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We delve into the conditions under which a quantum dot thermoelectric setupmay be tuned to realize an optimal heat-to-pure-spin-current converter. It iswell known that a heat-to-pure-spin-current converter may be realized using anon-interacting quantum dot with a spin-split energy spectrum under particlehole symmetry conditions. However, with the inclusion of Coulomb interaction$U$, ubiquitous in typical quantum dot systems, the relevant transport physicsis expected to be altered. In this work, we provide a detailed picture ofthermoelectric pure spin currents at various Coulomb interaction parameters $U$and describe the conditions necessary for an exact cancellation of chargetransport between energy levels $\epsilon$ and their Coulomb-charged partnerlevels $\epsilon+U$, so as to yield the largest terminal pure spin currents. Anon-trivial aspect pointed out here is that at sufficiently large values of $U$($\ge U_0$), pure spin currents tend to optimize at points other than where theparticle-hole symmetry occurs. It is also ascertained that a global maximum ofpure spin current is generated at a typical value of the interaction parameter$U$. These optimum conditions may be easily realized using a typical gatedquantum dot thermoelectric transport setup

Optimal Single Quantum Dot Heat-to-pure-spin-current Converters