Hoạt động
|
Seminar
| Seminar Vật lý lý thuyết và Vật lý tính toán:
| | Tên báo cáo | Thermoelectrics of a Quantum Impurity
|
|---|
| Người trình bày | GS. Mikhail Kiselev
|
|---|
| Cơ quan | The Abdus Salam International Centre for Theoretical Physics
|
|---|
| Ngày | Thứ Năm, 14-11-2019
|
|---|
| Giờ | 10:00 AM
|
|---|
| Địa điểm | Phòng 62, Tầng 6, Nhà 2H, 18 Hoàng Quốc Việt, Cầu Giấy, Hà Nội
|
|---|
| Tóm tắt | We investigate thermoelectric transport through a SU(N) quantum impurity in the Kondo regime. The strong-coupling fixed-point theory is described by the local Fermi-liquid paradigm. Using Keldysh technique we analyze the electric current through the quantum impurity at both finite bias voltage and finite temperature drop across it. The theory of a steady state at zero current provides a complete description of the Seebeck effect. We find pronounced nonlinear effects in temperature drop at low temperatures. We illustrate the significance of the non-linearities for enhancement of thermopower by two examples of SU(4) symmetric regimes characterized by a filling factor m:
(i) particle-hole symmetric at m=2 and
(ii) particle-hole non-symmetric at m=1. We analyze the effects of potential scattering and coupling asymmetry on the transport coefficients. We discuss connections between the theory and transport experiments with coupled quantum dots and carbon nanotubes.
|
|---|
| Người chủ trì | Nguyễn Thị Kim Thanh
|
|---|
|
