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
Chemistry, Physical
Junqing Xu, Yuan Ping
Summary: Understanding the effects of different substrates on the spin dynamics and relaxation is crucial for spin-based information technologies, particularly for materials with strong spin-orbit coupling (SOC). In this study, we performed simulations to investigate the spin lifetimes (tau(s)) of supported/free-standing germanene, a 2D Dirac material with strong SOC, using first-principles real-time density-matrix dynamics with SOC, electron-phonon, and electron-impurity scattering. Surprisingly, we found that the substrate effects on tau(s) can differ by two orders of magnitude, and are closely related to the substrate-induced modifications of the SOC-field anisotropy and spinflip scattering.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Claude Dimo, Alexandre Faribault
Summary: Recent research has shown that the XX central spin model is integrable when a magnetic field perpendicular to the coupling plane is present. A large number of its eigenstates exhibit no correlation between the central spin and the spins it is coupled to. In this study, we have demonstrated that the integrability of the XX-central spin model remains even in the presence of a magnetic field oriented arbitrarily. Additionally, we have shown that dark states can still be found in the presence of an in-plane magnetic field if the coupling is strong enough. Finally, we have provided a simple explanation for this result and demonstrated its universality for various distributions of the coupling.
Article
Physics, Fluids & Plasmas
Felix Ivander, Nicholas Anto-Sztrikacs, Dvira Segal
Summary: This study investigates the performance of three-level quantum absorption refrigerators and the impact of strong couplings between the working system and thermal baths. It reveals that strong coupling can reshape the cooling window and allow for direct transport pathways between thermal reservoirs. The study emphasizes the need for a comprehensive approach to uncover the reshaping of the operational window, rather than relying on single parameters in limited domains.
Article
Materials Science, Multidisciplinary
Riku Masui, Keisuke Totsuka
Summary: In this study, a higher-spin (S >= 1) generalization of the one-dimensional Kondo-Heisenberg model was investigated using analytical and numerical methods. It was found that different phases, including insulating, ferromagnetic metallic, and dimerized insulating phases, appear under different fillings.
Article
Materials Science, Multidisciplinary
K. Samokhin
Summary: The Zeeman coupling of band electrons with an external magnetic field in some trigonal and hexagonal crystals is strongly anisotropic and necessarily vanishes along the main symmetry axis. This results in qualitative changes in the temperature dependence of electron spin susceptibility in the superconducting state, particularly modifying the power-law exponents at low temperatures due to the contribution of nodal quasiparticles compared to textbook values.
Article
Physics, Fluids & Plasmas
Takuya Saito
Summary: This article investigates modifications of a stochastic polymer model through a shift in the boundary between the system and an external environment. Only the tagged monomer exhibits stochastic motion in the presence of colored noise due to the boundary shift decided by the observer. The Langevin dynamics analysis interprets the colored noise as the emergence of the polymeric elastic force, resulting in additional heat in the observation of the tagged monomer. The projection of comparable internal degrees of freedom is also discussed in relation to the fluctuation theorem and stochastic polymer thermodynamics.
Article
Physics, Applied
Camille L. Latune, Graeme Pleasance, Francesco Petruccione
Summary: While strong system-bath coupling typically results in negative effects in quantum thermal engines, our study shows that a quantum Otto cycle can perform better at strong (but not ultrastrong) coupling, maximizing the product of efficiency and output power. Strong coupling allows for engines with higher efficiency or higher power compared to weakly coupled counterparts. This study emphasizes the importance of studying quantum thermal engines beyond standard configurations.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Fluids & Plasmas
Riekshika Sanwari, Anurag Sahay
Summary: State space Riemannian geometry is studied for the one-dimensional Blume-Emery-Griffiths model and its limits. Two codimension one geometries are obtained and shown to be consistent with thermodynamic scalar curvature. Good agreement is found between these geometries and the correlation lengths for spin and quadrupolar order parameters.
Article
Chemistry, Multidisciplinary
Bo Gao, Song Xu, Qun Xu
Summary: In this study, 2D BTO-CFO nanocomposites with strong magnetoelectric coupling were synthesized using supercritical CO2 method. The biaxial strain effect significantly improved the ferroelectricity and ferrimagnetism of the materials.
