My research
More is different.
OPEN SOFTWARE
Toolkit of Bayesian Scaling Analysis
Reference application software of a new scaling analysis method of critical phenomena based on Bayesian inference.
To demo To detailsRESEARCH ACTIVITY
 ResearcherID: D51922014
 Google Scholar Citations
 Acitivity Database on Education and Research, Kyoto University
Preprints arXiv.org
 Kenji Harada: Universal spectrum structure at nonequilibrium critical points in the (1+1)dimensional directed percolation, arXiv:2008.10807.
Papers
You can download all preprints from this link. Also, all PDF files of my papers can be downloaded from Kyoto University Research Information Repository (KURENAI) as this link.
 Ryosuke Yoneda and Kenji Harada: Neural Network Approach to Scaling Analysis of Critical Phenomena, Physical Review E 107,(2023) 044128. 10.1103/PhysRevE.107.044128.
 Chisa Hotta, Tempei Yoshida, and Kenji Harada: Quantum critical dynamics in the twodimensional transverse Ising model, Physical Review Research 5, (2023) 013186. 10.1103/PhysRevResearch.5.013186.
 Toshiya Hikihara, Hiroshi Ueda, Kouichi Okunishi, Kenji Harada, and Tomotoshi Nishino: Automatic structural optimization of tree tensor networks, Physical Review Research 5, (2023) 013031. 10.1103/PhysRevResearch.5.013031.
 Ryosuke Yoneda, Kenji Harada, Yoshiyuki Y. Yamaguchi:
Critical exponents in coupled phaseoscillator models on smallworld networks,
Physical Review E 102, (2020) 062212.
DOI: 10.1103/PhysRevE.102.062212  Hiroshi Ueda, Kouichi Okunishi, Kenji Harada, Roman Krčmár, Andrej Gendiar, Seiji Yunoki, Tomotoshi Nishino:
Finitem scaling analysis of BerezinskiiKosterlitzThouless phase transitions and entanglement spectrum for
the sixstate clock model,
Physical Review E 101, (2020) 062111.
DOI: 10.1103/PhysRevE.101.062111  Kenji Harada and Naoki Kawashima:
Entropy Governed by the Absorbing State of Directed Percolation,
Physical Review Letters 123 (2019) 090601.
DOI: 10.1103/PhysRevLett.123.090601  Kenji Harada:
Entanglement branching operator,
Physical Review B 97 (2018) 045124.
DOI: 10.1103/PhysRevB.97.045124  Tsuyoshi Okubo, Kenji Harada, Jie Lou, Naoki Kawashima:
SU(N) Heisenberg model with multicolumn representations,
Physical Review B 92 (2015) 134404.
DOI: 10.1103/PhysRevB.92.134404  Kenji Harada:
Kernel method for corrections to scaling,
Physical Review E 92 (2015) 012106.
DOI: 10.1103/PhysRevE.92.012106  Takafumi Suzuki, Kenji Harada, Haruhiko Matsuo, Synge Todo, and Naoki Kawashima:
Thermal phase transition of generalized Heisenberg models for SU(N) spins on square and honeycomb
lattices,
Physical Review B 91 (2015) 094414.
DOI: 10.1103/PhysRevB.91.094414  Kouichi Okunishi and Kenji Harada:
Symmetryprotected topological order and negativesign problem for SO(N) bilinearbiquadratic chains,
Physical Review B 89 (2014) 134422.
DOI: 10.1103/PhysRevB.89.134422  Akiko Masaki, Takafumi Suzuki, Kenji Harada, Synge Todo, and Naoki Kawashima:
Parallelized Quantum Monte Carlo Algorithm with Nonlocal Worm Updates,
Physical Review Letters 112 (2014) 140603.
DOI: 10.1103/PhysRevLett.112.140603  Kenji Harada, Takafumi Suzuki, Tsuyoshi Okubo, Haruhiko Matsuo, Jie Lou, Hiroshi Watanabe, Synge Todo, and
Naoki Kawashima:
Possibility of Deconfined Criticality in SU(N) Heisenberg Models at Small N,
Physical Review B 88 (2013) 220408(R).
DOI: 10.1103/PhysRevB.88.220408  Jie Lou, Takafumi Suzuki, Kenji Harada and Naoki Kawashima: Study of the Shastry Sutherland Model Using Multiscale Entanglement Renormalization Ansatz, arXiv:1212.1999.
 Kenji Harada:
Numerical study of incommensurability of the spiral state on spin1/2 spatially anisotropic triangular
antiferromagnets using entanglement renormalization,
Physical Review B 86 (2012) 184421.
