scholarly journals Sequential localization of a complex electron fluid

2019 ◽  
Vol 116 (36) ◽  
pp. 17701-17706 ◽  
Author(s):  
Valentina Martelli ◽  
Ang Cai ◽  
Emilian M. Nica ◽  
Mathieu Taupin ◽  
Andrey Prokofiev ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Electron Localization ◽  
Strongly Correlated ◽  
Unified Framework ◽  
Spin Orbital ◽  
Single Degree Of Freedom ◽  
Strongly Correlated Materials ◽  
Multiple Degrees Of Freedom ◽  
Energy Behavior ◽  
Correlated Quantum Systems

Complex and correlated quantum systems with promise for new functionality often involve entwined electronic degrees of freedom. In such materials, highly unusual properties emerge and could be the result of electron localization. Here, a cubic heavy fermion metal governed by spins and orbitals is chosen as a model system for this physics. Its properties are found to originate from surprisingly simple low-energy behavior, with 2 distinct localization transitions driven by a single degree of freedom at a time. This result is unexpected, but we are able to understand it by advancing the notion of sequential destruction of an SU(4) spin–orbital-coupled Kondo entanglement. Our results implicate electron localization as a unified framework for strongly correlated materials and suggest ways to exploit multiple degrees of freedom for quantum engineering.

scholarly journals Symmetric waterbomb origami

2016 ◽  
Vol 472 (2190) ◽  
pp. 20150846 ◽  
Author(s):  
Yan Chen ◽  
Huijuan Feng ◽  
Jiayao Ma ◽  
Rui Peng ◽  
Zhong You
Keyword(s):  
Degrees Of Freedom ◽  
Degree Of Freedom ◽  
Solar Panels ◽  
Deployable Structures ◽  
Single Degree Of Freedom ◽  
Folding Process ◽  
Multiple Degrees Of Freedom ◽  
Single Degree ◽  
Flat Roofs ◽  
Additional Constraints

The traditional waterbomb origami, produced from a pattern consisting of a series of vertices where six creases meet, is one of the most widely used origami patterns. From a rigid origami viewpoint, it generally has multiple degrees of freedom, but when the pattern is folded symmetrically, the mobility reduces to one. This paper presents a thorough kinematic investigation on symmetric folding of the waterbomb pattern. It has been found that the pattern can have two folding paths under certain circumstance. Moreover, the pattern can be used to fold thick panels. Not only do the additional constraints imposed to fold the thick panels lead to single degree of freedom folding, but the folding process is also kinematically equivalent to the origami of zero-thickness sheets. The findings pave the way for the pattern being readily used to fold deployable structures ranging from flat roofs to large solar panels.

3-DOF Outer Rotor Electromagnetic Spherical Actuator

2016 ◽  
Vol 10 (4) ◽  
pp. 591-598 ◽  
Author(s):  
Yusuke Nishiura ◽  
◽  
Katsuhiro Hirata ◽  
Yo Sakaidani ◽  
Keyword(s):  
Genetic Algorithm ◽  
Dynamic Characteristics ◽  
Degrees Of Freedom ◽  
Single Degree Of Freedom ◽  
Torque Density ◽  
Multiple Degrees Of Freedom ◽  
Single Degree ◽  
Outer Rotor ◽  
High Torque ◽  
Spherical Actuator

Conventionally, many single-degree-of-freedom (single-DOF) actuators have been used to realize devices with multiple-degrees-of-freedom (multi-DOF). However, this makes their structures larger, heavier, and more complicated. In order to remove these drawbacks, the development of spherical actuators with multi-DOF is necessary. In this paper, we propose a new 3-DOF outer rotor electromagnetic spherical actuator with high torque density and wide rotation angles. The dynamic characteristics are computed employing 3-D FEM and its effectiveness is verified by carrying out measurements on a prototype. Then, in order to realize further high torque density, the electromagnetic pole arrangement is optimized using Genetic Algorithm (GA) and the effectiveness of the optimized stator poles arrangement is verified.

