  We study the modifications of near-field radiative energy transfer (NFRET)
caused by residual surface charges, which are common in micro- and nano-systems
like NEMS/MEMS. The host object with the residual surface charges and the
inherent bulk state can be treated as an analog of the real three-dimensional
topological insulator, which is inherent of also both surface states and bulk
states and is promising to modulate NFRET. Through constructing such a
topological insulator analog, we aim to modulate NFRET concerning only common
trivial materials. Besides the well-known resonant modes (surface polariton and
localized surface polariton) supported by the bulk state, the residual surface
charges give rise to an additional temperature-dependent mode providing a new
heat flux channel. For low temperatures we find a giant surface-charge-induced
enhancement of the NFRET due to a good match between the surface-charge-induced
resonance and the Planck window. However, for relative high temperatures where
the Fr\"{o}hlich resonance dominates the heat transfer rather the
surface-charge-induced resonance, the residual charges result in a weakening of
the NFRET. This work paves way for understanding and modulating the near-field
radiative energy transfer for micro- and nano-systems.
