Three terminal vibron coupled hybrid quantum dot thermoelectric refrigeration.

A three terminal nanoscale refrigeration concept [1] based on a
vibron-coupled quantum dot hybrid system coupled to two electronic reservoirs
and a phonon bath is proposed and analyzed in detail. While investigating the
non-trivial role of electron-phonon interactions, we show that, although they are
well known to be detrimental from a general refrigeration perspective, they can be
engineered to favorably improve the trade-off between the cooling power (CP)
and the coefficient-of-performance (COP). To justify its
impact in optimizing the peak CP and COP, we show that a weak coupling with
the bath is preferable when the phonons relax through it and a strong coupling
is suitable in the opposite case when the phonons are extracted from the bath.
We believe that many aspects presented here could
offer important guidelines for a possible realization of molecular and quantum
dot thermoelectric refrigerator.
References:
[1] S. Mukherjee, B. De and B. Muralidharan, arXiv:2004.12763 (2020).