Charge and orbital ordering in transition metal oxides

2002 ◽  
Vol 12 (9) ◽  
pp. 257-257
Author(s):  
D. Khomskii
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Degrees Of Freedom ◽  
Relative Role ◽  
Strongly Correlated ◽  
Orbital Ordering ◽  
Spin Orbital ◽  
Electron Phonon Interaction ◽  
Frustrated Systems

Transition metal oxides with strongly correlated d-electrons show an astonishing variety of properties. This is largely determined by an interplay of different degrees of freedom: charge, spin, orbital, lattice ones. Often there appear in them various superstructures. In this talk I will consider different types of superstructures in transition metal oxides, especially charge and orbital ordering, willdiscuss the main mechanisms leading to their formation and consider specific examples of superstructures in manganites, cobaltites and in some frustrated systems. Relative role of purely electronic mechanisms and of the electron-phonon interaction will be discussed. In particular, I will show that the elastic interactions can naturally lead to different superstructures, including stripes. Special features of charge and, especially, orbital ordering in frustrated systems, where frustrations may be caused both by the geometric structure of the lattice and by the special features of orbital interactions, will be considered, and it will be shown that the order-from-disorder mechanism can lead to a unique ordered ground state in many of these cases..

scholarly journals Imaging the coherent propagation of collective modes in the excitonic insulator Ta2NiSe5 at room temperature

2021 ◽  
Vol 7 (28) ◽  
pp. eabd6147
Author(s):  
Hope M. Bretscher ◽  
Paolo Andrich ◽  
Yuta Murakami ◽  
Denis Golež ◽  
Benjamin Remez ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Substantial Contribution ◽  
Collective Modes ◽  
Strongly Correlated ◽  
Many Body ◽  
Phonon Modes ◽  
Pump Probe ◽  
Strongly Correlated Materials ◽  
Excitonic Insulator ◽  
Micrometer Scale

Excitonic insulators host a condensate of electron-hole pairs at equilibrium, giving rise to collective many-body effects. Although several materials have emerged as excitonic insulator candidates, evidence of long-range coherence is lacking and the origin of the ordered phase in these systems remains controversial. Here, using ultrafast pump-probe microscopy, we investigate the possible excitonic insulator Ta2NiSe5. Below 328 K, we observe the anomalous micrometer-scale propagation of coherent modes at velocities of ~105 m/s, which we attribute to the hybridization between phonon modes and the phase mode of the condensate. We develop a theoretical framework to support this explanation and propose that electronic interactions provide a substantial contribution to the ordered phase in Ta2NiSe5. These results allow us to understand how the condensate’s collective modes transport energy and interact with other degrees of freedom. Our study provides a unique paradigm for the investigation and manipulation of these properties in strongly correlated materials.

scholarly journals Review on quasi-2D square planar nickelates

CrystEngComm ◽  
2021 ◽  
Author(s):  
Junjie Zhang ◽  
Xutang Tao
Keyword(s):  
Physical Properties ◽  
Degrees Of Freedom ◽  
Insulator Transition ◽  
Strongly Correlated ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Strongly Correlated Materials ◽  
Square Planar ◽  
Magnetic Resistance

In strongly correlated materials, lattice, charge, spin and orbital degrees of freedom interact with each other, leading to emergent physical properties such as superconductivity, colossal magnetic resistance and metal-insulator transition....

scholarly journals Evaluation of Soil–Structure Interaction in Structure Models via Shaking Table Test

2021 ◽  
Vol 13 (9) ◽  
pp. 4995
Author(s):  
Seongnoh Ahn ◽  
Gun Park ◽  
Hyungchul Yoon ◽  
Jae-Hyeok Han ◽  
Jongwon Jung
Keyword(s):  
Numerical Analysis ◽  
Soil Structure ◽  
Degrees Of Freedom ◽  
Degree Of Freedom ◽  
Shaking Table ◽  
Soil Structure Interaction ◽  
Single Degree Of Freedom ◽  
Structure Interaction ◽  
Multiple Degrees Of Freedom ◽  
Single Degree

Modeling the soil–structure interaction (SSI) in seismic design involves the use of soil response curves for single-degree-of-freedom (SDOF) structures; however, real structures have multiple degrees of freedom (MDOF). In this study, shaking-table-derived p-y curves for SDOF and MDOF superstructures were compared using numerical analysis. It was found that an MDOF structure experienced less displacement than an SDOF structure of the same weight, but the effect of increasing the DOF decreased at greater pile depths. Numerical analysis results estimated using the natural periods and mass participation rates of the structures were similar to those of shaking table tests. Abbreviations: finite element: FE; frequency response function: FRF; multiple degrees of freedom: MDOF; single degree of freedom: SDOF; soil–structure interaction: SSI.

