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An importance sampling scheme for models in a strong external field

Mehdi Molkaraie
2015 2015 IEEE International Symposium on Information Theory (ISIT)  
The proposed methods can efficiently compute an estimate of the partition function in a wide range of model parameters. As an example, we consider models that are in a strong external field.  ...  We propose Monte Carlo methods to estimate the partition function of the two-dimensional Ising model in the presence of an external magnetic field.  ...  If the model is in a relatively strong external field, we can consider applying annealed importance sampling [15] ; see Appendix II.  ... 
doi:10.1109/isit.2015.7282641 dblp:conf/isit/Molkaraie15 fatcat:isxg5mh5yfd6xm27sp3uborzei

An Importance Sampling Scheme on Dual Factor Graphs. I. Models in a Strong External Field [article]

Mehdi Molkaraie
2015 arXiv   pre-print
In particular, we consider models that are in a strong external magnetic field.  ...  We propose an importance sampling scheme to estimate the partition function of the two-dimensional ferromagnetic Ising model and the two-dimensional ferromagnetic q-state Potts model, both in the presence  ...  ACKNOWLEDGEMENTS The author would like to thank Hans-Andrea Loeliger, Pascal Vontobel, and Justin Dauwels for their comments that greatly improved the presentation of this paper.  ... 
arXiv:1401.4912v5 fatcat:aqzbnyb22rg4zbofj2pbfjmumi

Angular Dependences of ESR Parameters in Antiferroquadrupolar Phase of CeB6

A.V. Semeno, M.I. Gilmanov, N.E. Sluchanko, V.N. Krasnorussky, N.Y. Shitsevalova, V.B. Filipov, K. Flachbart, S.V. Demishev
2017 Acta Physica Polonica. A  
The data were obtained in two experimental geometries with different mutual directions of the wavevector k and the external magnetic field H at frequency of f = 60 GHz.  ...  This result together with the strong linewidth anisotropy ∆H(Θ) demonstrates that for the relevant description of experimental data the theoretical model should take into account also the interaction of  ...  by the project RFBR 14-02-00800 as well as by programs of the Russian Academy of Sciences "Electron spin resonance, spin-dependent electronic effects and spin technologies" and "Electron correlations in  ... 
doi:10.12693/aphyspola.131.1060 fatcat:37n5ndzjmbchvhxm6i4usnwhke

Monte Carlo Methods for the Ferromagnetic Potts Model Using Factor Graph Duality [article]

Mehdi Molkaraie, Vicenc Gomez
2018 arXiv   pre-print
For the ferromagnetic Ising model in an external field, we show the equivalence between the valid configurations in the dual normal factor graph and the terms that appear in the high-temperature series  ...  Normal factor graph duality offers new possibilities for Monte Carlo algorithms in graphical models.  ...  The authors would like to thank David Forney, Pascal Vontobel, Justin Dauwels, Alistair Sinclair, and Stefan Moser for their helpful comments on an earlier draft of this manuscript.  ... 
arXiv:1506.07044v4 fatcat:frz3gwzvwnbwpmpg6rvevyi6wy

Monte Carlo Methods for the Ferromagnetic Potts Model Using Factor Graph Duality

Mehdi Molkaraie, Vicenc Gomez
2018 IEEE Transactions on Information Theory  
For the ferromagnetic Ising model in an external field, we show the equivalence between the valid configurations in the dual normal factor graph and the terms that appear in the high-temperature series  ...  Normal factor graph duality offers new possibilities for Monte Carlo algorithms in graphical models.  ...  The authors would like to thank David Forney, Pascal Vontobel, Justin Dauwels, Alistair Sinclair, and Stefan Moser for their helpful comments on an earlier draft of this manuscript.  ... 
doi:10.1109/tit.2018.2857565 fatcat:iglrt57st5at3fha5aux62b64e

Proposal for a Sensitive Search for the Electric Dipole Moment of the Electron with Matrix-Isolated Radicals

M. G. Kozlov, Andrei Derevianko
2006 Physical Review Letters  
As was suggested by Shapiro in 1968, the eEDM leads to a magnetization of a sample in the external electric field.  ...  In a typical condensed matter experiment, the effective field on the unpaired electron is of the same order of magnitude as the laboratory field, typically about 10^5V/cm.  ...  An important parameter entering µ CP mol is the degree of molecular polarization n z in the external E-field.  ... 
doi:10.1103/physrevlett.97.063001 pmid:17026169 fatcat:z54agmqvirh3rcl33lkf47hpcm

Unifying All Blazars [article]

G. Fossati International School for Advanced Studies, SISSA/ISAS, Trieste, Italy; now at Center for Astrophysics, Space Sciences
1998 arXiv   pre-print
We propose a new physical model for the unification of all Blazars.  ...  The blazar phenomenology can be accounted for by a sequence in the source power and intensity of the diffuse radiation field surrounding the relativistic jet.  ...  in the properties of HBL, LBL and FSRQ with increasing importance of an external radiation field.  ... 
arXiv:astro-ph/9812158v1 fatcat:vlqplxd5frcffomhccgpgthzmy

Superconducting qubits coupled to torsional resonators

Myung-Joong Hwang, Jae-Hyuk Choi, Mahn-Soo Choi
2010 Journal of Physics: Condensed Matter  
We propose a scheme of strong and tunable coupling between a superconducting phase qubit and nanomechanical torsional resonator.  ...  We analyze the quantum correlation effects in the torsional resonator as a result of the strong coupling to the phase qubit.  ...  In our scheme, linear and quadratic coupling can be selectable simply by changing the direction of an external magnetic field.  ... 
doi:10.1088/0953-8984/22/35/355301 pmid:21403280 fatcat:v3a4omjkjrfgrbrqlszjg4ok6a

