TAILIEUCHUNG - Báo cáo " Influence of intradot Coulomb interaction on transport properties of an Aharonov-Bohm interferometer "

Using Greens function method and the equation of motion approach, we have investigated the electronic transport properties of an Aharonov-Bohm (AB) ring in the presence of a magnetic field with a quantum dot inserted in one arm of the ring. In particular, we consider the electron-electron Coulomb interaction within the quantum dot. We find that the current through the system is dependent on the magnetic flux via the AB phase and the Coulomb interaction within the quantum dot, in agreement with experiments. Furthermore, the intradot Coulomb interaction induces dephasing. . | VNU Journal of Science Mathematics - Physics 23 2007 47-54 Influence of intradot Coulomb interaction on transport properties of an Aharonov-Bohm interferometer Do Ngoc Son1 2 Bach Thanh Cong1 Department of Physics College of Science VNU 334 Nguyen Trai Hanoi Vietnam 2 Graduate School of Engineering Osaka University Japan Received 15 May 2007 Abstract. Using Greens function method and the equation of motion approach we have investigated the electronic transport properties of an Aharonov-Bohm AB ring in the presence of a magnetic field with a quantum dot inserted in one arm of the ring. In particular we consider the electron-electron Coulomb interaction within the quantum dot. We find that the current through the system is dependent on the magnetic flux via the AB phase and the Coulomb interaction within the quantum dot in agreement with experiments. Furthermore the intradot Coulomb interaction induces dephasing. 1. Introduction For the nanodevices-such as a quantum ring and a quantum dot the wave nature of the electrons contributes a crucial role. In the Aharonov-Bohm AB interferometer 1-3 the electron waves travel from the source to the drain along two different paths of the ring. The accumulated phase difference between these two waves can be changed by applying a magnetic field. Experiments show that a transport through the AB interferometer has the following striking features i the AB phase increases sharply by n ii the transmission amplitudes at the various resonances are in phase iii the transport is partially coherent in the presence of a strong intradot Coulomb interaction 1-3 . Hackenbroich et al. calculated the entire scattering amplitude through the AB interferometer and reported theoretical results on the phase coherent transport through the quantum dot in the frame of the single-particle scattering theory 3 4 . They focused on the AB phase and their results showed that as a function of the voltage on the dot only the amplitude of the current .

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