Article
Chemistry, Multidisciplinary
Jesi R. Maguire, Conor J. Mccluskey, Kristina M. Holsgrove, Ahmet Suna, Amit Kumar, Raymond G. P. Mcquaid, J. Marty Gregg
Summary: We have used high-voltage Kelvin probe force microscopy to map the electrical potential distribution along curved current-carrying conducting domain walls in ferroelectric lithium niobate thin films. We found that the potential profiles and electric fields can be explained by variations in wall resistivity alone, without invoking additional physical phenomena. This is important for domain-wall nanoelectronics.
Article
Materials Science, Multidisciplinary
Ioannis Leontis, Gabriela Augusta Prando, Konstantinos Andreas Anastasiou, Agnes Bacon, Monica Felicia Craciun, Saverio Russo
Summary: Ballistic graphene p-n junctions (GPNJs) are fabricated using physisorbed Zn adatoms, allowing for low-cost and scalable production of electrical counterparts to optical circuits. Spatially resolved Raman spectroscopy through a quartz transparent substrate accurately maps charge doping and strain in the graphene/Zn interface and beneath the metal layer. Electrical measurements and modeling confirm the ballistic nature of charge transport up to room temperature.
Article
Physics, Applied
V. Ryzhii, M. Ryzhii, V. Mitin, M. S. Shur, T. Otsuji
Summary: In graphene field-effect transistors, the injection of ballistic electrons into the two-dimensional electron plasma may cause substantial Coulomb drag of quasiequilibrium electrons, leading to negative differential conductivity and current filamentation. The strong nonlinearity of the I-V characteristics in GFETs enables effective frequency multiplication and detection of terahertz radiation.
PHYSICAL REVIEW APPLIED
(2021)
Article
Chemistry, Multidisciplinary
Ankit Negi, Hwang Pill Kim, Zilong Hua, Anastasia Timofeeva, Xuanyi Zhang, Yong Zhu, Kara Peters, Divine Kumah, Xiaoning Jiang, Jun Liu
Summary: This paper demonstrates the room-temperature thermal modulation in 2.5 mm-thick Pb(Mg1/3Nb2/3)O-3-xPbTiO(3) (PMN-xPT) single crystals. Through the use of advanced poling conditions and a systematic study on composition and orientation dependence, a range of thermal conductivity switching ratios, with a maximum of approximately 1.27, is observed. The simultaneous measurements of piezoelectric coefficient (d(33)), domain wall density using polarized light microscopy (PLM), and birefringence change using quantitative PLM reveal an increase in domain wall density at intermediate poling states (0< d(33)< d(33(max)) compared to the unpoled state.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Jun Jiang, Xiaojie Chai, Chao Wang, Anquan Jiang
Summary: In this study, the decay of domain wall currents with time in LiNbO3 single crystals at high temperatures was observed, showing that external charge injection suppresses intrinsic diode-like DW current. The injected charge can be removed or frozen upon cooling, and the frozen wall regions become conducting after erasure.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Elena Titova, Dmitry Mylnikov, Mikhail Kashchenko, Ilya Safonov, Sergey Zhukov, Kirill Dzhikirba, Kostya S. Novoselov, Denis A. Bandurin, Georgy Alymov, Dmitry Svintsov
Summary: Graphene's high carrier mobility, compatibility with on-chip waveguides and transistors, and small heat capacitance make it a promising material for the detection of terahertz (THz) radiation. However, the weak reaction of graphene's physical properties to the detected radiation is due to the absence of a band gap. This study investigates the effect of electrically induced band gap on THz detection in graphene bilayer with split-gate p-n junction, and demonstrates that the induction of a band gap leads to increased current and voltage responsivities.
