  Landauer's principle states that erasure of each bit of information in a
system requires at least a unit of energy $k_B T \ln 2$ to be dissipated. In
return, the blank bit may possibly be utilized to extract usable work of the
amount $k_B T \ln 2$, in keeping with the second law of thermodynamics. While
in principle any collection of spins can be utilized as information storage,
work extraction by utilizing this resource in principle requires specialized
engines that are capable of using this resource. In this work, we focus on heat
and charge transport in a quantum spin Hall device in the presence of a spin
bath. We show how a properly initialized nuclear spin subsystem can be used as
a memory resource for a Maxwell's Demon to harvest available heat energy from
the reservoirs to induce charge current that can power an external electrical
load. We also show how to initialize the nuclear spin subsystem using applied
bias currents which necessarily dissipate energy, hence demonstrating
Landauer's principle. This provides an alternative method of "energy storage"
in an all-electrical device. We finally propose a realistic setup to
experimentally observe a Landauer erasure/work extraction cycle.
