Article
Chemistry, Multidisciplinary
Anupam Bhim, Jean-Pascal Sutter, Jagannatha Gopalakrishnan, Srinivasan Natarajan
Summary: In this study, the stuffed tridymite structure Ba(Zn/Co)(1-x)Si1-xM2xO4 (M=Al3+ and Fe3+) was synthesized and explored for possible multiferroic behavior, leading to the development of new inorganic colored materials. A compound BaCo0.75Si0.75Fe0.5O4 was identified as a multiferroic material with weak ferromagnetic behavior. Optical studies revealed different colors based on the metal ions and charge transfer effects in the compounds.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Nanoscience & Nanotechnology
Monica J. Garcia-Rodriguez, Oswaldo Sanchez-Dena, Omar A. Velasco-Cortez, Cesar L. Ordonez-Romero, Milton O. Vazquez-Lepe, Christian Jonin, Rurik Farias, Pierre-Francois Brevet, Jorge-Alejandro Reyes-Esqueda
Summary: Random granular media can exhibit characteristics related to ordered media, as observed in the polarized Second Harmonic Generation (SHG) response from reduced iron-doped lithium niobate (LN:Fe) powders due to multiple scattering. The SHG response can be controlled by magnetic induction. The study also reveals the importance of a reducing atmosphere for modifying the SHG response of LN:Fe powders.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Wei Li, Yunpeng Ma, Tianyi Feng, Ziwan Du, Yixuan Liu, Sergei Kalinin, Jing-Feng Li, Qian Li
Summary: Understanding symmetry breaking in ferroelectric materials is crucial for manipulating their functional properties. We developed a spectral imaging method using optical second harmonic generation to investigate the mechanisms behind crystallographic symmetry breaking. By studying (K,Na)NbO3 single crystals, we demonstrated the method's ability to analyze domain variants and their thermal evolution across phase transitions. The method can be extended to other ferroelectric materials with potential enhancements.
JOURNAL OF MATERIOMICS
(2023)
Article
Optics
Ying Song, Weiming Wang, Yanchao Wang, Yuwei Shan, Jin Luo Cheng, J. E. Sipe
Summary: We experimentally study the tunability of second harmonic generation (SHG) in a 2D material/dielectric film/substrate layered structure. The tunability arises from two interferences: one between the incident fundamental light and its reflected light, and the other between the upward SH light and the reflected downward SH light. We demonstrate variations of three orders of magnitude in the SHG signals from a monolayer MoS2/TiO2/Ag layered structure.
Article
Optics
A. Pakhomov, M. Hammerschmidt, S. Burger, T. Pertsch, F. Setzpfandt
Summary: By investigating surface second-harmonic generation from a stack of dielectric layers, we found that surface responses from all interfaces can efficiently sum up in deeply subwavelength thicknesses, leading to enhanced efficiency of SHG. This surface-driven nonlinearity can be comparable to bulk nonlinearity in noncentrosymmetric semiconductors and can offer high performance for nonlinear nanophotonic applications.
Article
Nanoscience & Nanotechnology
Rabindra Biswas, Asish Prosad, Lal A. S. Krishna, Sruti Menon, Varun Raghunathan
Summary: This study demonstrates the enhancement of second harmonic generation (SHG) from multilayer structures of gallium selenide (GaSe) flakes integrated with Fabry-Perot structures using hybrid-genetic optimization (HGA). The HGA technique significantly speeds up the design process and achieves 128-fold and 400-fold SHG enhancement in single and double GaSe structures, respectively, compared to a reference sample. The SHG conversion efficiencies obtained from the HGA structures are significantly higher than previous reports on 2D material integrated resonant metasurfaces or Bragg cavities.
Article
Optics
Jie Xu, Eric Plum, Vassili Savinov, Nikolay Zheludev
Summary: In this study, second harmonic generation was demonstrated using an amorphous silicon metamaterial fabricated on the tip of an optical fiber. The metamaterial is a double-chevron array that supports a closed-mode resonance for the fundamental wavelength at 1510 nm, with a quality factor of 30. The normalized resonant second harmonic conversion efficiency calculated per intensity and square of interaction length is approximately 10(-11) W-1, exceeding the previously achieved value for a silicon metamaterial by two orders of magnitude.