DOI: 10.1103/PhysRevB.86.184421  Kenji Harada:
Bayesian inference in the scaling analysis of critical phenomena,
Physical Review E 84 (2011) 056704.
DOI: 10.1103/PhysRevE.84.056704  Kenji Harada and Yuto Kuge:
Diffusion in the ContinuousImaginaryTime Quantum WorldLine Monte Carlo Simulations with Extended
Ensembles,
Journal of the Physical Society of Japan 77 (2008) 0130011  0130014.
DOI: 10.1143/JPSJ.77.013001  Kenji Harada, Naoki Kawashima and Matthias Troyer:
DimerQuadrupolar Quantum Phase Transition in the
QuasiOneDimensional Heisenberg Model with Biquadratic Interaction,
Journal of the Physical Society of Japan 76 (2007) 0137031  0137034.
DOI: 10.1143/JPSJ.76.013703  (INVITED REVIEW PAPER) Naoki Kawashima and Kenji Harada:
Recent Developments of WorldLine Monte Carlo Methods,
Journal of the Physical Society of Japan 73 (2004) 1379  1414.
DOI: 10.1143/JPSJ.73.1379 (FREE)  Jurij Smakov, Kenji Harada and Naoki Kawashima: Quantum
Monte Carlo algorithm for softcore boson systems, Physical
Review E 68 (2003) 046708.
DOI: 10.1103/PhysRevE.68.046708  Kenji Harada, Naoki Kawashima and Matthias Troyer: Neel and
SpinPeierls Ground States of TwoDimensional SU(N) Quantum
Antiferromagnets, Physical Review Letters 90 (2003) 117203.
DOI: 10.1103/PhysRevLett.90.117203  Kenji Harada and Naoki Kawashima: Coarsegrained
loop algorithms for Monte Carlo simulation of quantum spin
systems, Physical Review E 66 (2002) 056705; ibid.
67 (2003) 039903(E).
DOI: 10.1103/PhysRevE.66.056705  Kenji Harada and Naoki Kawashima: Quadrupolar order in
isotropic Heisenberg models with biquadratic interaction,
Physical Review B 65 (2002) 052403.
DOI: 10.1103/PhysRevB.65.052403  C. Yasuda, S. Todo, K. Harada, N. Kawashima, S. Miyashita and
H. Takayama: Classical correlationlength exponent in the
nonuniversal quantum phase transition of a diluted Heisenberg
antiferromagnet, Physical Review B 63 (2001) 140415(R).
DOI: 10.1103/PhysRevB.63.140415  Kenji Harada and Naoki Kawashima: Loop Algorithm for
Heisenberg Models with Biquadratic Interaction and Phase
Transitions in Two Dimensions, Journal of Physical Society of
Japan 70 (2001) 1316.
DOI: 10.1143/JPSJ.70.13  HePing Ying and Kenji Harada: Shorttime dynamics and
magnetic critical behavior of the twodimensional randbond Potts
model, Physical Review E 62 (2000) 174178.
DOI: 10.1103/PhysRevE.62.174  S. Todo, C. Yasuda, K. Kato, K. Harada, N. Kawashima, S. Miyashita, H. Takayama:
Quantum phase transition of twodimensional diluted Heisenberg antiferromagnet,
Progress of Theoretical Physics Supplement 138 (2000) 507512.
DOI: 10.1143/PTPS.138.507  K. Kato, S. Todo, K. Harada, N. Kawashima, S. Miyashita and
H. Takayama: Quantum phase transition of the randomly diluted
Heisenberg antiferromagnet on a square lattice, Physical Review
Letters 84 (2000) 42044207.
DOI: 10.1103/PhysRevLett.84.4204  S. Todo, K. Kato, H. Takayama, K. Harada, N. Kawashima, S. Miyashita:
Quantum Monte Carlo study of sitediluted Heisenberg antiferromagnet on a square lattice,
International Journal of Modern Physics C 10 (1999) 13991407.
DOI: 10.1142/S0129183199001170  Kenji Harada: Numerical Study of Quantum Spin Models by
Loop Algorithm, Doctoral Thesis, Kyoto University (1998).
DOI: 2433/77874  Kenji Harada and Naoki Kawashima: KosterlitzThouless
transition of quantum XY model in two dimensions, Journal of
Physical Society of Japan 67 (1998) 27682776.
DOI: 10.1143/JPSJ.67.2768  Kenji Harada, Matthias Troyer and Naoki Kawashima: The
TwoDimensional S=1 Quantum Heisenberg Antiferromagnet at
Finite Temperatures, Journal of Physical Society of Japan
67 (1998) 11301133.
