Asymmetric Heat Conduction in One-Dimensional Hard-Point Model with Mass Gradient

热传导在一一个维(1D ) 有集体坡度的难点的模型被学习。用数字模拟，我们在集体增加的方向与更大的热电流在这个模型发现不对称的热导体。温度坡度，集体坡度和系统尺寸的增加被发现提高不对称的热传导。基于一个难点的粒子动态的碰撞，我们为不对称的效果的内在的机制给质的解释。

The heat conduction in a one-dimensional （1D） hard-point model with mass gradient is studied. Using numerical simulation, we find an asymmetric heat conduction in this model with greater heat current in the direction of mass increase. The increase of temperature gradient, mass gradient and system size axe found to enhance the asymmetric heat conduction. Based on the collision dynamic of a haxd-point particle, we give a qualitative explanation for the underlying mechanism of asymmetric effect.