Article
Materials Science, Multidisciplinary
Fan Yang, Cristian Ciraci
Summary: We present a theoretical study on second-harmonic generation from a singular metasurface, which strongly interacts with incident light and generates intense surface polarization, resulting in the generation of second-harmonic field. By using transformation optics, the calculation of nonlinear optical response is simplified, and the dependence on the incident angle is weak, making it potentially useful for all-angle harmonic generation. Furthermore, we investigate the symmetry dependence of second-harmonic generation in the far field and demonstrate an enhanced conversion efficiency under normal incidence by breaking the surface inversion symmetry.
Article
Materials Science, Multidisciplinary
Li Wang, Shivashankar R. Vangala, Stefan Popien, Marcus Beutler, Vladimir L. Tassev, Valentin Petrov
Summary: This study demonstrates second-harmonic generation in orientation-patterned GaAs0.85P0.15, grown by hydride vapor phase heteroepitaxy on an orientation-patterned GaAs template, using ultrashort pulses with an internal conversion efficiency exceeding 19%.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Joonhyuk Kee, Kang Min Ok
Summary: Four chiral coordination polymers were synthesized with the aid of a newly designed chiral ligand under hydrothermal conditions. These polymers exhibit strong second-harmonic generation efficiency, which is attributed to the polarizable metal cations and synergistic effect in the donor-acceptor system.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Multidisciplinary Sciences
Shingo Toyoda, Manfred Fiebig, Taka-hisa Arima, Yoshinori Tokura, Naoki Ogawa
Summary: Mirror symmetries play a crucial role in fundamental properties and conservation laws, with potential magnetoelectric cross-coupling when both spatial inversion and time reversal are broken. The giant nonreciprocal optical response observed in SHG of CuB2O4 is due to interference between magnetic-dipole and electric-dipole contributions, showing the potential for nonreciprocal nonlinear optical functionalities in multiferroics and magnetoelectrics. Resonantly enhanced magnetic-dipole transitions contribute significantly to the nonreciprocity, maximizing the effect despite the inherently weaker nature compared to electric-dipole transitions.
Article
Chemistry, Multidisciplinary
Jiaqian Zhou, Peiran Xie, Chao Wang, Tieyuan Bian, Jian Chen, Yang Liu, Zhu Guo, Congcong Chen, Xin Pan, Min Luo, Jun Yin, Lingling Mao
Summary: This study reports the synthesis of 15 new Bi-based double perovskite derived halides with the general formula of A(2)BBiX(6) (A=organic cationic ligand, B=K or Rb, X=Br or I). The materials were synthesized using organic ligands to coordinate with metal ions, resulting in diverse structure types with distinct dimensionalities and connectivity modes. The optical band gaps of these materials can be tuned by changing the halide, the organic ligand, and the alkali metal. The findings provide new structural types to the double perovskite family and offer a powerful synthetic handle for symmetry breaking.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Multidisciplinary Sciences
Shivangi Shree, Delphine Lagarde, Laurent Lombez, Cedric Robert, Andrea Balocchi, Kenji Watanabe, Takashi Taniguchi, Xavier Marie, Iann C. Gerber, Mikhail M. Glazov, Leonid E. Golub, Bernhard Urbaszek, Ioannis Paradisanos
Summary: Efficient second-harmonic generation (SHG) occurs for crystals with broken inversion symmetry, such as transition metal dichalcogenide monolayers. Here the authors show SHG tuning in bilayer MoS2 - an inversion-symmetric crystal - mediated by interlayer excitons.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Andrew J. Craig, Jeong Bin Cho, Seung Han Shin, Seung Heon Ha, Stanislav S. Stoyko, Joon I. Jang, Jennifer A. Aitken
Summary: Eighteen isotypic, lithium-containing rare-earth sulfides with the La3CuSiS7-structure type have been synthesized and characterized. These compounds are semiconductors with wide optical bandgaps in the visible region. They exhibit high thermal stability and potentially broad regions of optical transparency in the infrared regime. Two of these compounds, Ce3LiGeS7 and Ce3LiSnS7, show significant second-harmonic generation responses and high laser-induced damage threshold values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Review
Biochemistry & Molecular Biology
Yi Hou, Jianhui Li, Bifei Li, Qunhui Yuan, Wei Gan
Summary: This article reviews the latest advances in studying the dynamic behaviors of molecules on lipids using spectroscopic methods such as second harmonic generation and two-photon fluorescence, showing the potential of this combined approach.
