scholarly journals Quantum tricritical point emerging in the spin-boson model with two dissipative spins in staggered biases

2021 ◽  
Vol 103 (20) ◽  
Author(s):  
Yan-Zhi Wang ◽  
Shu He ◽  
Liwei Duan ◽  
Qing-Hu Chen
Keyword(s):  
Tricritical Point ◽  
Boson Model

Quantum Tricritical Point in the Spin-Boson Model with an Ohmic Bath

2007 ◽  
Vol 24 (5) ◽  
pp. 1140-1143 ◽  
Author(s):  
Chen Wen ◽  
Chen Zhi-De
Keyword(s):  
Tricritical Point ◽  
Boson Model

Neutron diffractometry investigation of the tricritical point of KH2 PO4

1981 ◽  
Vol 42 (3) ◽  
pp. 445-458 ◽  
Author(s):  
P. Bastie ◽  
M. Vallade ◽  
C. Vettier ◽  
C.M.E. Zeyen ◽  
H. Meister
Keyword(s):  
Tricritical Point

EXPERIMENTS IN3He-4He LIQUID MIXTURES NEAR THE TRICRITICAL POINT

1980 ◽  
Vol 41 (C7) ◽  
pp. C7-133-C7-136 ◽  
Author(s):  
J. del Cueto ◽  
R. L. Johnson ◽  
T. Rohde ◽  
F. H. Wirth ◽  
E. H. Graf
Keyword(s):  
Tricritical Point ◽  
Liquid Mixtures

Energy Levels and Electromagnetic Transition of 90-94mo Nuclei Using Ibm-1

2020 ◽  
pp. 149-152
Keyword(s):  
Experimental Data ◽  
Transition Probability ◽  
Energy Levels ◽  
Dynamical Symmetry ◽  
Interacting Boson Model ◽  
Excitation Energies ◽  
Electromagnetic Transition ◽  
Boson Model ◽  
Energy States ◽  
Good Agreement

The energy states for the J , b , ɤ bands and electromagnetic transitions B (E2) values for even – even molybdenum 90 – 94 Mo nuclei are calculated in the present work of "the interacting boson model (IBM-1)" . The parameters of the equation of IBM-1 Hamiltonian are determined which yield the best excellent suit the experimental energy states . The positive parity of energy states are obtained by using IBS1. for program for even 90 – 94 Mo isotopes with bosons number 5 , 4 and 5 respectively. The" reduced transition probability B(E2)" of these neuclei are calculated and compared with the experimental data . The ratio of the excitation energies of the 41+ to 21+ states ( R4/2) are also calculated . The calculated and experimental (R4/2) values showed that the 90 – 94 Mo nuclei have the vibrational dynamical symmetry U(5). Good agreement was found from comparison between the calculated energy states and electric quadruple probabilities B(E2) transition of the 90–94Mo isotopes with the experimental data .

Tricritical Point in Explosive Percolation

2012 ◽  
Author(s):  
Nuno A.M. Araujo ◽  
José S. Andrade Jr. ◽  
Robert Ziff ◽  
Hans J. Herrmann
Keyword(s):  
Tricritical Point

Ferroelastic phase transition in univalent mercury halides in vicinity of tricritical point

1992 ◽  
Vol 130 (1) ◽  
pp. 263-283 ◽  
Author(s):  
M. E. Boiko ◽  
Yu. Markov ◽  
V. S. Vikhnin ◽  
A. S. Yurkov ◽  
B. S. Zadokhin
Keyword(s):  
Phase Transition ◽  
Tricritical Point ◽  
Ferroelastic Phase Transition ◽  
Mercury Halides

scholarly journals Role of Single-Particle Energies in Microscopic Interacting Boson Model Double Beta Decay Calculations

Universe ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 66
Author(s):  
Jenni Kotila
Keyword(s):  
Beta Decay ◽  
Single Particle ◽  
Field Potential ◽  
Double Beta Decay ◽  
Interacting Boson Model ◽  
Model Calculations ◽  
Single Particle Level ◽  
Particle Level ◽  
Boson Model

Single-particle level energies form a significant input in nuclear physics calculations where single-particle degrees of freedom are taken into account, including microscopic interacting boson model investigations. The single-particle energies may be treated as input parameters that are fitted to reach an optimal fit to the data. Alternatively, they can be calculated using a mean field potential, or they can be extracted from available experimental data, as is done in the current study. The role of single-particle level energies in the microscopic interacting boson model calculations is discussed with special emphasis on recent double beta decay calculations.

scholarly journals Octupole correlations in light actinides from the interacting boson model based on the Gogny energy density functional

2020 ◽  
Vol 102 (6) ◽  
Author(s):  
K. Nomura ◽  
R. Rodríguez-Guzmán ◽  
Y. M. Humadi ◽  
L. M. Robledo ◽  
J. E. García-Ramos
Keyword(s):  
Energy Density ◽  
Density Functional ◽  
Interacting Boson Model ◽  
Energy Density Functional ◽  
Model Based ◽  
Boson Model

scholarly journals Matrix Product State Simulations of Non-Equilibrium Steady States and Transient Heat Flows in the Two-Bath Spin-Boson Model at Finite Temperatures

Entropy ◽  
2021 ◽  
Vol 23 (1) ◽  
pp. 77
Author(s):  
Angus J. Dunnett ◽  
Alex W. Chin
Keyword(s):  
Finite Temperature ◽  
Open Quantum Systems ◽  
Quantum Systems ◽  
Steady States ◽  
Matrix Product ◽  
Open Quantum ◽  
Matrix Product State ◽  
Wide Range ◽  
Boson Model ◽  
Non Equilibrium

Simulating the non-perturbative and non-Markovian dynamics of open quantum systems is a very challenging many body problem, due to the need to evolve both the system and its environments on an equal footing. Tensor network and matrix product states (MPS) have emerged as powerful tools for open system models, but the numerical resources required to treat finite-temperature environments grow extremely rapidly and limit their applications. In this study we use time-dependent variational evolution of MPS to explore the striking theory of Tamascelli et al. (Phys. Rev. Lett. 2019, 123, 090402.) that shows how finite-temperature open dynamics can be obtained from zero temperature, i.e., pure wave function, simulations. Using this approach, we produce a benchmark dataset for the dynamics of the Ohmic spin-boson model across a wide range of coupling strengths and temperatures, and also present a detailed analysis of the numerical costs of simulating non-equilibrium steady states, such as those emerging from the non-perturbative coupling of a qubit to baths at different temperatures. Despite ever-growing resource requirements, we find that converged non-perturbative results can be obtained, and we discuss a number of recent ideas and numerical techniques that should allow wide application of MPS to complex open quantum systems.

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