Article
Engineering, Electrical & Electronic
Pankaj Sharma, Anna N. Morozovska, Eugene A. Eliseev, Qi Zhang, Daniel Sando, Nagarajan Valanoor, Jan Seidel
Summary: The small size of ferroelectric domain walls presents challenges in determining their electrical properties accurately. This study proposes a scanning-probe-based method to directly determine the specific conductivity of a single ferroelectric domain wall in an insulating material. By using transmission line spectroscopy measurements and mean-field theory, quantitative insights into the conductivity of ferroelectric domain walls are obtained.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jian Song, Mingyu Gong, Meng-fu Tsai, Youcao Ma, Houyu Ma, Yue Liu, Ying-hao Chu, Rong Huang, Jun Ouyang, Jian Wang, Tongxiang Fan
Summary: By using atomistic simulation and microscopy characterization, a pseudo-ferroelectric domain with similar morphology to a ferroelectric domain but with the same defect character as a ferroelastic domain-wall, i.e., a semi-coherent (100)(matrix)||(100)(domain) interface, is identified. Pseudo-ferroelectric domain walls play a critical role in the migration kinetics of ferroelastic domains and the piezoelectric responses of ferroelectric thin films during cyclic mechanical/electrical loading.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Biochemistry & Molecular Biology
Yan Fan, Tao Wang, Yinwei Qiu, Yinli Yang, Qiubo Pan, Jun Zheng, Songwei Zeng, Wei Liu, Gang Lou, Liang Chen
Summary: Graphene p-n junctions have important applications in optical interconnection and low-power integrated circuits. Our study introduces a new type of pure graphene oxide (pGO) vertical p-n junction, demonstrating significant rectification effects and photoelectric responses. Additionally, our work offers a simple and convenient method for preparing undoped GO vertical p-n junctions, showing great potential for applications in electronics and sensors.
Article
Chemistry, Physical
Yanrong Wang, Feng Wang, Zhenxing Wang, Junjun Wang, Jia Yang, Yuyu Yao, Ningning Li, Marshet Getaye Sendeku, Xueying Zhan, Congxin Shan, Jun He
Summary: The study introduces a driving-voltage-free optoelectronic synaptic device based on MoTe2/alpha-In2Se3 ferroelectric p-n junctions, achieving non-volatile reconfigurable photovoltaic effect and improved photoelectrical conversion efficiency. It also successfully mimics retina synapse-like vision functions, demonstrating optoelectronic short-term and long-term plasticity, as well as basic neuromorphic learning and memory rule without applying driving voltage. This work highlights the potential of ferroelectric p-n junctions for enhanced solar cells and low-power optoelectronic synaptic devices for neuromorphic machine vision.
Article
Chemistry, Multidisciplinary
Jesse Balgley, Jackson Butler, Sananda Biswas, Zhehao Ge, Samuel Lagasse, Takashi Taniguchi, Kenji Watanabe, Matthew Cothrine, David G. Mandrus, Jairo Velasco, Roser Valenti, Erik A. Henriksen
Summary: In this study, we demonstrate ultrasharp lateral p-n junctions in graphene using electronic transport, scanning tunneling microscopy, and first-principles calculations. These junctions are formed at the boundary between differently doped regions of a graphene sheet, with one side being intrinsic and the other side being charge-doped by proximity to an alpha-RuCl3 flake. Our results show potential variations on a sub 10 nm length scale in heterostructures of graphene, hexagonal boron nitride, and alpha-RuCl3. First-principles calculations reveal a sharp decay of charge-doping from the edge of the alpha-RuCl3 flake within just a few nanometers.
