Article
Chemistry, Multidisciplinary
Zhenwei Ou, Bin Peng, Weibin Chu, Zhe Li, Cheng Wang, Yan Zeng, Hongyi Chen, Qiuyu Wang, Guohua Dong, Yongyi Wu, Ruibin Qiu, Li Ma, Lili Zhang, Xiaoze Liu, Tao Li, Ting Yu, Zhongqiang Hu, Ti Wang, Ming Liu, Hongxing Xu
Summary: In this study, the carrier transport behavior mediated by the electron-phonon coupling in BiFeO3 epitaxial thin films is directly observed. Acoustic phonons generated by the inverse piezoelectric effect are coupled with photocarriers, leading to the observation of a doughnut shape carrier distribution. The results provide an effective approach to investigate the effects of electron-phonon interactions and are of great importance for designing and improving electronic devices.
Article
Materials Science, Multidisciplinary
Gabriel Antonius, Steven G. Louie
Summary: This article discusses the effects of the electron-phonon interaction on optical excitations and presents a practical expression for the exciton-phonon self-energy. This expression describes the temperature dependence of the optical transition energies and their lifetime broadening resulting from the interaction between excitons and phonons.
Article
Materials Science, Multidisciplinary
B. Karthikeyan
Summary: The present study extensively investigated the optical and Raman spectral properties of Ni-doped CuO nanoparticles prepared using the sol-gel method. The results showed a redshift in Raman peak position due to the doping of Ni ions. The influence of Ni doping on electron-phonon coupling and phonon lifetimes was thoroughly studied in this work.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Optics
Andrei Bylinkin, Martin Schnell, Marta Autore, Francesco Calavalle, Peining Li, Javier Taboada-Gutierrez, Song Liu, James H. Edgar, Felix Casanova, Luis E. Hueso, Pablo Alonso-Gonzalez, Alexey Y. Nikitin, Rainer Hillenbrand
Summary: The study demonstrates vibrational strong coupling between propagating phonon polaritons in thin van der Waals crystals and molecular vibrations in adjacent thin molecular layers through nanoimaging. Near-field polariton interferometry shows the formation of a propagating hybrid mode with a pronounced anti-crossing region, exhibiting propagation with negative group velocity. Numerical calculations predict vibrational strong coupling in nanometre-thin molecular layers and phonon polaritons in few-layer van der Waals materials, making propagating phonon polaritons a promising platform for ultrasensitive on-chip spectroscopy and strong-coupling experiments.
Article
Optics
Shuangqiang Fang, Ying Li, Peiqing Cai, Qiangqiang Zhu, Yue Zhai, Hong Zhang, Mingsheng Cai, Tianchun Lang, Le Wang
Summary: Optical temperature measurement is a reliable and advanced technology. However, most optical sensing materials are used in high temperature range. This study reports a cryogenic optical sensing material Cr3+-doped SrGa12O19, which exhibits superior cryogenic sensing performance based on fluorescence intensity ratio method.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
C. Li, N. H. Protik, P. Ordejon, D. Broido
Summary: This study reveals a significant enhancement in the thermopower of lightly doped diamond, primarily due to exceptionally weak anharmonic phonon decay below 100K that enables efficient momentum exchange between charge carriers and phonons. Furthermore, exceedingly large thermoelectric power factors are identified.
MATERIALS TODAY PHYSICS
(2022)
Article
Optics
D. G. Suarez-Forero, D. W. Session, M. Jalali Mehrabad, P. Knuppel, S. Faelt, W. Wegscheider, M. Hafezi
Summary: The interplay between time-reversal symmetry breaking and strong light-matter coupling in two-dimensional gases brings intriguing aspects to polariton physics. This combination can lead to a polarization/spin-selective light-matter interaction in the strong coupling regime. We demonstrate circular-polarization dependence of the vacuum Rabi splitting by coupling a 2D gas in the quantum Hall regime to a microcavity, providing a quantitative understanding of the phenomenon.
