Abstract
We demonstrate effective electron cooling of the normal metal strip bysuperconductor–insulator–normal metal (SIN) tunnel junctions. The improvement wasachieved by two methods: first, by using an advanced geometry of the superconductingelectrodes for more effective removal of the quasiparticles; and second, by adding a normalmetal trap just near the cooling junctions. With simple cross geometry and without normalmetal traps, the decrease in electron temperature is 56 mK. With the advanced geometry ofthe superconducting electrodes, the decrease in electron temperature is 129 mK. With theaddition of the normal metal traps, the decrease in electron temperature is 197 mK.
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