Article
Nanoscience & Nanotechnology
Mads C. Weber, Yannik Zemp, Morgan Trassin, Arkadiy Simonov, Jakob Schaab, Bin Gao, Sang-Wook Cheong, Thomas Lottermoser, Manfred Fiebig
Summary: This study focuses on the polar domain structure and hysteresis behavior in hybrid improper ferroelectrics, highlighting differences with proper and improper ferroelectrics, such as asymmetric phase transitions and the expansion of nonpolar phases into polar phases during the transition process.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Physics, Applied
Pieter Gypens, Naemi Leo, Matteo Menniti, Paolo Vavassori, Jonathan Leliaert
Summary: Nanomagnetic logic offers a fast, energy-efficient, and reconfigurable platform for in-memory computation that can be controlled via optical means. Local heating through plasmon-assisted photoheating allows for the design of reconfigurable nanomagnetic Boolean logic gates.
PHYSICAL REVIEW APPLIED
(2022)
Article
Materials Science, Multidisciplinary
Amade Bortis, Morgan Trassin, Manfred Fiebig, Thomas Lottermoser
Summary: In this study, phase-field simulations were used to demonstrate how interfaces can be utilized to control the formation of charged domain walls, including the ability to select the dominant domain-wall type through appropriate thin-film engineering. The influence of interfaces on the type and distribution of domain walls provides a means to control the transport properties of materials.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Multidisciplinary Sciences
Ehsan Hassanpour, Yannik Zemp, Yusuke Tokunaga, Yasujiro Taguchi, Yoshinori Tokura, Thomas Lottermoser, Manfred Fiebig, Mads C. Weber
Summary: In this study, we demonstrate the reversible transfer of a domain pattern between magnetization and electric-polarization space in a multiferroic material. The magnetic field can transfer a ferromagnetic domain pattern into an identical ferroelectric domain pattern while erasing it at its magnetic origin. This finding has important implications for the application of multiferroic materials.
Article
Chemistry, Multidisciplinary
Martin F. F. Sarott, Ursina Bucheli, Adrian Lochmann, Manfred Fiebig, Morgan Trassin
Summary: The integration of reliable thin-film ferroelectrics into oxide electronics requires understanding the interplay of growth parameters on polarization. In this study, the polarization of strained PZT films is investigated during epitaxial growth and it is found that the orientation of the polarization can change after growth completion. The temperature and oxygen partial pressure during growth significantly affect the polarization orientation, with higher temperature and oxygen pressure favoring a uniform downward polarization. The mechanism of polarization reorientation is attributed to the formation of a charged Pb defect gradient toward the film surface.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Nanoscience & Nanotechnology
Chia-Jung Yang, Jingwen Li, Manfred Fiebig, Shovon Pal
Summary: This Review summarizes the use of THz light to drive quantum materials out of equilibrium and retrieve information on the associated correlation processes and many-body dynamics. THz light is shown to induce superconducting-like features in layered superconductors and drive quasiparticles in heavy-fermion systems out of equilibrium. It also provides examples of phase transitions driven dynamically by pumping correlated systems using THz light.