Article
Chemistry, Physical
Xiaomin Xu, Xiaohu Wang, Pu Chang, Xiaoyu Chen, Lixiu Guan, Junguang Tao
Summary: In this work, the spin-phonon coupling effect in the two-dimensional magnetic semiconductor CrSBr is investigated using density-functional theory. It is found that the phonon vibrations are strongly influenced by the spin ordering, and the SPC constant in CrSBr is one order of magnitude larger than that in most other 2D materials. Furthermore, lattice deformation can tune the Curie temperature of the system and enhance the thermal conductivity.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
M. Yarmohammadi, M. Krebs, G. S. Uhrig, B. Normand
Summary: Magnetophononics, the modulation of magnetic interactions by driving infrared-active lattice excitations, allows for ultrafast dynamical control of spin systems by light. In quantum magnets with strong spin-phonon coupling, resonances between driven phonons and spin excitations exhibit an intrinsic self-blocking effect, resulting in only a fraction of the laser power being absorbed by the phonons.
Article
Materials Science, Multidisciplinary
A. Ceferino, S. J. Magorrian, V Zolyomi, D. A. Bandurin, A. K. Geim, A. Patane, Z. D. Kovalyuk, Z. R. Kudrynskyi, I. Grigorieva, V. Fal'ko
Summary: The paper demonstrates the tunability of spin-orbit coupling strength in few-layer gamma-InSe films, potentially enabling electrically switchable spintronic devices. Theoretical calculations and experimental measurements show good agreement in terms of Dyakonov-Perel spin relaxation due to SOC.
Article
Chemistry, Physical
Xiaoze Liu, Jun Yi, Sui Yang, Erh-Chen Lin, Yue-Jiao Zhang, Peiyao Zhang, Jian-Feng Li, Yuan Wang, Yi-Hsien Lee, Zhong-Qun Tian, Xiang Zhang
Summary: Nonlinear phonon scattering in monolayer MoS2 strongly coupled to a plasmonic cavity mode has been demonstrated, showing enhanced valley polarization and sustained coherence in the stimulated regime. This suggests the potential of valley-cavity-based systems for various applications in cavity quantum electrodynamics.
Article
Multidisciplinary Sciences
Jiaji Ma, Ruihan Yang, Hanghui Chen
Summary: By using first-principles methods, the study reveals a strong coupling between itinerant electrons and soft polar phonons in doped strong ferroelectrics, deviating from the weakly coupled electron mechanism proposed by Anderson/Blount. The total electron-phonon coupling in doped BaTiO3 increases to about 0.6 around the critical concentration, enabling the induction of phonon-mediated superconductivity. Introducing epitaxial strain to lower the crystal symmetry of doped BaTiO3 further boosts the superconducting temperature through a substantial coupling between itinerant electrons and acoustic phonons.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Te-Huan Liu, Jiawei Zhou, Qian Xu, Xin Qian, Bai Song, Ronggui Yang
Summary: The study shows that long-range electron-phonon interaction can significantly suppress thermal conductivity in certain polar semiconductors by scattering acoustic phonons. The breaking of centrosymmetry has different effects on phonon transport in different crystal structures.
MATERIALS TODAY PHYSICS
(2022)
Article
Chemistry, Physical
Junbo He, Xudan Zhu, Weiming Liu, Ertao Hu, Jianlu Wang, Rongjun Zhang
Summary: This study experimentally reveals the electronic structures and electron-phonon interaction in layered PtSe2 material. It is found that with increasing layer number, the band gap shows a red-shifting trend, and the strength of e-ph interaction and average phonon energy decline.
Article
Nanoscience & Nanotechnology
Hagen Poddig, Dean Hobbis, Thomas Doert, George S. Nolas
Summary: The chemistry of new materials and the effects of chemical substitutions on physical properties continue to be of intense interest, with the synthesis and temperature-dependent transport properties of GdTe1.62Se0.18 revealing polaronic transport. Strong electron-phonon coupling is observed in this material, which also exhibits low thermal conductivity due to crystal structure and disorder in the Te-2(2-) anion.
