Pub Date : 2024-02-12DOI: 10.1088/1572-9494/ad1cde
Chao Wang, Bin Wu, Zhen-Ming Xu, Wen-Li Yang
This paper studies the thermodynamic geometry of the Reissner–Nordström-anti-de Sitter (RN-AdS) black hole via detection of the non-local observables in the dual field theory, including the entanglement entropy and equal-time two-point correlation function. With the dimensional analysis, we construct the principle of corresponding states of black hole thermodynamics. As a result, our findings can be applied to black holes with different AdS backgrounds. In this sense, the probe of the thermodynamic geometry of the RN-AdS black hole though the non-local observables in dual field theory has been confirmed numerically.
{"title":"Thermodynamic geometry of the RN-AdS black hole and non-local observables","authors":"Chao Wang, Bin Wu, Zhen-Ming Xu, Wen-Li Yang","doi":"10.1088/1572-9494/ad1cde","DOIUrl":"https://doi.org/10.1088/1572-9494/ad1cde","url":null,"abstract":"This paper studies the thermodynamic geometry of the Reissner–Nordström-anti-de Sitter (RN-AdS) black hole via detection of the non-local observables in the dual field theory, including the entanglement entropy and equal-time two-point correlation function. With the dimensional analysis, we construct the principle of corresponding states of black hole thermodynamics. As a result, our findings can be applied to black holes with different AdS backgrounds. In this sense, the probe of the thermodynamic geometry of the RN-AdS black hole though the non-local observables in dual field theory has been confirmed numerically.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"4 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139764017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-29DOI: 10.1088/1572-9494/ad1987
Muhammad Yasir, Shahid Chaudhary, Tiecheng Xia
The thermodynamics of black holes has had a profound impact on theoretical physics, providing insights into the nature of gravity, the quantum structure of spacetime, and the fundamental laws governing the universe. In this work, we study thermal geometries and Hawking evaporation of recently proposed topological dyonic dilaton black hole in AdS space. We consider Renyi entropy and obtain the relations for pressure, heat capacity and Gibbs free energy and observe that the Renyi parameter and dilaton ¯eld has vital role on the phase transition and stability of the BH. Moreover, we use Weinhold, Ruppeiner and Hendi Panahiyah Eslam Momennia models to evaluate scalar curvature of the BH and ¯nd out that the divergence points of the scalar curvature coincides with the zero of speci¯c heat. Finally using Stefan-Boltzmann law, we analyze that black hole without dilaton ¯eld evaporate far more quickly as compare to dilaton black hole in AdS space.
{"title":"Consequences of Renyi Entropy on the Thermal Geometries andHawking Evaporation of Topological Dyonic Dilaton Black Hole","authors":"Muhammad Yasir, Shahid Chaudhary, Tiecheng Xia","doi":"10.1088/1572-9494/ad1987","DOIUrl":"https://doi.org/10.1088/1572-9494/ad1987","url":null,"abstract":"The thermodynamics of black holes has had a profound impact on theoretical physics, providing insights into the nature of gravity, the quantum structure of spacetime, and the fundamental laws governing the universe. In this work, we study thermal geometries and Hawking evaporation of recently proposed topological dyonic dilaton black hole in AdS space. We consider Renyi entropy and obtain the relations for pressure, heat capacity and Gibbs free energy and observe that the Renyi parameter and dilaton ¯eld has vital role on the phase transition and stability of the BH. Moreover, we use Weinhold, Ruppeiner and Hendi Panahiyah Eslam Momennia models to evaluate scalar curvature of the BH and ¯nd out that the divergence points of the scalar curvature coincides with the zero of speci¯c heat. Finally using Stefan-Boltzmann law, we analyze that black hole without dilaton ¯eld evaporate far more quickly as compare to dilaton black hole in AdS space.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"58 s201","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139145907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-29DOI: 10.1088/1572-9494/ad1989
Marjan Zakavi, Mohammad sabaeian
In this study, we successfully extracted the "knee structure" for non-sequential double ionization (NSDI) in the helium atom. To achieve this, for the first time, we solved the time-dependent Schrödinger equation in three dimensions for the helium atom, utilizing the shielding charge approximation. Our findings corroborate prior observations by Wang et al. [Wang and Eberly, PRL 105, 083001 (2010)], demonstrating that NSDI occurs within a narrower time window in circular polarization compared to linear polarization. As a result, the yield of linear polarization was higher than that of circular polarization, aligning with the previously reported results. Notably, in the case of circular polarization, the time window further narrows with increasing intensity, attributed to a decrease in the time-of-flight.
