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Multiscale Entanglement Renormalization Ansatz for Kondo Problem [article]

Hiroaki Matsueda
2012 arXiv   pre-print
We derive the multiscale entanglement renormalization ansatz (MERA) for the single impuity Kondo model.  ...  As the latter starts to dominate the electronic state, the Kondo physics emerges. The present result is a simple and beautiful example of a holographic dual of a boundary conformal field theory.  ...  Then, the Kondo temperature T K can be obtained from the MERA network itself without assuming the specific Kondo interaction.  ... 
arXiv:1208.2872v1 fatcat:xq2ixrwm6fc5zi4ov32hnguu6i

Comment on "Low-Temperature Magnetic Properties of the Kondo Lattice Model in One Dimension" [article]

Hiroaki Matsueda
2015 arXiv   pre-print
This is a comment for a paper entitled "Low-Temperature Magnetic Properties of the Kondo Lattice Model in One Dimension" [S.Minami and H.Kawamura, JPSJ84,044702(2015)].  ...  We start with the 1D Kondo-lattice model.  ...  Summarizing, we have examined the detailed band structure of the 1D Kondo lattice model.  ... 
arXiv:1509.06923v1 fatcat:26fulud2xfhhtohtzezzwkrdx4

Competing Kondo Effects in Non-Kramers Doublet Systems

Hiroaki Kusunose
2016 Journal of the Physical Society of Japan  
In non-Kramers Kondo systems with a quadrupolar degrees of freedom, an ordinary magnetic Kondo effect can compete with the quadrupolar Kondo effect.  ...  The quadrupolar Kondo effect can be described by the two-channel Kondo model, which leads to the local non-Fermi-liquid (NFL) ground state, while the magnetic Kondo effect favors the ordinary local Fermi-liquid  ...  This is a heart of the so-called quadrupolar Kondo effect that is described by the two-channel Kondo model.  ... 
doi:10.7566/jpsj.85.064708 fatcat:hg4n3fm7rrhlrnftii46ianoly

Evolution of a Large Fermi Surface in the Kondo Lattice

Junya Otsuki, Hiroaki Kusunose, Yoshio Kuramoto
2009 Physical Review Letters  
Single-particle spectrum of the Kondo lattice model is derived with use of the continuous-time quantum Monte Carlo method, combined with the dynamical mean-field theory.  ...  In the mean-field theory, the collective Kondo effect appears as a phase transition, and it is difficult to reproduce the Kondo crossover at finite temperatures.  ...  In particular, the width of the pseudogap is the order of the Kondo temperature T K $ 0:1.  ... 
doi:10.1103/physrevlett.102.017202 pmid:19257234 fatcat:kgldp7hzsfeurkfurxpcl6tszi

Neuromuscular electrical stimulation is feasible in patients with acute heart failure

Toru Kondo, Sumio Yamada, Daisuke Tanimura, Shingo Kazama, Toshikazu Ishihara, Masafumi Shimojo, Etsuo Iwata, Sayano Kondo, Hiroaki Hiraiwa, Toshiaki Kato, Hiroaki Sano, Yoshifumi Awaji (+2 others)
2019 ESC Heart Failure  
In acute heart failure (AHF), immobilization is caused because of unstable haemodynamics and dyspnoea, leading to protein wasting. Neuromuscular electrical stimulation (NMES) has been reported to preserve muscle mass and improve functional outcomes in chronic disease. NMES may be effective against protein wasting frequently manifested in patients with AHF; however, whether NMES can be implemented safely without any adverse effect on haemodynamics has remained unknown. This study aimed to examine the feasibility of NMES in patients with AHF.
doi:10.1002/ehf2.12504 pmid:31461577 pmcid:PMC6816057 fatcat:f5bs2q42ivclbj5acmduydajay

Ground-State Properties of Extended Two-Channel Kondo Model

Hiroaki Kusunose
1998 Journal of the Physical Society of Japan  
Ground-state properties are examined for an extended two-channel Kondo model where the Hilbert space of the localized states is extended to include a singlet state in addition to the doublet states.  ...  [1] [2] [3] This non-Fermi-liquid behavior can be initiated by several microscopic origins due to, for example, the two-channel quadrupolar Kondo effect, 4) a distribution of Kondo temperatures 5)  ...  The α (3) term associated with the overscreening state becomes most dominant as expected in the conventional two-channel Kondo model.  ... 
doi:10.1143/jpsj.67.61 fatcat:gjbskfxvnndixigf3e2ksxuzza

Mass-Imbalanced Superconductivity in Effective Two-Channel Kondo Lattice

Hiroaki Kusunose
2016 Journal of the Physical Society of Japan  
We propose that mass-imbalanced superconductivity is realized in an effective two-channel Kondo lattice, and its characteristic property appears in electromagnetic responses such as the Meissner effect  ...  Starting from an effective two-channel Kondo lattice model as a low-energy effective theory, and approximating it with two mean-field order parameter components in a self-consistent fashion, it is shown  ...  Based on the effective twochannel Kondo lattice model with two mean-field (MF) variables, we discuss the interplay between the behavior of the Meissner kernel and the ratio of two components.  ... 
doi:10.7566/jpsj.85.113701 fatcat:4izvsrkmovbvfhbkjg7rly2ucq

Invariant Energy Levels and Flat Band Engineering in a Kondo Lattice Model on Geometrically Frustrated Lattices [article]