SCRIPTA MATERIALIA
(2021)
Article
Physics, Multidisciplinary
Elze J. Knol, Brian Kiraly, Alexander N. Rudenko, Werner M. J. van Weerdenburg, Mikhail Katsnelson, Alexander A. Khajetoorians
Summary: In this study, the influence of an electric field on atomic orbital memory was investigated. It was found that the state favorability of a cobalt atom was greatly affected by the local electric field.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Physical
Evgeny A. Stepanov, Viktor Harkov, Malte Rosner, Alexander Lichtenstein, Mikhail Katsnelson, Alexander N. Rudenko
Summary: Recently fabricated InSe monolayers exhibit remarkable characteristics that indicate the potential of this material to host a number of many-body phenomena. In this work, the collective electronic effects in hole-doped InSe monolayers are systematically described, and it is found that the electron-phonon interaction does not play a crucial role in these effects, while the electronic structure and Coulomb interactions play important roles.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Swagata Acharya, Dimitar Pashov, Alexander N. Rudenko, Malte Rosner, Mark van Schilfgaarde, Mikhail Katsnelson
Summary: Excitons in CrX3 have been studied and characterized using an advanced first principles parameter-free approach. The study reveals that the formation of excitons in CrX3 is primarily influenced by the dp hybridization between Cr and X, which acts as a symmetry-breaking mechanism. The study also shows that the spectral weight shared with the ligand halogen states increases as the dp hybridization enhances. Additionally, the intensity and position of the exciton peaks can be altered by changing the two-particle Hamiltonian. The study highlights the susceptibility of excitons in CrI3 to environmental screening and spin-orbit coupling.
NPJ 2D MATERIALS AND APPLICATIONS
(2022)
Article
Physics, Multidisciplinary
Pantelis Bampoulis, Carolien Castenmiller, Dennis J. Klaassen, Jelle van Mil, Yichen Liu, Cheng-Cheng Liu, Yugui Yao, Motohiko Ezawa, Alexander N. Rudenko, Harold J. W. Zandvliet
Summary: We provide experimental evidence of a topological phase transition in germanene, a monoelemental quantum spin Hall insulator. By applying a critical perpendicular electric field, the topological gap is closed and germanene becomes a Dirac semimetal. Further increasing the electric field results in the opening of a trivial gap and the disappearance of metallic edge states. This switching of the topological state induced by an electric field, combined with the large gap, makes germanene suitable for room-temperature topological field-effect transistors, which could revolutionize low-energy electronics.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Physical
Alexander N. Rudenko, Malte Rosner, Mikhail I. Katsnelson
Summary: Monolayer CrSBr is a recently discovered semiconducting spin-3/2 ferromagnet with a Curie temperature of around 146 K. The orthorhombic lattice of CrSBr gives rise to spatial anisotropy of magnetic excitations within the 2D plane. We employ a Green's function formalism combined with first-principles calculations to study the magnetic properties of monolayer CrSBr in different regimes of surrounding dielectric screening. In the free-standing limit, the system is close to an easy-plane magnet, while in the regime of large external screening, monolayer CrSBr behaves like an easy-axis ferromagnet with more stable magnetic ordering.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Marco Bianchi, Swagata Acharya, Florian Dirnberger, Julian Klein, Dimitar Pashov, Kseniia Mosina, Zdenek Sofer, Alexander N. Rudenko, Mikhail I. Katsnelson, Mark van Schilfgaarde, Malte Roesner, Philip Hofmann
Summary: We investigate the electronic structure of paramagnetic CrSBr through first-principles calculations and angle-resolved photoemission spectroscopy. By using a supercell approximation and quasiparticle self-consistent GW theory with excitonic vertex corrections, we calculate the paramagnetic phase with broken long-range order. Comparing the calculated quasiparticle band structure with experimental photoemission data at 200 K shows excellent agreement, allowing us to explain the broadening of some bands due to broken magnetic order and/or electronic dispersion perpendicular to the quasi-two-dimensional layers. The experimental band gap at 200 K is found to be at least 1.51 eV, while calculations suggest a larger gap of approximately 2.1 eV at lower temperature.
