  Refrigerators soak up heat energy from a low-temperature region and dump it
into a higher temperature region using external work done on the system.
Refrigerators are useful in cooling down a system to very low temperatures. In
this letter, we show that a monolayer of strained graphene can be used in
designing a quantum refrigerator with an excellent coefficient of performance
and large cooling power. The operating point at which the strained graphene
device works best as a quantum refrigerator is derived and the effects of
strain and temperature on cooling are discussed.
