skip to main content

SciTech ConnectSciTech Connect

Title: Thin-film topological insulator-ferromagnet heterostructures for terahertz detection

An atomically thin topological insulator is investigated theoretically for long-wavelength photodetection when it interacts with a magnetic material. Through the coupling between top and bottom surfaces as well as the exchange interaction with the proximate ferromagnet, the distribution of optically excited carriers exhibits unique patterns that depend sensitively on the frequency of the incoming light. This effect results in the generation of strong nonzero photocurrent, leading potentially to room-temperature detection of far-infrared/THz radiation with the advantage of low noise and fast response. The ease of frequency tuning by an external electrical bias offers an added versatility in the realistic implementation.
Authors:
; ;  [1]
  1. Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, North Carolina 27695-7911 (United States)
Publication Date:
OSTI Identifier:
22283150
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 6; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; CHARGE CARRIERS; COUPLING; DIELECTRIC MATERIALS; EXCHANGE INTERACTIONS; FERROMAGNETIC MATERIALS; FERROMAGNETISM; SURFACES; TEMPERATURE RANGE 0273-0400 K; THIN FILMS; TOPOLOGY; VISIBLE RADIATION