Article
Materials Science, Multidisciplinary
Tanya Berry, Veronica J. Stewart, Benjamin W. Y. Redemann, Chris Lygouras, Nicodemos Varnava, David Vanderbilt, Tyrel M. McQueen
Summary: This study reports the synthesis and properties of the Zintl compound EuZn2P2 and its electronic structure calculations. The experimental results show that the compound exhibits insulating behavior and undergoes antiferromagnetic ordering at lower temperatures. The magnetic measurements indicate weak anisotropy and competing ferromagnetic and antiferromagnetic interactions. These findings are important for further predictive materials design.
Article
Materials Science, Multidisciplinary
Laura Fanfarillo, Angelo Valli, Massimo Capone
Summary: We demonstrate that the experimental manifestations of nematic order in iron-based superconductors are intrinsically related to electronic correlations in the Hund's correlated metallic state, and cannot be explained using a renormalized quasiparticle picture. Specifically, we find that (i) in a metal where correlations are dominated by the Hund's coupling, nematic ordering does not result in a rigid energy shift in the photoemission spectra, but rather a more complex spectral weight redistribution that reflects the experimental observations, and (ii) the nematic ordering exhibits orbital-selective coherence induced by Hund's physics, consistent with experimental observations.
Article
Physics, Applied
G. A. Ummarino, D. Torsello
Summary: In this study, we calculated the critical temperature and order parameter symmetry of a multiband system using the s +/- + d-wave Eliashberg theory. We found that the system exhibits twofold in-plane symmetry and undergoes a transition from nodal to fully gapped state with increasing temperature.
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
(2022)
Article
Physics, Multidisciplinary
Qianni Jiang, Yue Shi, Morten H. Christensen, Joshua J. Sanchez, Bevin Huang, Zhong Lin, Zhaoyu Liu, Paul Malinowski, Xiaodong Xu, Rafael M. Fernandes, Jiun-Haw Chu
Summary: In this study, the authors investigate the nematic susceptibility and its relationship with spin fluctuations in Fe1+yTe1-xSex using elastoresistivity measurement. They find that the nematic fluctuations in two symmetry channels are closely linked to the corresponding spin fluctuations, and observe an unusual temperature dependence of the nematic susceptibility attributed to the loss of coherence of the d(xy) orbital. The research highlights the importance of orbital differentiation on the nematic properties of iron-based materials.
COMMUNICATIONS PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Tommaso Gorni, Diego Florez-Ablan, Luca de'Medici
Summary: In this study, we calculate the electronic properties of the normal state of uncollapsed LaFe2As2, considering local dynamical correlations. Our results show that LaFe2As2 has a reduced bare bandwidth, which explains the substantial correlations despite its nominal valence d6.5.
Article
Materials Science, Multidisciplinary
Mehdi Hesani, Kourosh Rahimi, Ahmad Yazdani
Summary: The study investigated the relationship between charge doping and correlations in BaFe2As2 using DFT+DMFT, showing that electronic correlations strengthen systematically from electron-doping to hole-doping regimes. Due to its multi-orbital nature, correlations in BaFe2As2 are orbital-dependent, with the Fe-3d(xy) orbital exhibiting the most correlation.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Physics, Multidisciplinary
Xinyang Dong, Emanuel Gull, Andrew J. Millis
Summary: This study investigates the contribution of electron-spin-fluctuation coupling to the superconducting state in a two-dimensional Hubbard model using the dynamical cluster approximation. The findings suggest that only about half of the superconductivity can be attributed to the pairing mechanism involving spin fluctuations as pairing bosons in the standard one-loop theory.
Article
Physics, Multidisciplinary
Annabelle Bohrdt, Lukas Homeier, Immanuel Bloch, Eugene Demler, Fabian Grusdt
Summary: Studies suggest that high-temperature pairing of fermions can be achieved in bilayer models, utilizing the energy gained by one charge when it follows the path created by another charge.