DOI: 10.1143/JPSJ.67.1130  Kenji Harada and Naoki Kawashima: Universal jump in
helicity modulus of the twodimensional quantum XY model,
Physical Review B 55 (1997) 11949(R)11952(R).
DOI: 10.1103/PhysRevB.55.R11949
Proceedings
 Kenji Harada,
"Tensor Network Studies of Quantum Frustrated Magnets",
JPS Conf. Proc. 3 , 014031 (2014) [7 pages],
Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013).
DOI: 10.7566/JPSCP.3.014031  Mitsuaki Tsukamoto, Kenji Harada, Naoki Kawashima,
"Quantum Monte Carlo Simulation of S=1/2 Heisenberg model with Four Spin Interaction",
Proceedings of the 25th International Conference on Low Temperature Physics (Amsterdams, The Netherlands, 2008), Journal of Physics: Conference Series 150 (2009), 042218.  Kenji Harada, Naoki Kawashima and Matthias Troyer,
"Phase Diagram of the S=1 Bilinear Biquadratic Model",
Proceedings of The 24th International Conference on Low Temperature Physics(LT24) (Florida, USA, 2005), 850 (2006), 10851086 (The AIP Conference Proceedings Series).  Kenji Harada,
"Quantum Worldline Monte Carlo Method with Nonbinary Loops and Its Application",
Proceedings of The 18th Annual Workshop on Recent Developments of Computer Simulation Studies in Condensed Matter Physics (Athens, USA, 2005), 105 (2006), 1326 (Springer Proceedings in Physics).  Kenji Harada and Naoki Kawashima,
"Quadrupolar order in the quantum XY model with cubic anisotropy",
Order and Disorder in Quantum Spin Systems: Proceedings of the 16th Nishinomiya Yukawa Memorial Symposium and
the Yukawa Institute for Theoretical Physics Workshop on Order, Disorder and Dynamics in Quantum Spin Systems,
Progress of Theoretical Physics Supplement 145 (2002) 194199.
DOI: 10.1143/PTPS.145.194
Talks
 (INVITED TALK)Tensor renormalization group study of the nonequilibrium critical fixed point of the onedimensional contact process, The 15th Asia Pacific Physics Conference (APPC15), August 26, 2022 (Korea, online).

"Universal spectrum structure on the nonequilibrium critical line of the
onedimensional DomanyKinzel cellular automaton",
StatPhys seminar, May 31, 2021 (University of Tokyo, Hongo, Japan). 
(INVITED TALK)"Tensor network technique for stochastic process",
Computational Approaches to Quantum Manybody Problems (CAQMP2019), July 17, 2019 (ISSP, Kashiwa, Japan). 
(INVITED TALK)"Entropy of the (1+1)dimensional directed percolation",
Tensor Network States: Algorithms and Applications (TNSAA) 20182019, Dec. 5, 2018 (RCCS Kobe, Japan). 
(INVITED TALK)"Entanglement branching operator",
Novel Quantum States in Condensed Matter 2017, Nov. 6, 2017 (YITP, Kyoto, Japan). 
(INVITED TALK)"General Entanglement Branching in a Tensor Network",
Fourth Workshop on Tensor Network States: Algorithms and Applications, Dec. 14, 2016 (National Center for Theoretical Sciences, Hsinchu, Taiwan). 
