Publications (29)
Fatigue-free ferroelectricity in Hf0.5Zr0.5O2 ultrathin films via interfacial design
Chao Zhou, Yanpeng Feng, Liyang Ma +10
Due to traits of CMOS compatibility and scalability, HfO2-based ferroelectrics are promising candidates for next-generation memory devices. However, their commercialization has bee…
Optical Control of Adaptive Nanoscale Domain Networks
Marc Zajac, Tao Zhou, Tiannan Yang +13
Adaptive networks can sense and adjust to dynamic environments to optimize their performance. Understanding their nanoscale responses to external stimuli is essential for applicati…
Carrier driven coupling in ferromagnetic oxide heterostructures
Ching-Hao Chang, Sujit Das, Sanjeev Kumar +1
Transition metal oxides are well known for their complex magnetic and electrical properties. When brought together in heterostructure geometries, they show particular promise for s…
Mechanical configurable nanopatterning of polar topological states and formation of post-skyrmion
Lizhe Hu, Linming Zhou, Yuhui Huang +4
The controllable phase transition and nanopatterning of topological states in a ferroelectric system under external stimuli are critical for realizing the potential applications in…
Room-temperature ferromagnetism at an oxide/nitride interface
Qiao Jin, Zhiwen Wang, Qinghua Zhang +26
Heterointerfaces have led to the discovery of novel electronic and magnetic states because of their strongly entangled electronic degrees of freedom. Single-phase chromium compound…
Subterahertz collective dynamics of polar vortices
Qian Li, Vladimir A. Stoica, Marek PaÅciak +29
The collective dynamics of topological structures have been of great interest from both fundamental and applied perspectives. For example, the studies of dynamical properties of ma…
Enhanced polarization switching characteristics of HfO2 ultrathin films via acceptor-donor co-doping
Chao Zhou, Liyang Ma, Yanpeng Feng +13
In the realm of ferroelectric memories, HfO2-based ferroelectrics stand out because of their exceptional CMOS compatibility and scalability. Nevertheless, their switchable polariza…
Strain dependence of antiferromagnetic interface coupling in La0.7Sr0.3MnO3/SrRuO3 superlattices
Sujit Das, Andreas Herklotz, Eckhard Pippel +3
We have investigated the magnetic response of La0.7Sr0.3MnO3/SrRuO3 superlattices to biaxial in-plane strain applied in-situ. Superlattices grown on piezoelectric substrates of 0.7…
Doping effects on the magnetic frustration in the honeycomb iridates
Sujit Das, Er Jia Guo, Krishanu Roychowdhury
We investigate the doping effects of magnetic and nonmagnetic impurities injected to the honeycomb iridate sample of Na2IrO3 . Both the doping result in changing the ordering tempe…
Decoupling effects of the resistive-switching behavior on the polarization reversal in ultrathin ferroelectric Hf0.5Zr0.5O2 films
Chao Zhou, Sizhe Huang, Yangyang Si +10
HfO2-based ferroelectric films have attracted considerable attention as their nanoscale ferroelectricity and compatibility with cmos technology, fulfilling demands of emerging memo…
Electric Field Control of Chirality
Piush Behera, Molly A. May, Fernando Gómez-Ortiz +18
Polar textures have attracted significant attention in recent years as a promising analog to spin-based textures in ferromagnets. Here, using optical second harmonic generation bas…
Topological spin-texture transitions in van der Waals magnets revealed by X-ray Fourier transform holography
Sourav Chowdhury, Soumyaranjan Dash, Michael Schneider +14
Nontrivial topological spin-textures, such as skyrmions, merons, bimerons, and skyrmioniums, are envisioned as robust building blocks for future memory and logic devices. Controlla…
Nitrogen doping induced metal-insulator transition with iso-symmetric character in rutile VO2
Baichen Lin, Shanquan Chen, Yubo Zhang +18
Metal-insulator transitions (MITs) in correlated oxides offer immense potential for next-generation Mottronic devices. However, their integration into practical applications is oft…
PTST: A polar topological structure toolkit and database
Guanshihan Du, Yuanyuan Yao, Linming Zhou +11
Ferroelectric oxide superlattices with complex topological structures such as vortices, skyrmions, and flux closure domains have garnered significant attention due to their fascina…
Erbium-Implanted Materials for Quantum Communication Applications
Paul Stevenson, Christopher M Phenicie, Isaiah Gray +10
