Granger G, Eisenstein J P, Reno J L
Condensed Matter Physics, California Institute of Technology, Pasadena, California 91125, USA.
Phys Rev Lett. 2009 Feb 27;102(8):086803. doi: 10.1103/PhysRevLett.102.086803. Epub 2009 Feb 23.
Heat transport in the quantum Hall regime is investigated using micron-scale heaters and thermometers positioned along the edge of a millimeter-scale two dimensional electron system (2DES). The heaters rely on localized current injection into the 2DES, while the thermometers are based on the thermoelectric effect. In the nu=1 integer quantized Hall state, a thermoelectric signal appears at an edge thermometer only when it is "downstream," in the sense of electronic edge transport, from the heater. When the distance between the heater and the thermometer is increased, the thermoelectric signal is reduced, showing that the electrons cool as they propagate along the edge.
利用沿毫米级二维电子系统（2DES）边缘放置的微米级加热器和温度计，对量子霍尔体系中的热输运进行了研究。加热器依靠向2DES中局部注入电流，而温度计则基于热电效应。在ν = 1的整数量子化霍尔态中，仅当边缘温度计在电子边缘输运意义上位于加热器“下游”时，边缘温度计才会出现热电信号。当加热器与温度计之间的距离增加时，热电信号减小，这表明电子沿边缘传播时会冷却。