Modeling of quantum point contacts in high magnetic fields and with current bias outside the linear response regime

S. Arslan, E. Cicek, D. Eksi, S. Aktas, A. Weichselbaum, A. Siddiki
2008 Physical Review B  
A three dimensional Poisson equation is solved self-consistently to obtain the electron density and potential profile in the absence of an external magnetic field for gate and etching defined devices.  ...  In the presence of an external magnetic field, we investigate the formation of the incompressible strips and their influence on the current distribution both in the linear response and out of linear response  ...  It is important to recall that, in the absence of an external B field, the DOS of a 2DES is just a constant D 0 ͑=m ‫ء‬ / ប 2 = 2.83 ϫ 10 10 meV −1 cm −2 for GaAs͒, which is set by the sample properties  ... 
doi:10.1103/physrevb.78.125423 fatcat:sqhugelhqbhb7lh5e53msd2wta

Comparison of kriging interpolation precision between grid sampling scheme and simple random sampling scheme for precision agriculture

Jiang Houlong, Wang Daibin, Xu Chen, Liu Shuduan, Wang Hongfeng, Yang Chao, Li Najia, Chen Yiyin, Geng Lina
2016 Eurasian Journal of Soil Science  
Considering our data on interpolation precision and the importance of minerals for cultivation of flue-cured tobacco, the grid-sampling scheme should be used in tobacco-planted fields to determine the  ...  The grid-sampling method can be applied in a practical and cost-effective manner to facilitate soil sampling in tobacco-planted field.  ...  A grid pattern is commonly an optimum sampling scheme to ensure that an entire field is represented.  ... 
doi:10.18393/ejss.2016.1.062-073 fatcat:5v2pb3tvjvcdnpkg5gbsz2o56y

A Novel Optimization Method for Conventional Primary and Secondary School Classrooms in Southern China Considering Energy Demand, Thermal Comfort and Daylighting

Yizhe Xu, Chengchu Yan, Hao Qian, Liang Sun, Gang Wang, Yanlong Jiang
2021 Sustainability  
Second, sensitivity analysis is carried out for each optimization variable, and the physical model is modified according to the results to regenerate the sample space.  ...  This paper presents a multi-objective optimization method based on an artificial neural network (ANN) model, which can help designers efficiently optimize the design of primary and secondary school classrooms  ...  Sensitivity Analysis and Modified Physical Model After obtaining the sample space, sensitivity analysis is performed on the model, playing an important role in performance analysis, such as building energy  ... 
doi:10.3390/su132313119 fatcat:tccqnyth35fihp2mv6wp3mtmhy

In-depth Analysis of Front Surface Passivation Properties for N-type IBC Silicon Solar Cells Using Advanced Simulation

C. Gong, K. Van Wichelen, E. Cornagliotti, N.E. Posthuma, J. Poortmans, R. Mertens
2011 Energy Procedia  
To create a better understanding of passivation properties and find the most important issues when developing passivation schemes for various injection conditions, an advanced simulation model is needed  ...  The software package Sentaurus TCAD is applied in this work.  ...  To have a better understanding of passivation properties and find the most important issues when developing passivation schemes for various injection conditions, an advanced simulation model is needed.  ... 
doi:10.1016/j.egypro.2011.06.115 fatcat:liallcuu4na23btdz7642qiaq4

Angular characterization of spin-orbit torque and thermoelectric effects [article]

Huanglin Yang, Huanjian Chen, Meng Tang, Shuai Hu, Xuepeng Qiu
2019 arXiv   pre-print
The superiority of this angular characterization has been further demonstrated in a Cu/CoTb/Cu sample with large ANE but negligible SOT, and in a Pt/Co-Ni sample with weak perpendicular magnetic anisotropy  ...  By providing a comprehensive and versatile way to characterize SOT and thermoelectric effects in diverse heterostructures, our results pave the important foundation for the spin-orbitronic study as well  ...  In the transverse scheme, the magnetization of the sample is rotated in the yz plane with a constant external magnetic field −−→ H ext , as shown in Fig. 2(a, b) .  ... 
arXiv:1909.09012v2 fatcat:drbx4jt3vjds5gfi2yrw7oqtnq

Magnetic field-dependent low-energy magnon dynamics in α–RuCl3

Ilkem Ozge Ozel, Carina A. Belvin, Edoardo Baldini, Itamar Kimchi, Seunghwan Do, Kwang-Yong Choi, Nuh Gedik
2019 Physical review B  
Such an anisotropic exchange interaction that manifests itself as a result of strong spin-orbit coupling can naturally account for the observed mixing of the modes at higher fields strengths.  ...  We investigate the low-energy magnons in α-RuCl_3 by combining time-domain terahertz spectroscopy under an external magnetic field and model Hamiltonian calculations.  ...  field of the relevant lowest two magnon branches in α-RuCl3 at the zone center for Hext b using an (a) and (b) HK model, (c) and (d) HKΓ model with K > 0, and (e) and (f) HKΓ model with K < 0.  ... 
doi:10.1103/physrevb.100.085108 fatcat:cjnhsxij6nflzekgexuutt4phi

Distribution of an Ohmic current in the close vicinity of a quantum point contact

A Siddiki
2008 Journal of Physics, Conference Series  
In the presence of an external current, we show that this current is confined into the incompressible regions where the drift velocity is finite.  ...  Our approach is to solve the Poisson and the Schroedinger equations self-consistently, taking into account electron interactions, within a Hartree type approximation for a two dimensional electron gas  ...  Gerhardts for his initiation, supervision and contribution in developing the model, S. Arslan and A. Weichselbaum in providing the data concerning the solution of the 3D Poisson equation and D.  ... 
doi:10.1088/1742-6596/99/1/012020 fatcat:z44kkyfdbzgvngtfjqm4jeljla
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