Article
Physics, Multidisciplinary
Andre Erpenbeck, Guy Cohen
Summary: Researchers have proposed a method to indirectly demonstrate the existence of Kondo cloud by measuring singlet weights, and discussed the nonequilibrium mechanism in a quantum transport setup. This reveals a distinct nonequilibrium mechanism for generating Kondo-like entanglement compared to its equilibrium counterpart.
Article
Materials Science, Multidisciplinary
Fabian Eickhoff, Frithjof B. Anders
Summary: The paper investigates the emergence and screening of local magnetic moments in solids, focusing on how these moments are screened and the determination of the low-temperature scale. Through numerical analysis and theoretical proof, the study reveals that stable local moments can be screened by three different mechanisms. It also shows the behavior of local moments under different phase transitions and the emergence of additional low-energy scales in certain conditions.
Article
Multidisciplinary Sciences
C. Piquard, P. Glidic, C. Han, A. Aassime, A. Cavanna, U. Gennser, Y. Meir, E. Sela, A. Anthore, F. Pierre
Summary: Researchers use a charge sensor to perform thermodynamic measurements and observe the state of a Kondo impurity and its progressive screening. They establish the universal renormalization flow from a single free spin to a screened singlet and determine the relationship between scaling Kondo temperature and microscopic parameters. This study provides a new method for thermodynamic investigations of exotic quantum states.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Catalin Pascu Moca, Ireneusz Weymann, Miklos Antal Werner, Gergely Zarand
Summary: Magnetic impurities in a metal are screened by the Kondo effect, while in a superconductor they lead to quantum phase transition and subgap states. The Kondo cloud is present in both quantum phases, but complete in the screened phase and only partial in the unscreened phase. The compensation value, related to g factor of impurities, can be monitored experimentally by bias spectroscopy.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Alexei M. Tsvelik, Piers Coleman
Summary: We describe a mechanism of order fractionalization in a two-dimensional Kondo lattice model, where electrons interact with a spin liquid of Majorana fermions described by the Yao-Lee model. When the Kondo coupling exceeds a critical value, the model undergoes a superconducting instability characterized by a spinor order parameter with specific charge and spin. By introducing a gauge string, we show the development of off-diagonal long-range order in the spinorial order, allowing electrons to tunnel coherently through the spin liquid over arbitrary distances.
Article
Astronomy & Astrophysics
Daiki Suenaga, Yasufumi Araki, Kei Suzuki, Shigehiro Yasui
Summary: We propose a new mechanism for heavy-quark spin polarization in quark matter induced by the Kondo effect under an external magnetic field. Through coupling between light quarks and the magnetic field in quark matter, the HQSP is driven by the Kondo effect. The results show a significant increase in HQSP with the appearance of the Kondo effect, which can be tested in future sign-problem-free lattice simulations.
Article
Physics, Multidisciplinary
P. Chalupa, T. Schaefer, M. Reitner, D. Springer, S. Andergassen, A. Toschi
Summary: This study identified the characteristics of local magnetic moment formation and Kondo screening in the frequency structure of generalized charge susceptibility, providing a new criterion to determine the Kondo temperature on the two-particle level. The results represent a significant progress in the general understanding of quantum field theory at the two-particle level and enable tracing the limits of physics captured by perturbative approaches for correlated systems.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
T. B. Mazitov, A. A. Katanin
Summary: This study investigates the formation of local magnetic moments in the strongly correlated Hubbard model using dynamical mean-field theory, linking the temperature dependence of local charge and spin susceptibilities to different stages of local moment formation. The relationship between the Kondo temperature and the fingerprint criterion is discussed, with similarities near the Mott transition and slight discrepancies further away. Additionally, the behavior of eigenvectors/eigenvalues of fermionic frequency-resolved charge susceptibility and divergences of irreducible vertices is considered in relation to the observed features.
Article
Materials Science, Multidisciplinary
Anirban Mukherjee, Abhirup Mukherjee, N. S. Vidhyadhiraja, A. Taraphder, Siddhartha Lal
Summary: This study uses the URG method to analyze the single-channel Kondo model, revealing an increase in entanglement and correlations within the Kondo cloud as the flow progresses. The findings show an increase in entanglement between the impurity and cloud electrons towards the Kondo-singlet ground state, as well as an increase in both number diagonal and off-diagonal correlations within the conduction cloud.
