“…The hopping processes can be thermally activated or may occur via tunneling. Aside of classical examples as amorphous or heavily doped semiconductors, hopping conductivity was also found in a large variety of electronically correlated materials (e.g., [56,57,58,59,60,61,62]), also including several organic charge-transfer salts (e.g., [7,63,64,65]). There are various theoretical treatments of hopping charge transport (see, e.g., [66,67,68,69]), the most prominent one being Mott's variable-range hopping (VRH) model, assuming phonon-assisted tunneling processes [70].…”