Article
Optics
Wei Xiong, Mingfeng Wang, Guo-Qiang Zhang, Jiaojiao Chen
Summary: We propose an approach to realize strong spin-magnon coupling in a hybrid optomechanical cavity-spin-magnon system. By eliminating the mechanical mode, position-position coupling and two-mode squeezing of two cavities are induced. In the squeezing representation, the coupling strengths of spin-photon, magnon-photon, and photon-photon are exponentially amplified, allowing for the generation of lower- and upper-branch polaritons (LBP and UBP) by strongly coupled squeezed modes of two cavities. Utilizing the critical property of LBP, the coupling between the spin qubit (magnon) and LBP is greatly enhanced, while the coupling between the spin qubit (magnon) and UBP is fully suppressed. In the dispersive regime, strong and tunable spin-magnon coupling is induced by the virtual LBP, enabling quantum state exchange between them. Our proposal provides a promising platform to construct magnon-based hybrid systems and realize solid-state quantum information processing with optomechanical interfaces.
Article
Materials Science, Multidisciplinary
Wei Xiong, Miao Tian, Guo-Qiang Zhang, J. Q. You
Summary: This study proposes a scheme to achieve strong coupling between distant spins through the Kerr effect of magnons. By applying a microwave field, the Kerr effect of magnons can induce magnon squeezing, enhancing the coupling between spins and squeezed magnons. This approach allows for an increase in spin-magnon distance and enables remote quantum-state transfer and high-fidelity nonlocal two-qubit gates to be implemented.
Article
Chemistry, Multidisciplinary
Peter E. Siegfried, Hari Bhandari, Jeanie Qi, Rojila Ghimire, Jayadeep Joshi, Zachary T. Messegee, Willie B. Beeson, Kai Liu, Madhav Prasad Ghimire, Yanliu Dang, Huairuo Zhang, Albert V. Davydov, Xiaoyan Tan, Patrick M. Vora, Igor I. Mazin, Nirmal J. Ghimire
Summary: By utilizing ab initio calculations and measurements of magnetic, thermal, and transport properties, it is demonstrated that orthorhombic CoTe2 is near ferromagnetism, which is suppressed by spin fluctuations. Calculations and transport measurements reveal the presence of nodal Dirac lines, making it a rare combination of proximity to quantum criticality and Dirac topology.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Ranjana R. Das, R. Neenu Lekshmi, P. N. Santhosh
Summary: The study reports strong spin-phonon coupling and a large dielectric constant in SrLaCo0.5Mn0.5O4 compound.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Cecile X. Yu, Simon Zihlmann, Jose C. Abadillo-Uriel, Vincent P. Michal, Nils Rambal, Heimanu Niebojewski, Thomas Bedecarrats, Maud Vinet, Etienne Dumur, Michele Filippone, Benoit Bertrand, Silvano De Franceschi, Yann-Michel Niquet, Romain Maurand
Summary: Strong intrinsic spin-orbit interaction in silicon enables strong spin-photon coupling with a frequency of 300 MHz, which is promising for scalable quantum information processing. Coupling semiconductor quantum dots to superconducting microwave resonators allows for fast non-demolition readout and on-chip connectivity. By leveraging the strong spin-orbit interaction in silicon, a spin-photon coupling rate of 330 MHz is achieved, surpassing the spin-photon decoherence rate and paving the way for circuit quantum electrodynamics with spins in semiconductor quantum dots.
NATURE NANOTECHNOLOGY
(2023)
Letter
Multidisciplinary Sciences
Xiaoyu Deng, Katharina M. Stadler, Kristjan Haule, Seung-Sup B. Lee, Andreas Weichselbaum, Jan von Delft, Gabriel Kotliar
NATURE COMMUNICATIONS
(2021)
Correction
Physics, Multidisciplinary
E. Walter, K. M. Stadler, S. -S. b. Lee, Y. Wang, G. Kotliar, A. Weichselbaum, J. von Delft
Article
Physics, Multidisciplinary
Y. Shen, J. Sears, G. Fabbris, A. Weichselbaum, W. Yin, H. Zhao, D. G. Mazzone, H. Miao, M. H. Upton, D. Casa, R. Acevedo-Esteves, C. Nelson, A. M. Barbour, C. Mazzoli, G. Cao, M. P. M. Dean
Summary: In this study, we used resonant x-ray scattering to investigate Ba4Ir3O10 and found the existence of a one-dimensional spinon continuum. Magnetic order appeared when an equivalent amount of strontium was doped and exact diagonalization calculations confirmed that the frustrated intratrimer interactions effectively reduced the system into decoupled spin chains.