Article
Engineering, Chemical
Mohammad Razaul Karim, Md. Nizam Uddin, Md. Aslam Shaikh, Md. Shamim Rahaman, Iqbal Ahmed Siddiquey, Md. Azharul Arafath, Md. Saidul Islam, Shinya Hayami, Khalid A. Alamry, Abdullah M. Asiri, Mohammed M. Rahman
Summary: This study observed modulated electron conductivity, p-n junction behavior, and light-harvesting semiconductivity in reduced graphene oxide. Different samples showed tunable electron conduction behavior, with rGOHS and rGOHV exhibiting photocatalytic activity and high water-splitting efficiency and dye degradation efficiency.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Review
Chemistry, Multidisciplinary
Pankaj Sharma, Theodore S. Moise, Luigi Colombo, Jan Seidel
Summary: The article discusses the formation of ferroelectric domain walls at nanoscale interfaces and their distinct electronic properties. It explores the potential applications of these nanoscale features in agile, low-energy electronic devices.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Physics, Multidisciplinary
Peipei Zhang, Chao Wang, Yu-Xian Li, Lixue Zhai, Juntao Song
Summary: The transport properties of electrons in graphene p-n junction with uniform Kekule lattice distortion were studied using the tight-binding model and the Landauer-Buttiker formalism combined with the nonequilibrium Green's function method. Different shapes of Kekule graphene p-n junctions result in different electron transport behaviors, with Klein tunneling and resonance tunneling playing important roles. Moreover, under strong magnetic fields, resonance tunneling was observed, and disorder can enhance conductance.
NEW JOURNAL OF PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Wenda Yang, Guo Tian, Hua Fan, Yue Zhao, Hongying Chen, Luyong Zhang, Yadong Wang, Zhen Fan, Zhipeng Hou, Deyang Chen, Jinwei Gao, Min Zeng, Xubing Lu, Minghui Qin, Xingsen Gao, Jun-Ming Liu
Summary: The study demonstrates a highly stable and fatigue-resistant nonvolatile memory device based on the creation and erasure of geometrically confined conductive domain walls. The device shows excellent restoration repeatability and long retention, potentially serving as a high-performance ferroelectric-domain-wall memory.
ADVANCED MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Kyle P. Kelley, Sergei Kalinin, Eugene Eliseev, Shivaranjan Raghuraman, Stephen Jesse, Peter Maksymovych, Anna N. Morozovska
Summary: Ferroelectric domain walls are fascinating objects in condensed matter physics with a wide range of functional behaviors. However, most studies have focused on bias-induced dynamics and transport behaviors. This article introduces a scanning probe microscopy approach that combines piezoresponse force microscopy (PFM) with a dynamically heated probe, allowing for exploration of thermal polarization dynamics and phase transitions at individual domain walls. The strong and weak modulation regimes for thermal PFM are discussed, along with the potential applications of the heated probe approach for various functional SPM measurements.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Ulises Acevedo-Salas, Boris Croes, Yide Zhang, Olivier Cregut, Kokou Dodzi Dorkenoo, Benjamin Kirbus, Ekta Singh, Henrik Beccard, Michael Ruesing, Lukas M. Eng, Riccardo Hertel, Eugene A. . Eliseev, Anna N. Morozovska, Salia Cherifi-Hertel
Summary: This study investigates the polarization profile of uncharged 180 degrees domain walls in LiNbO3, and finds that the curvature of the domain wall is correlated with the variation of its internal polarization, resulting in modulations of the Neel-like character. The study suggests that curved interfaces in solid crystals may provide opportunities for tailoring nanoscale polar states.
Article
Physics, Applied
Anna N. Morozovska, Eugene A. Eliseev, Mykola E. Yelisieiev, Yulian M. Vysochanskii, Dean R. Evans
Summary: Using the Landau-Ginzburg-Devonshire approach, the stress-induced transformations of polarization switching in CuInP2S6 nanoparticles of different shapes were studied. The semiconducting properties of the nanoparticles were modeled using a surface-charge layer with a small effective screening length due to the field effect. The results showed a strong and unusual influence of hydrostatic pressure on polarization switching, hysteresis loop shape, magnitude of remanent polarization, and coercive fields.
PHYSICAL REVIEW APPLIED
(2023)
Article
Computer Science, Artificial Intelligence
Yongtao Liu, Anna N. Morozovska, Eugene A. Eliseev, Kyle P. Kelley, Rama Vasudevan, Maxim Ziatdinov, Sergei V. Kalinin
Summary: Using hypothesis-learning-driven automated scanning probe microscopy (SPM), this study investigates the bias-induced transformations in various devices and materials. It is crucial to understand these mechanisms on the nanometer scale with a wide range of control parameters, which is experimentally challenging. The hypothesis-driven SPM autonomously identifies the mechanisms of bias-induced domain switching and reveals the importance of kinetic control.