Article
Chemistry, Physical
R. Caglayan, Y. Mogulkoc, A. Mogulkoc, M. Modarresi, A. N. Rudenko
Summary: In this study, the absorption of F and Cl on ferromagnetic monolayer CrN was investigated using first-principles calculations. It was found that the magnetic properties of CrN can be altered after the adsorption of F and Cl, opening a route to the detection of these gases using magnetic or optical measurements.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Anuroopa Behatha, Tulika Maitra, Alexander N. Rudenko, V. Kanchana
Summary: This study investigates the structural, magnetic, and electronic properties as well as orbital ordering in layered perovskite-type AMnF(4) (A=K, Rb) from first principles, revealing interesting phenomena such as nodal-line-like dispersion and quasi-two-dimensional magnetism.
Article
Physics, Multidisciplinary
Brian Kiraly, Elze J. Knol, Alexander N. Rudenko, Mikhail Katsnelson, Alexander A. Khajetoorians
Summary: This study demonstrates the orbital memory ability of individual iron atoms on the surface of black phosphorus and discovers that the iron orbital memory can be switched in its non-ionized ground state. By studying the variation of tunneling conditions, a two-electron tunneling process is proposed as the switching mechanism of the valency of iron atoms.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Alexander N. Rudenko, Swagata Acharya, Ferenc Tasnadi, Dimitar Pashov, Alena Ponomareva, Mark van Schilfgaarde, Igor A. Abrikosov, Mikhail Katsnelson
Summary: A systematic study comparing the electronic and optical properties of crystalline black nitrogen (BN) and black phosphorus (BP) reveals significant differences between the two materials. BN has a larger optical gap and shows transparency in the visible spectral region with highly anisotropic optical response. The reduced dielectric screening in BN enhances the effective Coulomb interaction.
Article
Materials Science, Multidisciplinary
Yaroslav O. Kvashnin, Alexander N. Rudenko, Patrik Thunstrom, Malte Rosner, Mikhail Katsnelson
Summary: In this study, the magnetic and spectral properties of monolayer chromium triiodide were investigated using first-principles methods. The presence of strong local Coulomb interactions led to the formation of local magnetic moments on chromium, and the existence of local dynamical correlations modified the electronic structure of ferromagnetically ordered CrI3. The results obtained in this study were closer to experimental results compared to conventional methods.
Article
Materials Science, Multidisciplinary
Pengfei Lv, Jose Angel Silva-Guillen, Alexander N. Rudenko, Shengjun Yuan
Summary: This paper investigates the deposition of germanene on MoS2 using density functional theory calculations. The study suggests that native defects in MoS2 samples lead to charge transfer between germanene and MoS2, while the substitution of molybdenum by group IV-V and VII transition metal atoms results in charge puddles.
Article
Materials Science, Multidisciplinary
Swagata Acharya, Dimitar Pashov, Brian Cunningham, Alexander N. Rudenko, Malte Rosner, Myrta Gruning, Mark van Schilfgaarde, Mikhail Katsnelson
Summary: The study investigates the electronic band structure of freestanding monolayers of chromium trihalides using an advanced theoretical approach, revealing the changes in the valence band shape with different halogens and the impact of QSG (W) over cap on system localization in comparison to QSGW. Weak perturbations can flip the valence band structures between these two solutions in the materials, highlighting the sensitivity of the band structure to external factors.
Article
Materials Science, Multidisciplinary
Zhenwei Wang, Weiqing Zhou, A. N. Rudenko, Shengjun Yuan
Summary: The study proposes cuprous oxide as a host material for nodal net phonons, with nontrivial phonon surface states and uncovered phononic arcs visible in the k-resolved phonon spectra, offering a possible platform for experimental detection and realization of topologically nontrivial phonon states.
Article
Materials Science, Multidisciplinary
Manuel Steinbrecher, Werner M. J. van Weerdenburg, Etienne F. Walraven, Niels P. E. van Mullekom, Jan W. Gerritsen, Fabian D. Natterer, Danis Badrtdinov, Alexander N. Rudenko, Vladimir V. Mazurenko, Mikhail Katsnelson, Ad van der Avoird, Gerrit C. Groenenboom, Alexander A. Khajetoorians
Summary: The research successfully determined the fine structure and geometry of an individual titanium-hydride molecule using a newly developed ESR scanning tunneling microscope in combination with ab initio methods, demonstrating a significant anisotropy of the g tensor. The findings provide insight into the structure and dynamics of individual molecules.