NATURE REVIEWS MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Olav W. Sandvik, Aaron Merlin Mueller, Hakon W. Anes, Manuel Zahn, Jiali He, Manfred Fiebig, Thomas Lottermoser, Tadej Rojac, Dennis Meier, Jan Schultheiss
Summary: Mechanical pressure is able to control the structure, electric and magnetic order in solid-state systems, allowing the modification of their physical properties. In this study, we investigate the effect of pressure on a nonferroelastic ferroelectric material, ErMnO3, which is characterized by the absence of classical stress-strain coupling and the formation of domains governed by creation-annihilation processes of topological defects. By annealing ErMnO3 polycrystals under different pressure conditions, we demonstrate the transformation of nonferroelastic vortex-like domains into stripe-like domains, whose width is determined by the applied pressure. This work presents the possibility to utilize mechanical pressure for domain engineering in nonferroelastic ferroelectrics and provides a means to control their dielectric and piezoelectric responses.
Article
Chemistry, Physical
Elzbieta Gradauskaite, Quintin N. Meier, Natascha Gray, Martin F. Sarott, Tizian Scharsach, Marco Campanini, Thomas Moran, Alexander Vogel, Karla Del Cid-Ledezma, Bryan D. Huey, Marta D. Rossell, Manfred Fiebig, Morgan Trassin
Summary: This paper reports the stabilization of ultrathin out-of-plane ferroelectricity in oxide heterostructures through the design of an artificial flux-closure architecture. By inserting an in-plane-polarized ferroelectric epitaxial buffer, the continuity of polarization at the interface is maintained, resulting in the emergence of polarization in ultrathin ferroelectric films.
Article
Physics, Multidisciplinary
Chia-Jung Yang, Kristin Kliemt, Cornelius Krellner, Johann Kroha, Manfred Fiebig, Shovon Pal
Summary: Using terahertz time-domain spectroscopy, evidence for fermionic critical slowing down in YbRh2Si2 close to a quantum phase transition is found. The heavy-fermion quasiparticles in the heavy-Fermi-liquid state break down at the transition, as indicated by measurements of critical slowing down. This breakdown of heavy-fermion quasiparticles near the quantum phase transition could classify this system among a wider family of fermionic quantum phase transitions that is yet to be fully explored.
Article
Materials Science, Multidisciplinary
Ami S. Koshikawa, Justin Llandro, Masayuki Ohzeki, Shunsuke Fukami, Hideo Ohno, Naemi Leo
Summary: Three-dimensional magnetic metamaterials with interesting phenomena arising from the interplay of material properties, anisotropy, curvature, and connectivity have attracted attention. Nanoscale gyroids, which have a highly interconnected chiral network reminiscent of artificial spin ices, are particularly interesting. In this study, finite-element micromagnetic simulations were used to investigate the anisotropic behavior of nanoscale nickel gyroid networks under applied fields. The results demonstrate the potential of extended gyroid networks for future spintronic functionalities, such as neuromorphic computing and nonreciprocal transport.
Article
Physics, Multidisciplinary
Gabriele De Luca, Manfred Fiebig
Summary: By using nondestructive remote probing and symmetry analysis, we can distinguish the coexisting polar orientations in tetragonal ferroelectric films and quantify the volumetric ratio between different polarized domains.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Jialiang Gao, Charles-Henri Lambert, Richard Schlitz, Manfred Fiebig, Pietro Gambardella, Saul Velez
Summary: By using nonlocal harmonic voltage measurements, the researchers investigated magnon transport in perpendicularly magnetized ultrathin Tm3Fe5O12 (TmIG) films coupled to Pt electrodes. They found that the first harmonic nonlocal voltage captures spin-driven magnon transport, while the second harmonic is dominated by thermoelectric voltages driven by current-induced thermal gradients at the detector. The researchers also determined the magnon diffusion length and the different components of the thermoelectric voltages in TmIG.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Nives Strkalj, Amade Bortis, Marco Campanini, Marta D. Rossell, Manfred Fiebig, Morgan Trassin
Summary: An exotic coexistence of polar states in ferroelectric|dielectric PbTiO3|SrTiO3 heterostructures has been investigated using optical second harmonic generation. The phase coexistence was identified down to a single PTO|STO bilayer and interlayer coupling was found to play an important role in setting the final polarization state. These findings demonstrate the potential of noninvasive optical techniques for understanding complex ordering of dipole moments in oxide heterostructures.
