Hoạt động khoa học
Seminar
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Seminar Trung tâm Vật lý lý thuyết: | |
| Tên báo cáo | The Interacting Mesoscopic Capacitor: from the quantum RC-circuit to out-of-equilibrium charge emission |
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| Người trình bày | Dr. Michele Filippone |
| Cơ quan | Université de Genève |
| Ngày | Thứ Sáu, 11-08-2017 |
| Giờ | 10:30 AM |
| Địa điểm | Phòng 202 (Thư viện), Viện Vật lý, 10 Đào Tấn, Ba Đình, Hà Nội |
| Tóm tắt | The mesoscopic capacitor was realized for the first time at the Laboratoire Pierre Aigrain (LPA) of Paris in 2006. Since then, it revealed a formidable platform to achieve the triggered emission of single electrons and realize highly controlled quantum optics experiments with electrons in solid state devices. I will discuss the main challenges concerning the theoretical description of this system and go beyond the quantum RC-circuit analogy by describing the full non-equilibrium response of a mesoscopic capacitor in the large transparency limit, exactly solving a model with electron-electron interactions appropriate for a cavity in the quantum Hall regime. For a cavity coupled to the electron reservoir via an ideal point contact, we show that the response to any time-dependent gate voltage V_g(t) is strictly linear in V_g. We analyze the charge and current response to a sudden gate voltage shift, and find that this response is not captured by a simple circuit analogy. In particular, in the limit of strong interactions a sudden change in the gate voltage leads to the emission of a sequence of multiple charge pulses, the width and separation of which are controlled by the charge-relaxation time τ_c=hC_g/e^2 and the time of flight τ_f. We also consider the effect of a finite reflection amplitude in the point contact, which leads to non-linear-in-gate-voltage corrections to the charge and current response. |
| Người chủ trì | Nguyễn Thị Kim Thanh |