Masafumi Udagawa, Hiroaki Ishizuka, Yukitoshi Motome
2013 arXiv   pre-print
We show the existence of invariant energy levels in a Kondo lattice model on an isolated complete graph, such as a triangle and a tetrahedron.  ...  Lattices arXiv:1310.4580v1 [cond-mat.str-el] 17 Oct 2013 Masafumi Udagawa ∗ , Hiroaki Ishizuka, and Yukitoshi Motome  ...  KEYWORDS: Geometrical frustration, flat band, Kondo lattice model 1.  ... 
arXiv:1310.4580v1 fatcat:hfewgc7i35fppb4uyjg3qhsovq

Competition between Hund-Rule Coupling and Kondo Effect

Hiroaki Kusunose, Kazumasa Miyake
1997 Journal of the Physical Society of Japan  
We investigate a problem about the competition between the hybridization and the Hund-rule coupling by applying the Wilson numerical renormalization-group method to the extended Kondo model where the impurity  ...  characteristic energy T_K drastically to the lower side and the irrelevant operator, which describes the low energy physics, takes a form of ferromagnetic exchange interaction between the extra spin and the Kondo  ...  and the localized spin S ′ , no matter how small it is, the antiferromagnetic Kondo effect leads to form the another Kondo resonance state against the Hund-rule coupling.  ... 
doi:10.1143/jpsj.66.1180 fatcat:knqs4i2buzdr5bignvsjjsmxuy

Loop liquid in an Ising-spin Kondo lattice model on a kagome lattice

Hiroaki Ishizuka, Yukitoshi Motome
2013 Physical Review B  
Phase diagram of an Ising-spin Kondo lattice model on a kagome lattice is investigated by a Monte Carlo simulation.  ...  We consider a single-band Kondo lattice model on a kagome lattice with localized Ising spin moments.  ...  To summarize, we studied an Ising-spin Kondo lattice model on a kagome lattice with focusing on the emergent magnetic states and their electronic properties.  ... 
doi:10.1103/physrevb.88.081105 fatcat:4zjb5t7blfh7vpoepngpyqr4fq

The Kondo Lattice Model in Infinite Dimensions: I. Formalism

Junya Otsuki, Hiroaki Kusunose, Yoshio Kuramoto
2009 Journal of the Physical Society of Japan  
A Green-function formalism for the Kondo lattice model is presented, which is designed to be combined with the dynamical mean-field theory.  ...  The Kondo lattice is the simplest model to investigate rich consequence of the collective Kondo effect such as heavy electrons, and competition with magnetically ordered states.  ...  This transform enables us to apply the DMFT formalism to the localized model, such as the Kondo lattice and the CS lattice.  ... 
doi:10.1143/jpsj.78.014702 fatcat:352nppds5va4fkndyoqaguyfim

Partial Disorder in an Ising-Spin Kondo Lattice Model on a Triangular Lattice

Hiroaki Ishizuka, Yukitoshi Motome
2012 Physical Review Letters  
Phase diagram of an Ising-spin Kondo lattice model on a triangular lattice near 1/3-filling is investigated by Monte Carlo simulation.  ...  We consider a single-band Kondo lattice model on a triangular lattice with localized Ising spin moments.  ...  Phase diagram of an Ising-spin Kondo lattice model on a triangular lattice near 1/3-filling is investigated by Monte Carlo simulation.  ... 
doi:10.1103/physrevlett.108.257205 pmid:23004651 fatcat:mfvoa5ch4vcjtaxeii4mx2u77y

Non-Kondo Mechanism for Resistivity Minimum in Spin Ice Conduction Systems

Masafumi Udagawa, Hiroaki Ishizuka, Yukitoshi Motome
2012 Physical Review Letters  
This is demonstrated by the cellular dynamical mean-field theory for a spin-ice type Kondo lattice model on a pyrochlore lattice.  ...  We present a mechanism of resistivity minimum in conduction electron systems coupled with localized moments, which is distinguished from the Kondo effect.  ...  A smoking-gun experiment is a photoemission spectroscopy; a Kondo resonance peak, which is naturally expected to develop below T min in the canonical Kondo systems, is absent in our scenario.  ... 
doi:10.1103/physrevlett.108.066406 pmid:22401096 fatcat:tmne23iwbrcvpovqb572srszsy

Precocious Puberty due to an Ectopic Pituitary Gland

Shuji NIIKAWA, Hiroaki NOKURA, Toshiro UNO, Akio OHKUMA, Jun SHINODA, Hiroaki KONDO, Hiromu YAMADA
1988 Neurologia medico-chirurgica  
A 35-month-
doi:10.2176/nmc.28.681 pmid:2462177 fatcat:e2rukzadp5azxnj3fnj3vvputq

Antiferro-quadrupole State of Orbital-Degenerate Kondo Lattice Model withf2Configuration

Hiroaki Onishi, Takashi Hotta
2008 Journal of the Physical Society of Japan  
Since in a cubic structure, Γ_7 has localized nature, while Γ_8 orbitals are rather itinerant, we propose the orbital-degenerate Kondo lattice model for an effective Hamiltonian of PrPb_3.  ...  To clarify a key role of f orbitals in the emergence of antiferro-quadrupole structure in PrPb_3, we investigate the ground-state property of an orbital-degenerate Kondo lattice model by numerical diagonalization  ...  In the second term, J K is the Kondo coupling between Γ 7 spin and Γ 8 electron.  ... 
doi:10.1143/jpsjs.77sa.199 fatcat:swafckkapfbkbijpnxqtxlfg3a
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