Chiral heat transport in driven quantum Hall and quantum spin Hall edge states

• Autores: Arrachea, Liliana del Carmen; Fradkin, Eduardo
• Año de publicación: 2011
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Quantum; Hall; Thermal; Transport
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

We consider a model for an edge state of electronic systems in the quantum Hall regime with filling ν=1 and in the quantum spin Hall regime. In both cases, the system is in contact with two reservoirs by tunneling at point contacts. Both systems are locally driven by applying an ac voltage in one of the contacts. By weakly coupling them to a third reservoir, the transport of the generated heat is studied in two different ways: (i) when the third reservoir acts as a thermometer, the local temperature is sensed and (ii) when the third reservoir acts as a voltage probe, the time-dependent local voltage is sensed. Our results indicate a chiral propagation of the heat along the edge in the quantum Hall and in the quantum spin Hall cases (if the injected electrons are spin polarized). We also show that a analogous picture is obtained if instead of heating by ac driving the system is put in contact to a stationary reservoir at a higher temperature. In both cases, the temperature profile shows that the electrons along the edge thermalize with the closest "upstream" reservoir. © 2011 American Physical Society.
Fil: Arrachea, Liliana del Carmen. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; Argentina
Fil: Fradkin, Eduardo. University of Illinois. Urbana - Champaign; Estados Unidos