26 citations · 76 across the 18 of their papers we have counts for
19 papers
Activating Basal Planes in Transition Metal Dichalcogenides for CO2 Reduction to CO through Alloying
Eric Montufar-Morales, Daniel Rinder, Pravan Omprakash +2
Transition metal dichalcogenides (TMDCs) have emerged as highly tunable platforms for electrocatalysis, particularly for the CO2 reduction reaction (CO2RR). While TMDC edge sites e…
Twist-induced Out-of-plane Ferroelectricity in Bilayer Hafnia
Jian Huang, Gwan Yeong Jung, Pravan Omprakash +6
Ferroelectric HfO2 is a promising candidate for next-generation memory devices due to its CMOS compatibility and ability to retain polarization at nanometer scales. However, the po…
Design Rules and Discovery of Face-Sharing Hexagonal Perovskites
M. J. Swamynadhan, Gwan Yeong Jung, Pravan Omprakash +1
Hexagonal perovskites with face-sharing octahedral connectivity are an underexplored class of materials. We propose quantitative design principles for stabilizing face-sharing ABX3…
Hole-doping reduces the coercive field in ferroelectric hafnia
Pravan Omprakash, Gwan Yeong Jung, Guodong Ren +1
Ferroelectric hafnia (HfO2) holds promise for next-generation memory and logic applications because of its CMOS compatibility. However, the high coercive field required for polariz…
Sub-nm2 ferroelectric domains via charged 180 degree walls in ZrO2
Nashrah Afroze, Hamoon Fahrvandi, Guodong Ren +31
Flat phonon bands in fluorite ferroelectrics (HfO2 or ZrO2) shrink polar domains laterally to an irreducible half-unit-cell width (0.27 nm) within which the vertical arrangement of…
Towards Atomic-Scale Control over Structural Modulations in Quasi-1D Chalcogenides for Colossal Optical Anisotropy
Guodong Ren, Shantanu Singh, Gwan Yeong Jung +10
Optically anisotropic materials are sought after for tailoring the polarization of light. Recently, colossal optical anisotropy was reported in a quasi-one-dimensional chalcogenide…
Strong tunability of epitaxial relationship and reconstruction at improper ferroelectric interface
Xin Li, Yu Yun, Guodong Ren +4
The atomic structures at epitaxial film-substrate interfaces determine scalability of thin films and can result in new phenomena. However, it is challenging to control the interfac…
Antiferroelectricity with metastable polar state from Kittel model
Amit Kumar Shah, Xin Li, Guodong Ren +3
We have revisited the Kittel model that describes antiferroelectricity (AFE) in terms of two sublattices of spontaneous polarization with antiparallel couplings. By constructing th…
Polarization Pinning at Antiphase Boundaries in Multiferroic YbFeO
Guodong Ren, Pravan Omprakash, Xin Li +4
The switching characteristics of ferroelectrics and multiferroics are influenced by the interaction of topological defects with domain-walls. We report on the pinning of polarizati…
Improper flexoelectricity in hexagonal rare-earth ferrites
Xin Li, Guodong Ren, Yu Yun +5
Flexoelectricity is a universal effect that generates electric polarization due to broken inversion symmetry caused by local strain gradient. The large strain gradient at nanoscale…
Strain-driven stabilization of a room-temperature chiral multiferroic with coupled ferroaxial and ferroelectric order
Guodong Ren, Gwan Yeong Jung, Huandong Chen +9
Noncollinear ferroic materials are sought after as testbeds to explore the intimate connections between topology and symmetry, which result in electronic, optical and magnetic func…
Antiferroelectric Hafnia Down to the 2D Limit
Xin Li, Guodong Ren, Haidong Lu +16
Antiferroelectricity is a material property characterized by alternating electric dipoles spontaneously ordered in antiparallel directions. Antiferroelectrics are promising for ene…
Emergent Atomic Scale Polarisation Vortices in BaTiS3
Boyang Zhao, Gwan Yeong Jung, Shantanu Singh +21
Topological defects, such as vortices and skyrmions in magnetic and dipolar systems, can give rise to properties that are not observed in typical magnets and dielectrics. Here, we…
Molten flux growth of single crystals of quasi-1D hexagonal chalcogenide BaTiS3
Huandong Chen, Shantanu Singh, Hongyan Mei +7
BaTiS3, a quasi-1D complex chalcogenide, has gathered considerable scientific and technological interest due to its giant optical anisotropy and electronic phase transitions. Howev…
Giant Modulation of Refractive Index from Picoscale Atomic Displacements
Boyang Zhao, Guodong Ren, Hongyan Mei +21
Structural disorder has been shown to enhance and modulate magnetic, electrical, dipolar, electrochemical, and mechanical properties of materials. However, the possibility of obtai…
Topological interfacial states in ferroelectric domain walls of two-dimensional bismuth
Wei Luo, Yang Zhong, Hongyu Yu +4
Using machine learning methods, we explore different types of domain walls in the recently unveiled single-element ferroelectric, the bismuth monolayer [Nature 617, 67 (2023)]. Rem…
Quasi-epitaxial growth of BaTiS films
M. Surendran, B. Zhao, G. Ren +7
Perovskite chalcogenides have emerged as a new class of semiconductors with tunable band gap in the visible-infrared region. High quality thin films are critical to understand the…
Orientation Controlled Anisotropy in Single Crystals of Quasi-1D BaTiS3
Boyang Zhao, Md Shafkat Bin Hoque, Gwan Yeong Jung +17
Low-dimensional materials with chain-like (one-dimensional) or layered (twodimensional) structures are of significant interest due to their anisotropic electrical, optical, thermal…
Defect states and disorder in charge transport in semiconductor nanowires
Dongkyun Ko, X. W. Zhao, Kongara M. Reddy +8
We present a comprehensive investigation into disorder-mediated charge transport in InP nanowires in the statistical doping regime. At zero gate voltage transport is well described…