Article
Chemistry, Multidisciplinary
Yongtao Liu, Anna N. Morozovska, Ayana Ghosh, Kyle P. Kelley, Eugene A. Eliseev, Jinyuan Yao, Ying Liu, Sergei Kalinin
Summary: In this study, the local curvature and strain effects on polarization in CIPS were investigated using piezoresponse force microscopy and spectroscopy. The finite element Landau-Ginzburg-Devonshire model was introduced to explain the observed behaviors and decouple the curvature and strain effects in 2D CIPS. The results showed that bending induced ferrielectric domains in CIPS and the polarization-voltage hysteresis loops differed in bending and nonbending regions. These studies provide important insights into the fabrication of curvature-engineered nanoelectronic devices.
Article
Chemistry, Physical
Kyle P. Kelley, Anna N. Morozovska, Eugene A. Eliseev, Yongtao Liu, Shelby S. Fields, Samantha T. Jaszewski, Takanori Mimura, Sebastian Calderon, Elizabeth C. Dickey, Jon F. Ihlefeld, Sergei V. Kalinin
Summary: Ferroelectricity in binary oxides such as hafnia and zirconia has attracted attention due to unconventional physical mechanisms and potential integration into semiconductor workflows. Recent research suggests that factors such as electrochemical boundary conditions and strain heavily influence the ferroelectric properties. The interplay between ferroelectric and structural instabilities, coupled with non-local screening, explains the emergence of these properties.
Article
Physics, Applied
Anna N. Morozovska, Maksym V. Strikha, Kyle P. Kelley, Sergei V. Kalinin, Eugene A. Eliseev
Summary: This study develops an effective model to describe the charge-polarization coupling behavior between a thin film and graphene, and explains the nonlinear relationship between Landau expansion coefficients and film thickness and chemical composition. The research finds that the polarization of the film strongly influences the conductivity of graphene, and the charge distribution in graphene can be controlled by manipulating the film's electric field dependence.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Multidisciplinary
Anna N. Morozovska, Eugene A. Eliseev, Venkatraman Gopalan, Long-Qing Chen
Summary: We propose an analytical Landau-Ginzburg (LG) theory that describes the charge density waves coupled with lattice and electronic long-range order parameters. The theory is applicable to various long-range order phenomena, such as superconducting Cooper pairs, structural distortions, electric polarization, and magnetization. We introduce a biquadratic coupling between the charge density gradient and the long-range order parameters, which plays a critical role in the appearance of spatially modulated phases in charge-ordered ferroics and high-temperature superconductors.
Article
Materials Science, Multidisciplinary
Anna N. Morozovska, Eugene A. Eliseev, Ayana Ghosh, Mykola E. Yelisieiev, Yulian M. Vysochanskii, Sergei V. Kalinin
Summary: In this study, the strain-induced polarization reversal in a ferroelectric CuInP2S6 (CIPS) thin film with conductive electrodes is explored. The study reveals an unusually strong effect of mismatch strain on the out-of-plane polarization reversal, hysteresis loop shape, dielectric susceptibility, and piezoelectric response of CIPS films.
Article
Physics, Condensed Matter
E. A. Eliseev, M. D. Glinchuk, L. P. Yurchenko, P. Maksymovych, A. N. Morozovska
Summary: In this study, the features of phase transitions in ferroelectric domain walls are theoretically investigated. The findings suggest that these features can be detected using scanning probe capacitance microwave microscopy.
CONDENSED MATTER PHYSICS
(2022)
Article
Physics, Condensed Matter
M. D. Glinchuk, L. P. Yurchenko, E. A. Eliseev
Summary: This review summarizes the theoretical and experimental results obtained in recent years through comprehensive investigations of nanoferroics and multiferroics. The focus is on the spontaneous flexoeffects and reentrant phase in nanoferroics, as well as the recently discovered giant magnetoelectric effect in multiferroics.
CONDENSED MATTER PHYSICS
(2022)
