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Tabatabaei, S. M.. (1396). Bistability in the Electric Current through a Quantum-Dot Capacitively Coupled to a Charge-Qubit. , 29(1), 79-85. doi: 10.22059/jsciences.2018.64796
S. M. Tabatabaei. "Bistability in the Electric Current through a Quantum-Dot Capacitively Coupled to a Charge-Qubit". , 29, 1, 1396, 79-85. doi: 10.22059/jsciences.2018.64796
Tabatabaei, S. M.. (1396). 'Bistability in the Electric Current through a Quantum-Dot Capacitively Coupled to a Charge-Qubit', , 29(1), pp. 79-85. doi: 10.22059/jsciences.2018.64796
Tabatabaei, S. M.. Bistability in the Electric Current through a Quantum-Dot Capacitively Coupled to a Charge-Qubit. , 1396; 29(1): 79-85. doi: 10.22059/jsciences.2018.64796

Bistability in the Electric Current through a Quantum-Dot Capacitively Coupled to a Charge-Qubit

Journal of Sciences, Islamic Republic of Iran
مقاله 7، دوره 29، شماره 1، فروردین 2018، صفحه 79-85    اصل مقاله (209.73 K)
نوع مقاله: Final File
شناسه دیجیتال (DOI): 10.22059/jsciences.2018.64796
نویسنده
S. M. Tabatabaei*
Department of Applied Physics, Faculty of Physics, University of Shahid Beheshti, Evin, Tehran, Islamic Republic of Iran
چکیده
We investigate the electronic transport through a single-level quantum-dot which is capacitively coupled to a charge-qubit. By employing the method of nonequilibrium Green's functions, we calculate the electric current through quantum dot at finite bias voltages. The Green's functions and self-energies of the system are calculated perturbatively and self-consistently to the second order of interaction between the quantum-dot and the charge-qubit by employing the Majorana fermion representation for isospin operators of the qubit. Our results show that in the particle-hole symmetric situation, the electric current of the QD exhibits a unitary linear conductance at low bias voltage and at the higher bias voltage it has a nonlinear dependence on the bias voltage. Moreover, we find that at some appropriate parameter regimes, the current through the QD as a function of gate voltage, at a fixed bias voltage shows bistability.
کلیدواژه‌ها
Nonequilibrium green's function method؛ Current bistability؛ Perturbation theory؛ Majorana fermion representation of spin operators
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