Modulation-doping a correlated electron insulator.

ABSTRACT: Correlated electron materials (CEMs) host a rich variety of condensed matter phases. Vanadium dioxide (VO₂) is a prototypical CEM with a temperature-dependent metal-to-insulator (MIT) transition with a concomitant crystal symmetry change. External control of MIT in VO₂-especially without inducing structural changes-has been a long-standing challenge. In this work, we design and synthesize modulation-doped VO₂-based thin film heterostructures that closely emulate a textbook example of filling control in a correlated electron insulator. Using a combination of charge transport, hard X-ray photoelectron spectroscopy, and structural characterization, we show that the insulating state can be doped to achieve carrier densities greater than 5 × 10²¹ cm

SUBMITTER: Mondal D 

PROVIDER: S-EPMC10556139 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature