Departmental Papers (ESE)


The speed of integrated circuits is ultimately limited by the mobility of electrons or holes, which depend on the effective mass in a semiconductor. Here, building on an analogy with electromagnetic metamaterials and transformation optics, we describe a transport regime in a semiconductor superlattice characterized by extreme anisotropy of the effective mass and a low intrinsic resistance to movement—with zero effective mass—along some preferred direction of electron motion. We theoretically demonstrate that such a regime may permit an ultrafast, extremely strong electron response, and significantly high conductivity, which, notably, may be weakly dependent on the temperature at low temperatures. These ideas may pave the way for faster electronic devices and detectors and functional materials with a strong electrical response in the infrared regime.

Document Type

Journal Article

Date of this Version



Silveirinha, M. & Engheta, M. (2012). Transformation electronics: Tailoring the effective mass of electrons. Physical Review B, 86(16), 161104. doi: 10.1103/PhysRevB.86.161104

©2012 American Physical Society



Date Posted: 28 February 2013

This document has been peer reviewed.