Designer 2D bandstructures by superlattice patterning of layered materials
Abstract
Title: Visualization Search and Recommendation to Accelerate the Discovery of Trends, Patterns, and InsightsObjective:PI proposes" a systematic study of 2D bandstructure engineering achieved by nano-scale electrostatic patterning of 2D layered materials. Approach:PI will exploit a recently developed fabrication techniques that allows him to spatially modify the local Fermi energy in van d"er Waals heterostructures, by field effect gating with patterned dielectrics.SOW:Work is subdivided into three thrusts:Thrust I": Arti cial graphene superlattices (years 1-3)Scale superlattice length scale to sub 20 nm Quantify disorder e ects in square and triangular lattices Fabricate and characterize honeycomb and kagome superlatticeDemonstrate superlattice patterning in bilayer grapheneMagnetotransport of anti-dot arrays in bilayer grapheneFabricate and characterize mixed domain superlattices`Demonstrate pseudo-strained and 5-fold symmetric superlatticesThurst II: 1D graphene superlattices (years 1-2)Achieve 1D superlattice pattern with sub 50 nm spacingCon rm prediction of electron supercollimation Con rm tunable Landau level degeneracy in QHE regimeThrust III: Arti cial TMD superlattices (years 2-3)Successfully modulate semiconductor TMD with superlattice potential Study e ect of spin-orbit coupling on Honeycomb superlatticeNavy relevance:In addition to the providing a new material platform in which to study fundam"entalphysical properties of low dimensional systems, this effort is anticipated to enabletransformative new technological applicat""ions relevant to the DOD including novelelectron switches based on electron beam-collumnation, tunable optical electronics, andtop"ological device characteristics. The capability to locally manipulate the bandstructureby patterning could enable the opportunity t"o build coupled, multi-component circuits ina single material. Superlattice patterning by field effect gating further provides the" uniquepossibility of dynamic band-structure modulation in real-time.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 01, 2017
- Source ID
- N000141712832
Entities
People
- Cory Dean
Organizations
- Office of Naval Research
- Trustees of Columbia University in the City of New York
- United States Navy