Article
Materials Science, Multidisciplinary
Wuli Miao, Moran Wang
Summary: Understanding the energy exchange between electrons and phonons in metals is crucial for micro- and nanomanufacturing and system design. A proposed e-ph coupling model successfully includes nonequilibrium effects in the calculation of the e-ph coupling constant, showing a significant reduction due to temporal and spatial nonequilibrium. This work not only enhances the fundamental understanding of the e-ph coupling constant but also improves theoretical descriptions of coupled electron and phonon transport at micro- and nanoscale levels.
Article
Chemistry, Multidisciplinary
Cosme G. Ayani, Michele Pisarra, Ivan M. Ibarburu, Manuela Garnica, Rodolfo Miranda, Fabian Calleja, Fernando Martin, Amadeo L. Vazquez de Parga
Summary: This study reports the realization of a 2D Kondo lattice by stacking a single-layer Mott insulator on a metallic surface. The results show that below 27 K, the Kondo screening of localized electrons in the Mott insulator occurs, leading to the formation of a Kondo lattice extended to the entire sample. The electronic properties and temperature dependence of the system are explained using density functional theory.
Article
Multidisciplinary Sciences
Harris Pirie, Eric Mascot, Christian E. Matt, Yu Liu, Pengcheng Chen, M. H. Hamidian, Shanta Saha, Xiangfeng Wang, Johnpierre Paglione, Graeme Luke, David Goldhaber-Gordon, Cyrus F. Hirjibehedin, J. C. Seamus Davis, Dirk K. Morr, Jennifer E. Hoffman
Summary: In this study, we used a scanning tunneling microscope to visualize the real-space charge landscape of a Kondo lattice. We observed nanometer-scale puddles of metallic conduction electrons around uranium-site substitutions in URu2Si2 and around samarium-site defects in SmB6. These defects disrupted the Kondo screening cloud and revealed the metallic parent state. This research suggests that the three-dimensional quantum oscillations observed in SmB6 may arise from Kondo-lattice defects.
Article
Multidisciplinary Sciences
Shiwei Shen, Chenhaoping Wen, Pengfei Kong, Jingjing Gao, Jianguo Si, Xuan Luo, Wenjian Lu, Yuping Sun, Gang Chen, Shichao Yan
Summary: Researchers demonstrate a transition from an insulating gap to a tunable Kondo resonance in 1T-TaS2 by Pb intercalation, providing a pathway for creating and tuning many-body electronic states in layered narrow-electronic-band materials.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Analytical
Ning Liu, Chuangding Li, Gao Wang, Zibin Wu, Deping Li
Summary: In this paper, a local map extraction strategy based on spatiotemporal consistency is proposed to address the problem that Dense Surfel Mapping relies on the input of a common-view relationship. The local map is extracted through the inter-frame pose observability and temporal continuity. A normal constraint is added to the map fusion and weight initialization to reduce the blurring caused by different viewing angles. The parameters of superpixel extraction are dynamically adjusted to achieve continuous and stable time efficiency. Experimental results on the ICL-NUIM and KITTI datasets show an improvement of approximately 27-43% in partial reconstruction accuracy. Furthermore, the system achieves a real-time performance of greater than 15 Hz using only CPU computation, with an improvement of approximately 13%.
Article
Materials Science, Multidisciplinary
Adrian B. Culver, Natan Andrei
Summary: This study presents a method for calculating the time-dependent many-body wavefunction in the non-equilibrium Kondo model, showing applicability beyond using the Bethe ansatz and unveiling a universal regime in the case of strong ferromagnetic coupling. The results reveal a current-carrying non-equilibrium steady state that converges to all orders in the steady-state limit, providing insights into the behavior of the Kondo model in different coupling regimes.
Article
Physics, Multidisciplinary
Sascha Ranftl, Gian Marco Melito, Vahid Badeli, Alice Reinbacher-Koestinger, Katrin Ellermann, Wolfgang von der Linden
Article
Physics, Multidisciplinary
Feng Chen, Enrico Arrigoni, Michael Galperin
NEW JOURNAL OF PHYSICS
(2019)
Article
Physics, Multidisciplinary
Gerhard Dorn, Enrico Arrigoni, Wolfgang von der Linden
Summary: The article introduces a systematic approximation method for evaluating the Born-Markov master equations in open quantum systems for steady state transport studies. The approach formulates the master equation in the eigenbasis of the system, gradually building it by including eigenstates with increasing grandcanonical energies, and introduces quality factors to quantify convergence of the approximate scheme.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2021)
Article
Engineering, Biomedical
Christof Pichler, Sascha Ranftl, Arnulf Heller, Enrico Arrigoni, Wolfgang von der Linden
Summary: This study used Bayesian Probability Theory to decompose EBI signals, aiding physicians in monitoring and improving the estimation and reliability assessment of hemodynamic parameters.