Erbium-doped materials can serve as spin-photon interfaces with optical transitions in the telecom C-band, making them an exciting class of materials for long-distance quantum comm…
Harnessing the polar vortex motion in oxide heterostructures
Pushpendra Gupta, Mohit Tanwani, Qi Xu +7
Polar topology, an analogue of the magnetic topology, serves as a large playground for exotic physical phenomena with a wide range of multifunctional applications. Polar vortices a…
Local Manipulation of Polar Skyrmions and Topological Phase Transitions
Linming Zhou, Yongjun Wu, Sujit Das +7
Topological phases such as polar skyrmions have been a fertile playground for ferroelectric oxide superlattices, with exotic physical phenomena such as negative capacitance. Herein…
Consensus and Consistency Level Optimization of Fuzzy Preference Relation: A Soft Computing Approach
Sujit Das, Samarjit Kar
In group decision making (GDM) problems fuzzy preference relations (FPR) are widely used for representing decision makers' opinions on the set of alternatives. In order to avoid mi…
Hexagonal close-packed polar-skyrmion lattice in ultrathin ferroelectric PbTiO3 films
Shuai Yuan, Zuhuang Chen, Sergei Prokhorenko +7
Polar skyrmions are topologically stable, swirling polarization textures with particle-like characteristics, which hold promise for next-generation, nanoscale logic and memory. Whi…
Unlocking Cryogenic Energy Storage by Constructing Dipole Glass with Unit-cell-level Polar Disorder
Yangyang Si, Denan Li, Yijie Li +21
Cryogenic energy storage is vital for frontier technologies including deep-space exploration and quantum computing, yet conventional electrochemical energy systems fail below ~230…
Emergent chirality in a polar meron to skyrmion phase transition
Yu-Tsun Shao, Sujit Das, Zijian Hong +10
Polar skyrmions are predicted to emerge from the interplay of elastic, electrostatic and gradient energies, in contrast to the key role of the anti-symmetric Dzyalozhinskii-Moriya…
Non-equilibrium pathways to emergent polar supertextures
Vladimir A. Stoica, Tiannan Yang, Sujit Das +31
Ultrafast stimuli can stabilize metastable states of matter inaccessible by equilibrium means. Establishing the spatiotemporal link between ultrafast excitation and metastability i…
Ideal antiferroelectricity with large digital electrostrain in PbZrO3 epitaxial thin films
Yangyang Si, Ningbo Fan, Yongqi Dong +13
Antiferroelectrics exhibit reversible antipolar-polar phase transitions under electric fields, yielding large electrostrain suitable for electromechanical devices. Nevertheless, in…
Antiferroelectric Oxide Thin-Films: Fundamentals, Properties, and Applications
Yangyang Si, Tianfu Zhang, Chenhan Liu +5
Antiferroelectrics have received blooming interests because of a wide range of potential applications in energy storage, solid-state cooling, thermal switch, transducer, actuation,…
Enhancing ferroelectric stability: Wide-range of adaptive control in epitaxial HfO2/ZrO2 superlattices
Jingxuan Li, Shiqing Deng, Liyang Ma +12
The metastability of the polar phase in HfO2, despite its excellent compatibility with the complementary metal-oxide-semiconductor process, remains a key obstacle for its industria…
Large Enhancement of Properties in Strained Lead-free Multiferroic Solid Solutions with Strong Deviation from Vegard's Law
Tao Wang, Mingjie Zou, Dehe Zhang +18
Efforts to combine the advantages of multiple systems to enhance functionlities through solid solution design present a great challenge due to the constraint imposed by the classic…
Silicon-compatible ideal antiferroelectricity with large digital electromechanical responses enabled by thermal-strain domain engineering
Hao Xiong, Huazhang Zhang, Liang Shu +16
Antiferroelectrics exhibit reversible antipolar-polar transformations, offering a compelling platform for multiple functionalities in modern nanoelectronics, yet deterministic cont…
Order-disorder transitions in a polar vortex lattice
Linming Zhou, Cheng Dai, Peter Meisenheimer +9
Order-disorder transitions are widely explored in various vortex structures in condensed matter physics, i.e., in the type-II superconductors and Bose-Einstein condensates. In this…
Terahertz-field activation of polar skyrons
Huaiyu Wang, Vladimir Stoica, Cheng Dai +27
Unraveling collective modes arising from coupled degrees of freedom is crucial for understanding complex interactions in solids and developing new functionalities. Unique collectiv…