94 citations · 268 across the 11 of their papers we have counts for
11 papers
Engineering strong magnetoelectricity using a hexagonal 2D material on electron-doped hexagonal LuFeO
M. J. Swamynadhan, Andrew O'Hara, Saurabh Ghosh +1
Cubic perovskite-structure ABO and AABO-type oxides have been investigated extensively while their hexagonal-structure versions have received minimal…
High-temperature phonons in h-BN: momentum-resolved vibrational spectroscopy and theory
Andrew O'Hara, Benjamin Plotkin-Swing, Niklas Dellby +4
Vibrations in materials and nanostructures at sufficiently high temperatures result in anharmonic atomic displacements, which leads to new phenomena such as thermal expansion and m…
Direct Visualization of Localized Vibrations at Complex Grain Boundaries
Eric R. Hoglund, De-Liang Bao, Andrew O'Hara +7
Grain boundaries (GBs) are a prolific microstructural feature that dominates the functionality of a wide class of materials. The change in functionality at a GB is a direct result…
Strong and tunable magnetoelectric coupling in 2D trilayer heterostructures
Xin Jin, Andrew O'Hara, Yu-Yang Zhang +2
The quest for electric-field control of nanoscale magnetic states such as skyrmions, which would impact the field of spintronics, has led to a challenging search for multiferroic m…
The origin of insulating and non-ferromagnetic SrRuO3 monolayers
Zeeshan Ali, Zhen Wang, Andrew O'Hara +5
The electro-magnetic properties of ultrathin epitaxial ruthenate films have long been the subject of debate. Here we combine experimental with theoretical investigations of (SrTiO3…
Ionic control over ferroelectricity in 2D layered van der Waals capacitors
Sabine M. Neumayer, Mengwei Si, Junkang Li +7
The van der Waals layered material CuInP2S6 features interesting functional behavior, including the existence of four uniaxial polarization states, polarization reversal against th…
Unique features of polarization in ferroelectric ionic conductors
Andrew O'Hara, Nina Balke, Sokrates T. Pantelides
Ferroelectrics that are also ionic conductors offer possibilities for novel applications with high tunability, especially if the same atomic species causes both phenomena. In parti…
Nanoscale Phonon Spectroscopy Reveals Emergent Interface Vibrational Structure of Superlattices
Eric R. Hoglund, De-Liang Bao, Andrew O'Hara +16
As the length-scales of materials decrease, heterogeneities associated with interfaces approach the importance of the surrounding materials. Emergent electronic and magnetic interf…
Quantum Prediction of Ultra-Low Thermal Conductivity in Lithium Intercalation Materials
Tianli Feng, Andrew O'Hara, Sokrates T. Pantelides
Lithium-intercalated layered transition-metal oxides, LixTMO2, brought about a paradigm change in rechargeable batteries in recent decades and show promise for use in memristors, a…
Formation energies of charged defects in two-dimensional materials -- resolution of long-standing difficulties
Andrew O'Hara, Blair R. Tuttle, Xiao-Guang Zhang +1
Formation energies of charged point defects in semiconductors are calculated using periodic supercells, which entail a divergence arising from long-range Coulombic interactions. Th…
Atomic-Resolution Visualization and Doping Effects of Complex Structures in Intercalated Bilayer Graphene
Jason P. Bonacum, Andrew O'Hara, De-Liang Bao +9
Molecules intercalating two-dimensional (2D) materials form complex structures that have been mostly characterized by spatially averaged techniques. Here we use aberration-correcte…