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، بهار 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 | ||
| مراجع | ||
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آمار تعداد مشاهده مقاله: 618 تعداد دریافت فایل اصل مقاله: 575 |
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