Biaxial Compressive Strain Engineering in Graphene/Boron Nitride Heterostructures

Biaxial Compressive Strain Engineering in Graphene/Boron Nitride Heterostructures

Strain engineered graphene has been predicted to show many interesting physics and device applications. Here we study biaxial compressive strain in graphene/hexagonal boron nitride heterostructures after thermal cycling to high temperatures likely due to their thermal expansion coefficient mismatch. The appearance of sub-micron self-supporting bubbles indicates that the strain is spatially inho...

Ultrafast strain engineering in complex oxide heterostructures.

We report on ultrafast optical experiments in which femtosecond midinfrared radiation is used to excite the lattice of complex oxide heterostructures. By tuning the excitation energy to a vibrational mode of the substrate, a long-lived five-order-of-magnitude increase of the electrical conductivity of NdNiO(3) epitaxial thin films is observed as a structural distortion propagates across the int...

Gate leakage suppression and contact engineering in nitride heterostructures

We present a self-consistent approach to examine current flow in a general metal–polar heterostructure junction. The approach is applied to examine properties of three classes of junctions that are important in devices: ~i! GaN/AlGaN structures that are used in nitride heterojunction field effect transistors; ~ii! GaN/AlGaN/high-k insulator structures for potential application in very small gat...

Strain engineering via amorphization and recrystallization in Si/Ge heterostructures

Strain-engineering of band gaps in piezoelectric boron nitride nanoribbons.

Two-dimensional atomic sheets such as graphene and boron nitride monolayers represent a new class of nanostructured materials for a variety of applications. However, the intrinsic electronic structure of graphene and h-BN atomic sheets limits their direct application in electronic devices. By first-principles density functional theory calculations we demonstrate that band gap of zigzag BN nanor...