(INVITED TALK)"Branching and tensor network",
International Workshop on Tensor Networks and Quantum ManyBody Problems (TNQMP2016), June 27, 2016(ISSP, Kashiwa, Chiba).  "Quantum Monte Carlo study of Quantum Criticality on SO(N) Bilinearbiquadratic Chains",
International Workshop on New Frontier of Numerical Methods for ManyBody Correlations ― Methodologies and Algorithms for Fermion ManyBody Problems, Feb. 18, 2015 (Hongo Campus, The University of Tokyo) (Japan).  (INVITED TALK)"Quantum Monte Carlo study of Quantum Criticality on SO(N) Bilinear
Biquadratic Chains",
the 9th International Conference on Computational Physics (ICCP9), Jan. 07, 2015 (National University of Singapore) (Singapore).  (INVITED TALK)"MERA tensor network and its application on quantum frustrated
magnets",
10sor network workshop  Field 2x5 joint workshop on new algorithms for quantum manybody problems , Nov. 25, 2014, (Kashiwa Future Center, Kashiwa, Chiba) (Japan).  "Possibility of Deconfined Criticality in SU(N) Heisenberg Models at Small N",
the YITP longterm Workshop "Novel Quantum States in Condensed Matter 2014" (NQS2014), Nov. 17, 2014(YITP, Kyoto university, Kyoto) (Japan).  (INVITED TALK)"Deconfined quantum criticality in SU(N) Heisenberg models: Finite size
scaling analysis based on Bayesian inference",
Taipei Tensor Network Workshop 2013, Dec. 4, 2013 (National Taiwan University, Taipei)(Taiwan).  (INVITED TALK)"Numerical study of quantum frustrated magnets using entanglement
renormalization",
International Workshop on Cooperative Quantum Dynamics and Its Control (CQDC’12), October 30, 2012 (Jeulich super computer center, Jeulich) (Germany).  "Numerical study of incommensurability of the spiral state on spin1/2 spatially anisotropic triangular
antiferromagnets using entanglement renormalization",
Conference on Computational Physics (CCP2012) for Physics, Chemistry, Biology, Engineering and related academic fields and industrial applications, October 15, 2012 (Kobe) (Japan).  (INVITED TALK)"Bayesian Inference in the Scaling Analysis of Critical Phenomena",
International Workshop on Recent Developments of Studies on Phase Transitions 2012, June 19, 2012 (University of Tokyo) (Japan).  "Magnetic Structure of Ground States in Spatially Anisotropic Triangular Antiferromagnets",
the 26th NishinomiyaYukawa Memorial International Workshop "Novel Quantum States in Condensed Matter 2011 (NQS2011)", November 8, 2011 (YITP, Kyoto University) (Japan).  (INVITED TALK)"Entanglement renormalization
on the triangular lattice",
New Development of Numerical Simulations in LowDimensional Quantum Systems: From Density Matrix Renormalization Group to Tensor Network Formulations, Oct. 2010 (YITP, Kyoto University) (Japan).  (INVITED TALK)"Entanglement renormalization
of quantum frustrated magnets",
JapanSwiss Joint Workshop: New Trends in Theory of Correlated Materials, Aug. 2010 (Chiba, Japan).  (INVITED TALK)"Multiscale Entanglement Renormalization on a Triangular Lattice",
Miniworkshop on Tensor Network Based Numerical Methods (Numerical Methods in Strongly Correlated Physics), May 28, 2010 (Nathional Center for Theoretical Sciences, National Tsing Hua University) (Hsinchu, Taiwan).  "Quadrupolar order in the bilinearbiquadratic model",
May 25, 2010 (Academia Sinica) (Taipei, Taiwan).  (INVITED TALK)"Multiscale entanglement
renormalization of the spin1/2 Heisenberg model on a triangular
lattice",
Workshop on Matrix Product State Formulation and Density Matrix Renormalization Group Simulations (MPS and DMRG), August 13, 2009 (Oxford Kobe Institute) (Kobe, Japan).  "Quantum Monte Carlo simulations of quantum S=1 spin models with biquadratic interactions",
Supercomputing in Solid State Physics 2009, February 18, 2009 (ISSP, Univ. of Tokyo) (Kashiwa, Japan). 
"Monte Carlo Study of Quantum Phase Transition in
the QuasiOneDimensional SU(N) model",
Symposium "Topological Aspects of Solid State Physics" (Poster), June 24, 2008 (YITP, Kyoto Univ.). 
"Monte Carlo Study of Quantum Phase Transition in
the QuasiOneDimensional SU(N) model",
The 1st International Conference of the Grand Challenge to NextGeneration Integrated Nanoscience (Poster), June 6, 2008 (ISSP, Univ. of Tokyo) (Kashiwa, Japan). 
"Quantum Phase Transition between Two Ordered Phases with Unrelated Symmetries",
International Workshop and Symposium on Computational Approaches to Quantum Critical Phenomena, August 9, 2006 (ISSP, Univ. of Tokyo) (Kashiwa, Japan). 
"Loop Algorithm with Nonbinary Loops",
International Workshop and Symposium on Computational Approaches to Quantum Critical Phenomena, August 2, 2006 (ISSP, Univ. of Tokyo) (Kashiwa, Japan). 
"Phase Diagram of the S=1 Bilinear Biquadratic Model",
The 24th International Conference on Low Temperature Physics(LT24) (Poster), August 15, 2005 (Florida, USA). 
(INVITED TALK)"Quantum Worldline Monte Carlo Method with NonBinary Loops",
The 18th Annual Workshop on Recent Developments of Computer Simulation Studies in Condensed Matter Physics, March 8, 2005 (Univ. of Georgia) (Athens, USA).