AAPPS bulletin

December 2022Vol 32

Research and Review
  • Complex Berry curvature and complex energy band structures in non-Hermitian graphene model

    Chao Wu, Annan Fan & Shi-Dong Liang

    Abstract Non-Hermitian quantum systems exhibit many novel physical properties of quantum states. We consider a non-Hermtian graphene model based on the tight-binding approximation with the coupling of the graphene and the substrate. We analyze the complex energy structure of this model and its exceptional points as well as relevant topological invariants. We give the analytic complex Berry connection and Berry curvature in the Brillouin zone and investigate numerically the relationships between

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  • Ultrasound detection using a thermal-assisted microcavity Raman laser

    Jia-Wei Meng, Pei-Ji Zhang, Shui-Jing Tang & Yun-Feng Xiao

    Abstract Optical microcavities have emerged as promising platforms for ultrasound detection. One of the main tendencies in recent studies is to develop high-Q microresonators for ultrasensitive ultrasound detection, while the nonlinear optical effects become significant but are generally neglected. Here, we propose a thermal-assisted microcavity Raman laser for ultrasound detection. Acoustic waves modulate the resonant frequency of the cavity mode, altering the coupled efficiency of a fixed-wav

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  • Analysis of the X(3960) and related tetraquark molecular states via the QCD sum rules

    Qi Xin, Zhi-Gang Wang & Xiao-Song Yang

    Abstract In this work, we study the \(D\bar{D}\), DD, \(D\bar{D}_s\), \(DD_s\), \(D_s\bar{D}_s\) and \(D_sD_s\) tetraquark molecular states with the \(J^{PC}=0^{++}\) via the QCD sum rules. The prediction \(M_{D_s\bar{D}_s} = 3.98\pm 0.10\, \text {GeV}\) is in very good agreement with the experimental value \(M_{X(3960)} = 3956 \pm 5\pm 10 \,\text {MeV}\) from the LHCb collaboration and supports assigning the X(3960) as the \(D_s^+D_s^-\) molecular state with the \(J^{PC}=0^{++}\). We take acco

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  • Spin-orbital-angular-momentum-coupled quantum gases

    Shi-Guo Peng, Kaijun Jiang, Xiao-Long Chen, Ke-Ji Chen, Peng Zou & Lianyi He

    Abstract We briefly review the recent progress of theories and experiments on spin-orbital-angular-momentum (SOAM)-coupled quantum gases. The coupling between the intrinsic degree of freedom of particles and their external orbital motions widely exists in the universe and leads to a broad variety of fundamental phenomena in both classical physics and quantum mechanics. The recent realization of synthetic SOAM coupling in cold atoms has attracted a great deal of attention and stimulated a large

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  • Status of the high-intensity heavy-ion accelerator facility in China

    Xiaohong Zhou, Jiancheng Yang & the HIAF project team

    Abstract Nuclear physics has been aiming at understanding of the origin, structure, and property of strongly interacting matters, which constitute nearly all visible matter in the universe. Despite tremendous breakthroughs and achievements over the past century, there still exists overarching questions that animate nuclear physics today and incite constructing next-generation heavy-ion accelerator complexes worldwide. In order to promote the national development of heavy-ion science and technol

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  • Advances of LINAC-based boron neutron capture therapy in Korea

    Young-soon Bae, Dong-Su Kim, Hyo Jung Seo, Je-Un Han, Hyung Jin Yoon, Jung Jin Hwang, Ju Jin Kim, Byung Hyo Woo, Hyo Jin Kim, Yoo Soon Jang, Seok Chang Han, Woong Hee Kim, Do Goo Kang, Hyun Jin Seo, Soo Young Lee, Sang June Jeon, Jungyu Yi, Jeongwoo Lee, Il Hyeok Seo, Se Hyun Kim, Woo Hyoung Kim, Na Hyung Park, Myeng Hyun Lee, Sung June Bae, Seung Hoon Lee, Gyu Ho Cho, Seong Han Kim, Seong Hwan Moon, Min Kyu Lee, Jae Won Choi, Kyu Young Lee, Dong Seok Huh, Dong Woo Kim, Kyung June Min, Hyoung Min Yoon, Hyunhye Kyung, Jieun Yang, Dasom Na, Sangbong Lee, Jaehwan Han, Yongho Kwak, Sei-Young Lee, Joo Young Nam, Byung-Ho Choi, Young-Kwan Moon, Won Do, Mooyoung Yoo & Sun-Sun Park

    Abstract Boron neutron capture therapy (BNCT) has been attracting interest as a new radiation modality for cancer therapy because it can selectively destroy cancer cells while maintaining the healthy state of surrounding normal cells. Many experimental trials have demonstrated significant BNCT treatment efficacy using neutron beams from research reactors. However, nuclear reactor technology cannot be scaled to sites in hospitals delivering patient treatment. Therefore, compact accelerator-based

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  • Manipulation and enhancement of asymmetric steering via down-converted nondegenerate photons

    Tie Wang, Xue Han, Shutian Liu & Hong-Fu Wang

    Abstract We investigate the asymmetric Gaussian steering with the nondegenerate parametric amplifier in a three-mode optomechanical system composed of two optical cavities and a mechanical oscillator. In the presence of the nondegenerate parametric amplifier, we find that the Gaussian steering between the auxiliary cavity and the mechanical resonator without direct interaction is significantly enhanced. By cooling the delocalized Bogoliubov modes over the auxiliary cavity and the mechanical osc

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News and Views
  • Report on the 11th AAPPS Ordinary General Meeting


    The 11th Ordinary General Meeting (OGM) of the Association of Asia Pacific Physical Societies (AAPPS) was held in a hybrid format from 1:04 p.m. to 3:27 p.m. (UTC+9hr) on August 21, 2022. The in-person venue was the physics department’s faculty meeting room at Yonsei University, Seoul, which was connected online via a Zoom session hosted by the Asia Pacific Center for Theoretical Physics (APCTP). The participants were Jun'ichi Yokoyama (president, in person), Hyoung Joon Choi (vice president, i

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  • Report on the 50th to 52nd Council Meetings


    50th AAPPS Council Meeting The 50th Council Meeting of the Association of Asia Pacific Physical Societies (AAPPS) was held in a hybrid format from 10:00 a.m. to 11:34 a.m. (UTC+9hr) on August 21, 2022. The in-person venue was the faculty meeting room in the physics department at Yonsei University, Seoul, which was connected online via a Zoom session hosted by the Asia Pacific Center for Theoretical Physics (APCTP). The participants were Jun'ichi Yokoyama (president, in person), Hyoung Joon Choi

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  • Citation for the 2022 (the 10th) Nishina Asia Award


    Dr. Suvrat Raju Professor, International Centre for Theoretical Sciences, Tata Institute of Fundamental Research, Bangalore, India For his original and influential insights into the resolution of the black hole information paradox and the principle of holography in quantum gravity. The black hole information paradox has been a longstanding problem in quantum gravity since the discovery of Hawking radiation and black hole evaporation in the 1970s. Although some of the important questions regardi

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  • Topological Modes Unshackled

    Guancong Ma

    Topological matters have been a focus of research across many realms of physics, ranging from quantum electronics [1, 2] and photonics [3], to classical systems such as acoustics and mechanics [4]. Such a long-lasting interest owes not only to the physical and mathematical elegance in the theories for topological matters but also to the immense practical possibilities of topological modes. These topological modes are robust against disorders because their existence is protected by the topology

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