Kaons in dense half-Skyrmion matter

Park, Byung-Yoon; Kim, Joon-Il; Rho, Mannque

doi:10.1103/physrevc.81.035203

Cited by 35 publications

(55 citation statements)

References 40 publications

(60 reference statements)

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“…One is that in the presence of the topology change at n 1/2 , the mass of K − has a propitious drop not present in conventional chiral perturbation treatments [50]. This goes in the direction of lowering the critical density for kaon condensation.…”

Section: Comments and Discussionmentioning

confidence: 99%

Half-Skyrmions and the equation of state for compact-star matter

et al. 2013

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The half-skyrmions that appear in dense baryonic matter when skyrmions are put on crystals modify drastically hadron properties in dense medium and affect strongly the nuclear tensor forces, thereby influencing the equation of state (EoS) of dense nuclear and asymmetric nuclear matter. The matter comprised of half skyrmions has vanishing quark condensate but non-vanishing pion decay constant and could be interpreted as a hadronic dual of strong-coupled quark matter. We infer from this observation combined with certain predictions of hidden local symmetry in low-energy hadronic interactions a set of new scaling laws -called "new-BR" -for the parameters in nuclear effective field theory controlled by renormalization-group flow. They are subjected to the EoS of symmetric and asymmetric nuclear matter, and are then applied to nuclear symmetry energies and properties of compact stars. The changeover from the skyrmion matter to a half-skyrmion matter that takes place after the cross-over density n 1/2 provides a simple and natural field theoretic explanation for the change of the EoS from soft to stiff at a density above that of nuclear matter required for compact stars as massive as ∼ 2.4M⊙. Cross-over density in the range 1.5n0 ∼ < n 1/2 ∼ < 2.0n0 has been employed, and the possible skyrmion half-skyrmion coexistence or cross-over near n 1/2 is discussed. The novel structure of the tensor forces and the EoS obtained with the new-BR scaling is relevant for neutron-rich nuclei and compact star matter and could be studied in RIB (rare isotope beam) machines.

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Section: Comments and Discussionmentioning

confidence: 99%

Half-Skyrmions and the equation of state for compact-star matter

et al. 2013

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“…15 It is more stable than the Sb-interstitial (Sb i ) by about 0.5 eV. V Co is a triple shallow acceptor and is suggested to be the origin of the p-type nature of Sb-rich CoSb 3 .…”

Section: Co-vacancymentioning

confidence: 98%

“…15 The formation energy is only about 0.5 eV. It is more stable than the Sb-vacancy (V Sb ) by as much as 2.0 eV.…”

Section: Co-interstitialmentioning

confidence: 99%

“…V Co is a triple shallow acceptor and is suggested to be the origin of the p-type nature of Sb-rich CoSb 3 . 15 Since Co 3+ and Sb 4 4À are the formal oxidation states in CoSb 3 , the formation of a single V Co leads to a lack of three electrons, which generates three holes in the partially occupied Sb 4 -related valence states.…”

Section: Co-vacancymentioning

confidence: 99%

“…Recently, we reported a density-functional study on the native point defects in off-stoichiometric CoSb 3 , suggesting that the Co-vacancy (V Co ) plays a key role in p-type Sb-rich CoSb 3 and that the Co-interstitial (Co i ) is important to give p-type doping in Co-rich CoSb 3 at high temperature. 15 At low temperature, it was also suggested that the pairing of Co i can lead to n-type doping in Co-rich CoSb 3 .…”

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Atomic and Electronic Structures of Co-Related Point Defects in CoSb3

Park

Kim

2010

Journal of Elec Materi

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Co-vacancies (V Co ) and Co-interstitials (Co i ) have been suggested to play key roles in p-type doping in CoSb 3 under Sb-rich and Co-rich conditions, respectively. Based on density-functional theory calculations, we report detailed atomic and electronic structures of the Co-related point defects in CoSb 3 . The Co-vacancy is found to induce increases in the long and short bond lengths of the nearby Sb 4 rings, generating Sb 4 -p-like acceptor states inside the band gap. Co-interstitial is found to have a sevenfold coordination number in the lowest energy configuration, and gives a single 3d-like acceptor state slightly above the valence-band maximum. The sevenfold Co-interstitials can be paired with an additional Co i -Co i bond, and by the pairing, the 3d-like acceptor state becomes deep inside the band gap, and new donor states are found to emerge inside the band gap.

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Powder X‐Ray Diffraction Pattern Is All You Need for Machine‐Learning‐Based Symmetry Identification and Property Prediction

Lee

Park

et al. 2022

Advanced Intelligent Systems

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Herein, data‐driven symmetry identification, property prediction, and low‐dimensional embedding from powder X‐Ray diffraction (XRD) patterns of inorganic crystal structure database (ICSD) and materials project (MP) entries are reported. For this purpose, a fully convolutional neural network (FCN), transformer encoder (T‐encoder), and variational autoencoder (VAE) are used. The results are compared to those obtained from a well‐established crystal graph convolutional neural network (CGCNN). A task‐specified small dataset that focuses on a narrow material system, knowledge (rule)‐based descriptor extraction, and significant data dimension reduction are not the main focus of this study. Conventional powder XRD patterns, which are most widely used in materials research, can be used as a significantly informative material descriptor for deep learning. Both the FCN and T‐encoder outperform the CGCNN for symmetry classification. For property prediction, the performance of the FCN concatenated with multilayer perceptron reaches the performance level of CGCNN. Machine‐learning‐driven material property prediction from the powder XRD pattern deserves appreciation because no such attempts have been made despite common XRD‐driven symmetry (and lattice size) prediction and phase identification. The ICSD and MP data are embedded in the 2D (or 3D) latent space through the VAE, and well‐separated clustering according to the symmetry and property is observed.

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Kaons in dense half-Skyrmion matter

Cited by 35 publications

References 40 publications

Half-Skyrmions and the equation of state for compact-star matter

Half-Skyrmions and the equation of state for compact-star matter

Atomic and Electronic Structures of Co-Related Point Defects in CoSb3

Powder X‐Ray Diffraction Pattern Is All You Need for Machine‐Learning‐Based Symmetry Identification and Property Prediction

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