Research on Dynamics Simulation of Moving and Stationary Vibration Screen

2013 ◽  
Vol 415 ◽  
pp. 451-456
Author(s):  
Shao Hua Xu ◽  
Wen Cheng Cao ◽  
Li Zeng
Keyword(s):  
Degrees Of Freedom ◽  
Dynamics Simulation ◽  
Simulation Research ◽  
Single Degree Of Freedom ◽  
Multiple Degrees Of Freedom ◽  
Single Degree ◽  
Runge Kutta Method ◽  
Modes Of Vibration ◽  
Stationary Vibration ◽  
Matlab Programming

The vibrating modes of vibration screen box can be divided into single degree of freedom excitation and multiple degrees of freedom excitation. This paper puts forward the conception of multiple degrees of freedom excitation and sets up the dynamic equation of multiple degrees of freedom excitation vibration screen while the characteristics of one freedom vibration screen are summarized. Through the MATLAB programming language, using the four order Runge-Kutta method, we do a dynamics simulation research on an instance for this type of vibration screen, and analyze the characteristics of this type of vibration screen.

scholarly journals Ultrafast evolution and transient phases of a prototype out-of-equilibrium Mott–Hubbard material

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
G. Lantz ◽  
B. Mansart ◽  
D. Grieger ◽  
D. Boschetto ◽  
N. Nilforoushan ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Lattice Distortion ◽  
Metallic Phase ◽  
Optical Manipulation ◽  
Strongly Correlated ◽  
Optical Pulses ◽  
Strongly Correlated Materials ◽  
Thermal Phase ◽  
New States ◽  
Transient Phases

Abstract The study of photoexcited strongly correlated materials is attracting growing interest since their rich phase diagram often translates into an equally rich out-of-equilibrium behaviour. With femtosecond optical pulses, electronic and lattice degrees of freedom can be transiently decoupled, giving the opportunity of stabilizing new states inaccessible by quasi-adiabatic pathways. Here we show that the prototype Mott–Hubbard material V2O3 presents a transient non-thermal phase developing immediately after ultrafast photoexcitation and lasting few picoseconds. For both the insulating and the metallic phase, the formation of the transient configuration is triggered by the excitation of electrons into the bonding a 1g orbital, and is then stabilized by a lattice distortion characterized by a hardening of the A 1g coherent phonon, in stark contrast with the softening observed upon heating. Our results show the importance of selective electron–lattice interplay for the ultrafast control of material parameters, and are relevant for the optical manipulation of strongly correlated systems.

Decoupling Free Vibration System of Bridge Section Model

2011 ◽  
Vol 199-200 ◽  
pp. 891-894
Author(s):  
Ming Jing Zhang ◽  
Da Bo Xin
Keyword(s):  
Free Vibration ◽  
Degrees Of Freedom ◽  
Vibration System ◽  
Single Degree Of Freedom ◽  
Multiple Degrees Of Freedom ◽  
Single Degree ◽  
Data Measurement ◽  
Spring Suspension ◽  
Acquisition Device ◽  
Section Model

In the paper the free vibration system of bridge section model is designed in order to measure the wind-induced effects on the bridge section model in the wind tunnel. In the system the suspension device is constituted with decoupling sliding components and simple spring suspension. Meanwhile, a set of data measurement and acquisition device based on the Labview is provided in the system. The measurement on the wind-induced static force, flutter and vortex-induced vibration of the bridge section model can be conducted at single degree of freedom or multiple degrees of freedom.

scholarly journals Correlation between ground state and orbital anisotropy in heavy fermion materials

2015 ◽  
Vol 112 (8) ◽  
pp. 2384-2388 ◽  
Author(s):  
Thomas Willers ◽  
Fabio Strigari ◽  
Zhiwei Hu ◽  
Violetta Sessi ◽  
Nicholas B. Brookes ◽  
...  
Keyword(s):  
Ground State ◽  
Heavy Fermion ◽  
Degrees Of Freedom ◽  
Great Accuracy ◽  
Wave Functions ◽  
Antiferromagnetic Order ◽  
Strongly Correlated ◽  
Strongly Correlated Materials ◽  
Crystal Electric Field ◽  
Heavy Fermion Materials

The interplay of structural, orbital, charge, and spin degrees of freedom is at the heart of many emergent phenomena, including superconductivity. Unraveling the underlying forces of such novel phases is a great challenge because it not only requires understanding each of these degrees of freedom, it also involves accounting for the interplay between them. Cerium-based heavy fermion compounds are an ideal playground for investigating these interdependencies, and we present evidence for a correlation between orbital anisotropy and the ground states in a representative family of materials. We have measured the 4f crystal-electric field ground-state wave functions of the strongly correlated materials CeRh1−xIrxIn5 with great accuracy using linear polarization-dependent soft X-ray absorption spectroscopy. These measurements show that these wave functions correlate with the ground-state properties of the substitution series, which covers long-range antiferromagnetic order, unconventional superconductivity, and coexistence of these two states.

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