Article
Materials Science, Multidisciplinary
H. Pfau, M. Yi, M. Hashimoto, T. Chen, P-C Dai, Z-X Shen, S-K Mo, D. Lu
Summary: The study investigates the influence of electronic nematicity on quasiparticle coherence in detwinned FeSe using ARPES, finding an anisotropy between dxz and dyz orbitals and a more coherent dxz orbital compared to the dyz orbital. This observation contrasts with earlier predictions and underscores the importance of electronic correlations in describing nematicity.
Article
Materials Science, Multidisciplinary
Jianzhou Zhao, Yilin Wang, Xiaolong Feng, Shengyuan A. Yang
Summary: By comparing the electronic structures of LaFe2As2 and CaFe2As2, researchers found that they are similar in terms of electronic correlation and Fermi-surface topology, suggesting that superconductivity may also be induced in the collapsed phase of LaFe2As2 under similar conditions as for CaFe2As2.
Article
Chemistry, Physical
Jian-Xiang Qiu, Christian Tzschaschel, Junyeong Ahn, Anyuan Gao, Houchen Li, Xin-Yue Zhang, Barun Ghosh, Chaowei Hu, Yu-Xuan Wang, Yu-Fei Liu, Damien Berube, Thao Dinh, Zhenhao Gong, Shang-Wei Lien, Sheng-Chin Ho, Bahadur Singh, Kenji Watanabe, Takashi Taniguchi, David C. Bell, Hai-Zhou Lu, Arun Bansil, Hsin Lin, Tay-Rong Chang, Brian B. Zhou, Qiong Ma, Ashvin Vishwanath, Ni Ni, Su-Yang Xu
Summary: Using circularly polarized light, researchers have observed helicity-dependent optical control of fully compensated antiferromagnetic order in a topological axion insulator called MnBi2Te4. This optical control and circular dichroism are based on the optical axion electrodynamics and can potentially be used to control PT-symmetric antiferromagnets and create dissipationless circuits using topological edge states.
Article
Materials Science, Multidisciplinary
Santanu Pakhira, Y. Lee, Liqin Ke, V Smetana, A- Mudring, Thomas Heitmann, David Vaknin, D. C. Johnston
Summary: CaCo2-yAs2 is a unique itinerant system with strong magnetic frustration, wherein Ni substitutions for Co lead to enhanced ferromagnetic fluctuations and suppressed antiferromagnetic order. Density-functional theory (DFT) calculations confirm the enhancement of FM fluctuations in Ca(Co1-xNix)(2-y)As-2.
Article
Physics, Multidisciplinary
Daniel Abutbul, Daniel Podolsky
Summary: The study demonstrates that in systems of spinful particles with strong spin interactions, lattice melting leads to a tetratic phase separating solid from liquid, containing free dislocation pairs and bound disclinations. The spins in the tetratic phase are shown to be antiferromagnetically ordered as allowed by their spatial configuration.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Condensed Matter
J. M. Wilde, A. Sapkota, Q-P Ding, M. Xu, W. Tian, S. L. Bud'ko, Y. Furukawa, A. Kreyssig, P. C. Canfield
Summary: The magnetic order of Mn-doped CaK(Fe1-xMnx)(4)As-4 compounds is consistent with the hedgehog spin vortex crystal (hSVC) order found in Ni-doped CaKFe4As4. The hSVC state is characterized by stripe-type propagation vectors and simple antiferromagnetic stacking. The hSVC state in Mn-doped 1144 compound coexists with superconductivity and shows a quantum phase transition associated with the suppression of the AFM transition temperature.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Kshiteej Deshmukh, Timothy Breitzman, Kaushik Dayal
Summary: This work presents a dynamic linear homogenization approach for periodic metamaterials, providing a homogenized equation that is valid over a broad range of frequencies. It applies to problems with scalar unknown fields in one and two spatial dimensions, offering accurate predictions for wave scattering and multiple scattered propagating waves. The method has high accuracy and computational efficiency.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