BIOMEDICAL SIGNAL PROCESSING AND CONTROL
(2021)
Article
Materials Science, Multidisciplinary
Santanu Saha, Wolfgang von der Linden, Lilia Boeri
Summary: The search for new superhard materials has been driven by industrial demands for low-cost alternatives to diamond and c-BN, such as metal borides. Fused borophenes (FBs), a new family of superhard materials with 2D boron layers interlinked to form a 3D network, have Vicker's hardness comparable to the best commercial metal borides. Due to their low formation enthalpies, FBs could be synthesized through high-temperature methods or quenching of high-pressure phases.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Physics, Multidisciplinary
Tobias Spindelboeck, Sascha Ranftl, Wolfgang von der Linden
Summary: Aortic dissection, a specific pathology of the aorta, has low incidence but high mortality rates. Early identification and treatment are crucial for patient survival. Using impedance cardiography signals for detection, a trained neural network shows high specificity and sensitivity, with better accuracy for small false lumens.
Article
Engineering, Biomedical
Sascha Ranftl, Thomas Stephan Mueller, Ursula Windberger, Guenter Brenn, Wolfgang von der Linden
Summary: Computational hemodynamics has gained attention recently, but the credibility of patient-specific simulations is often in doubt due to questionable model assumptions. In this study, the impact of blood rheological models on wall shear stress uncertainties in aortic hemodynamics was investigated using Bayesian Probability Theory. The findings indicate that non-Newtonian models provide more realistic uncertainties compared to Newtonian models, and a more precise determination of person-specific blood rheological properties is necessary for accurate person-specific simulations.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Florian Maislinger, Hans Gerd Evertz
Summary: We study the behavior of a Hubbard model under the influence of a short electric field pulse, focusing on phenomena such as multiple photon excitations and changes in double occupancy. The behavior depends on the driving frequency of the electric field. We observe distinct photon excitation peaks in the eigenstate spectrum, and introduce a technique to analyze the time evolution of double occupancy. The long-term behavior of double occupancy is mainly determined by the absorbed energy.
Article
Materials Science, Multidisciplinary
Simone Di Cataldo, Christoph Heil, Wolfgang von der Linden, Lilia Boeri
Summary: In this paper, a new high-Tc hydride superconductor, LaBH8, is computationally predicted to have a Tc of 126 K at a pressure of 50 GPa, making it thermodynamically stable above 100 GPa and dynamically stable down to 40 GPa. LaBH8's unique structure, a ternary sodalite-like hydride, is stabilized by a metallic hydrogen sublattice supported by La-B scaffolding, allowing for a more efficient packing of atoms than in binary sodalite hydrides due to the combination of elements of different sizes.
Article
Materials Science, Multidisciplinary
A. Weh, Y. Zhang, A. Oestlin, H. Terletska, D. Bauernfeind, K-M Tam, H. G. Evertz, K. Byczuk, D. Vollhardt, L. Chioncel
Summary: In order to explore correlated electrons in the presence of local and nonlocal disorder, the study combines the Blackman-Esterling-Berk method for averaging over off-diagonal disorder with dynamical mean-field theory using tensor notation. Through the newly developed fork tensor-product state solver, they were able to solve the impurity model combining disorder and correlations, allowing the calculation of single particle spectral functions on the real-frequency axis. The study also analyzes the transitions from an alloy band insulator through a correlated metal into a Mott insulating phase as the Hubbard U parameter is increased.
Article
Physics, Multidisciplinary
A. Weh, J. Otsuki, H. Schnait, H. G. Evertz, U. Eckern, A. Lichtenstein, L. Chioncel
PHYSICAL REVIEW RESEARCH
(2020)
Article
Physics, Fluids & Plasmas
Max E. Sorantin, Delia M. Fugger, Antonius Dorda, Wolfgang von der Linden, Enrico Arrigoni
Article
Materials Science, Multidisciplinary
Max E. Sorantin, Wolfgang von der Linden, Roman Lucrezi, Enrico Arrigoni
Article
Materials Science, Multidisciplinary
M. Rumetshofer, D. Bauernfeind, E. Arrigoni, W. von der Linden
Article
Materials Science, Multidisciplinary
Irakli Titvinidze, Max E. Sorantin, Antonius Dorda, Wolfgang von der Linden, Enrico Arrigoni