Each year, to recognize significant achievements toward progress in physics, the Physical Society of Japan (JPS) selects outstanding papers from among original research articles published in the Journal of the Physical Society of Japan, Progress of Theoretical Physics, Progress of Theoretical and Experimental Physics, and JPS Conference Proceedings.

The selection committee has chosen the following five papers for the 2021 award based on 19 nominations (16 papers) from editors of the two journals and representatives of the 19 divisions of the JPS.

Title of Article | Observation of a Be double-Lambda hypernucleus in the J-PARC E07 experiment |
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Journal | Prog. Theor. Exp. Phys. 2019, 021D02 (2019) |

Authors | H Ekawa, K Agari, J K Ahn, T Akaishi, Y Akazawa, S Ashikaga, B Bassalleck, S Bleser, Y Endo, Y Fujikawa, N Fujioka, M Fujita, R Goto, Y Han, S Hasegawa, T Hashimoto, S H Hayakawa, T Hayakawa, E Hayata, K Hicks, E Hirose, M Hirose, R Honda, K Hoshino, S Hoshino, K Hosomi, S H Hwang, Y Ichikawa, M Ichikawa, M Ieiri, K Imai, K Inaba, Y Ishikawa, A Iskendir, H Ito, K Ito, W S Jung, S Kanatsuki, H Kanauchi, A Kasagi, T Kawai, M H Kim, S H Kim, S Kinbara, R Kiuchi, H Kobayashi, K Kobayashi, T Koike, A Koshikawa, J Y Lee, J W Lee, T L Ma, S Y Matsumoto, M Minakawa, K Miwa, A T Moe, T J Moon, M Moritsu, Y Nagase, Y Nakada, M Nakagawa, D Nakashima, K Nakazawa, T Nanamura, M Naruki, A N L Nyaw, Y Ogura, M Ohashi, K Oue, S Ozawa, J Pochodzalla, S Y Ryu, H Sako, Y Sasaki, S Sato, Y Sato, F Schupp, K Shirotori, M M Soe, M K Soe, J Y Sohn, H Sugimura, K N Suzuki, H Takahashi, T Takahashi, Y Takahashi, T Takeda, H Tamura, K Tanida, A M M Theint, K T Tint, Y Toyama, M Ukai, E Umezaki, T Watabe, K Watanabe, T O Yamamoto, S B Yang, C S Yoon, J Yoshida, M Yoshimoto, D H Zhang, Z Zhang |

Citation |
The lambda particle is the lightest hyperon which contains one strange quark. The interaction between lambda particles is one of the most important inputs for the structure of neutron stars, and it plays a major role in gravitational waves from the merger of neutron stars and in r-process nucleosynthesis. Because the lambda particle is short-lived, studying the structure of double lambda hypernuclei is critical to determining the interaction between two lambda particles. This paper reported on the successful production of a double hypernucleus of |

Title of Article | Superconductivity in Ca_{1-x}La_{x}FeAs_{2}: A Novel 112-Type Iron Pnictide with Arsenic Zigzag Bonds |
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Journal | J. Phys. Soc. Jpn. 82, 123702 (2013) |

Authors | Naoyuki Katayama, Kazutaka Kudo, Seiichiro Onari, Tasuku Mizukami, Kento Sugawara, Yuki Sugiyama, Yutaka Kitahama, Keita Iba, Kazunori Fujimura, Naoki Nishimoto, Minoru Nohara, and Hiroshi Sawa |

Citation |
Following the discovery of iron-pnictide superconductors ( |

Title of Article | Superconductivity of Au-Ge-Yb Approximants with Tsai-type Clusters |
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Journal | J. Phys. Soc. Jpn. 84, 023705 (2015) |

Author | Kazuhiko Deguchi, Mika Nakayama, Shuya Matsukawa, Keiichiro Imura, Katsumasa Tanaka, Tsutomu Ishimasa, and Noriaki K. Sato |

Citation |
The development of new superconductors and the elucidation of their non-trivial superconducting mechanisms have been vigorously studied globally. In particular, the following questions related to this area of research have been posed: "Does superconductivity appear in quasi crystals without crystal translational symmetry?" and "What is the mechanism of superconductivity?" Studies have been conducted to answer these perplexing questions. |

Title of Article | Anomaly Polynomial of General 6D SCFTs |
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Journal | Prog. Theor. Exp. Phys. 2014, 103B07 (2014) |

Authors | Kantaro Ohmori, Hiroyuki Shimizu, Yuji Tachikawa, Kazuya Yonekura |

Citation |
In this study, the authors developed a method to obtain anomaly polynomials systematically in general six-dimensional |

Title of Article | Quantum Thermal Hall Effect in a Time-Reversal-Symmetry-Broken Topological Superconductor in Two Dimensions: Approach from Bulk Calculations |
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Journal | J. Phys. Soc. Jpn. 82, 023602 (2013) |

Authors | Hiroaki Sumiyoshi and Satoshi Fujimoto |

Citation |
This study examined the thermal Hall conductivity (THC) of two-dimensional topological superconductors. The authors derived the formula of THC from the Bogoliubov-de Gennes (BdG) equation and showed that its coefficient is given by half of the Chern number, that is, it is quantized to one-half of that in the quantum Hall system. This half quantization itself was predicted by other authors based on the picture of the Majorana edge state. The present work is original in the derivation from the BdG equation that describes bulk states and in expressing the result using the bulk topological (Chern) number. The formula was derived without limiting the generality and is quite versatile, e.g., it is not restricted to two dimensions. In fact, the formula has been applied to three-dimensional chiral superconductors with a nodal gap [N. Yoshioka et al., J. Phys. Soc. Jpn. 87, 124602 (2018)]. As observed experimentally in a Kitaev magnet \alpha-RuCl3 [Y. Kasahara et al., Nature 559, 227 (2018)], half quantization of THC is currently a hot topic in the field of topological materials, to which this study made a significant contribution. |