：李玉现 College of Physics Hebei Normal University

Using the tight-binding model approximation, this paper investigates theoretically spin-dependent quantum transport through an aharonov-bohm （AB） interferometer. An external magnetic field is applied to produce the spinpolarization and spin current. The AB interferometer, acting as a spin splitter, separates the opposite spin polarization current. By adjusting the energy and the direction of the magnetic field, large spin-polarized current can be obtained.

关键词： aharonov-bohm interferometer magnetic field spin splitter