Figure , Mutual interactions between two electrons Fig. exhibits the interactions of two electrons. Three temperatures are applied because the attractive force depends on the temperature. As shown in Fig. , at 4 K, the attractive force is more potent than the repulsive force at a distance longer than about 1 μm. At 298 K, the distance is about 10 nm, while at 2.7×10 4 K, about 1 Å, respectively. That is to say, as temperature rises, the distance decreases. However, it should be stressed that this temperature refers to the electron temperature rather than the common molecule.