Negative differential resistance (NDR) is a phenomenon in which an increase in voltage across a device results in a decrease in current flowing through it. This counterintuitive behavior arises from quantum mechanical effects such as tunneling and energy band transitions, making it significant in devices where controlling current flow is essential. The occurrence of NDR plays a vital role in the operation of various nanoelectronic devices, particularly in tunneling scenarios and charge transport through molecular junctions.
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