PHYSICAL REVIEW LETTERS
(2022)
Correction
Multidisciplinary Sciences
Xiaoyu Deng, Katharina M. M. Stadler, Kristjan Haule, Seung-Sup B. Lee, Andreas Weichselbaum, Jan von Delft, Gabriel Kotliar
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Bin-Bin Chen, Ziyu Chen, Shou-Shu Gong, D. N. Sheng, Wei Li, Andreas Weichselbaum
Summary: In this study, the triangular-lattice Hubbard model is investigated using density matrix renormalization group, and a gapped quantum spin liquid state with long-range spin scalar-chiral correlation is discovered, revealing the spontaneous breaking of time-reversal symmetry.
Article
Materials Science, Multidisciplinary
Anand Manaparambil, Andreas Weichselbaum, Jan von Delft, Ireneusz Weymann
Summary: In this work, we analyze the nonequilibrium transport through a quantum impurity connected to ferromagnetic leads. We investigate the bias dependence of the differential conductance, and observe a finite zero-bias peak characteristic of Kondo resonance. We find that the resonance decreases with increasing the lead spin polarization, which can be restored by applying a finite external magnetic field. Finally, we study the influence of temperature on the nonequilibrium conductance, focusing on split Kondo resonance.
Article
Materials Science, Multidisciplinary
Ji-Yao Chen, Jheng-Wei Li, Pierre Nataf, Sylvain Capponi, Matthieu Mambrini, Keisuke Totsuka, Hong-Hao Tu, Andreas Weichselbaum, Jan von Delft, Didier Poilblanc
Summary: In the physics of the fractional quantum Hall effect, a method is proposed to search for topological SU(N)1 chiral spin liquids in spin systems, with unambiguous signatures of the SU(N)1 character of the chiral liquids obtained through various numerical methods. (Note: the summary is based on the provided translation and might not cover all details from the original text.)
Article
Materials Science, Multidisciplinary
Cole Miles, Matthew R. Carbone, Erica J. Sturm, Deyu Lu, Andreas Weichselbaum, Kipton Barros, Robert M. Konik
Summary: Variational autoencoders are used to extract physical insight from a dataset of spectral functions of the Anderson impurity model. The learned latent variables strongly correlate with key parameters in the model, such as particle-hole asymmetry and Kondo temperature. Using symbolic regression, one of the variables can be modeled as a function of known physical input parameters, rediscovering the nonperturbative formula for the Kondo temperature.
Article
Materials Science, Multidisciplinary
K. M. Stadler, G. Kotliar, S-S B. Lee, A. Weichselbaum, J. von Delft
Summary: In this study, the interaction between Hund physics and Mott physics in the Hubbard-Hund model is investigated, with numerous fingerprints identified in the temperature dependence of various physical quantities to distinguish Hundness from Mottness. The behavior of these quantities within the context of a simple model Hamiltonian can help in experimental and theoretical studies of distinguishing Hundness from Mottness in real materials.
Article
Materials Science, Multidisciplinary
Erica J. Sturm, Matthew R. Carbone, Deyu Lu, Andreas Weichselbaum, Robert M. Konik
Summary: The study shows that neural network models can accurately predict the spectral function of the Anderson Impurity Model, outperforming models based on kernel ridge regression. Trained models demonstrate a significant speedup and the size of the training set can be greatly reduced through specific sampling methods.
Article
Materials Science, Multidisciplinary
Andreas Weichselbaum, Weiguo Yin, Alexei M. Tsvelik
Summary: The study focuses on the antiferromagnetic spin-half Heisenberg ladder with an additional frustrating rung spin,investigating the impact on the phase diagram and discovering a gapped dimerized phase in the regime of strong rung coupling. In the weak rung-coupling regime, the system remains uniform yet exhibits a gapped spinon continuum together with a sharp coherent low-energy branch, making the system critical overall.
Article
Materials Science, Multidisciplinary
Jheng-Wei Li, Benedikt Bruognolo, Andreas Weichselbaum, Jan von Delft
Summary: Through studying the two-dimensional t-J model on a square lattice, we find that at low doping, different orders will interact or compete with each other, and spin symmetry will affect the behavior of the system, including the relationship between stripe order and antiferromagnetic order.
Article
Materials Science, Multidisciplinary
Bin-Bin Chen, Chuang Chen, Ziyu Chen, Jian Cui, Yueyang Zhai, Andreas Weichselbaum, Jan von Delft, Zi Yang Meng, Wei Li
Summary: The study demonstrates that the exponential tensor renormalization group algorithm, complemented by independent determinant quantum Monte Carlo, provides precise finite-temperature quantum many-body state results for correlated electrons, allowing direct comparison with experiments.
Article
Materials Science, Multidisciplinary
Eric C. Andrade, Lukas Janssen, Matthias Vojta
Article
Materials Science, Multidisciplinary
Santanu Dey, Eric C. Andrade, Matthias Vojta