在这项研究中，我们成功地提取了氦原子非连续双电离（NSDI）的 "膝部结构"。为此，我们首次利用屏蔽电荷近似，在三维空间中求解了氦原子的时变薛定谔方程。我们的研究结果证实了 Wang 等人之前的观察结果[Wang and Eberly, PRL 105, 083001 (2010)]，证明与线性偏振相比，NSDI 在圆偏振中发生的时间窗口更窄。因此，线偏振的产率高于圆偏振，这与之前报告的结果一致。值得注意的是，在圆极化情况下，时间窗随着强度的增加而进一步缩小，这归因于飞行时间的缩短。
{"title":"The modeling non-sequential double ionization of helium under high-intensity femtosecond laser pulses with shielding charge approximation","authors":"Marjan Zakavi, Mohammad sabaeian","doi":"10.1088/1572-9494/ad1989","DOIUrl":"https://doi.org/10.1088/1572-9494/ad1989","url":null,"abstract":"In this study, we successfully extracted the \"knee structure\" for non-sequential double ionization (NSDI) in the helium atom. To achieve this, for the first time, we solved the time-dependent Schrödinger equation in three dimensions for the helium atom, utilizing the shielding charge approximation. Our findings corroborate prior observations by Wang et al. [Wang and Eberly, PRL 105, 083001 (2010)], demonstrating that NSDI occurs within a narrower time window in circular polarization compared to linear polarization. As a result, the yield of linear polarization was higher than that of circular polarization, aligning with the previously reported results. Notably, in the case of circular polarization, the time window further narrows with increasing intensity, attributed to a decrease in the time-of-flight.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"134 S446","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139146380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-22DOI: 10.1088/1572-9494/ad1824
Zun Wang, Junjie Zhao, Zhoujian Cao
The same to laser interferometer gravitational-wave observatory (LIGO), matched filtering technique will be critical to data analysis of gravitational wave detection by space-based detectors including LISA, Taiji and Tianqin. Waveform templates are basis for such matched filtering technique. In order to construct ready-to-use waveform templates, numerical relativity waveforms are start point. So the accuracy issue of numerical relativity waveforms is critically important. There are many investigations about this issue with respect to LIGO. But unfortunately there are few results on this issue with respect to space-based detectors. The current paper investigates this problem. Our results indicate that the existing numerical relativity waveforms are as accurate as 99% with respect to space-based detectors including LISA, Taiji and Tianqin. Such accuracy level is comparable to the one with respect to LIGO.
{"title":"Accuracy of numerical relativity waveforms with respect to space-based gravitational wave detectors","authors":"Zun Wang, Junjie Zhao, Zhoujian Cao","doi":"10.1088/1572-9494/ad1824","DOIUrl":"https://doi.org/10.1088/1572-9494/ad1824","url":null,"abstract":"The same to laser interferometer gravitational-wave observatory (LIGO), matched filtering technique will be critical to data analysis of gravitational wave detection by space-based detectors including LISA, Taiji and Tianqin. Waveform templates are basis for such matched filtering technique. In order to construct ready-to-use waveform templates, numerical relativity waveforms are start point. So the accuracy issue of numerical relativity waveforms is critically important. There are many investigations about this issue with respect to LIGO. But unfortunately there are few results on this issue with respect to space-based detectors. The current paper investigates this problem. Our results indicate that the existing numerical relativity waveforms are as accurate as 99% with respect to space-based detectors including LISA, Taiji and Tianqin. Such accuracy level is comparable to the one with respect to LIGO.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"30 31","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139166070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-20DOI: 10.1088/1572-9494/ad0e05
Allah Ditta, Xia Tiecheng, Farruh Atamurotov, Ibrar Hussain, G Mustafa
We study the particle dynamics around a black hole (BH) in f(Q) gravity. First, we investigate the influence of the parameters of f(Q) gravity on the horizon structure of the BH, photon orbits and the radius of the innermost stable circular orbit (ISCO) of massive particles. We further study the effects of the parameters of f(Q) gravity on the shadow cast by the BH. Moreover, we consider weak gravitational lensing using the general method, where we also explore the deflection angle of light rays around the BH in f(Q) gravity in uniform and nonuniform plasma mediums.
{"title":"Particle dynamics, black hole shadow and weak gravitational lensing in the f (Q) theory of gravity","authors":"Allah Ditta, Xia Tiecheng, Farruh Atamurotov, Ibrar Hussain, G Mustafa","doi":"10.1088/1572-9494/ad0e05","DOIUrl":"https://doi.org/10.1088/1572-9494/ad0e05","url":null,"abstract":"We study the particle dynamics around a black hole (BH) in <italic toggle=\"yes\">f</italic>(<italic toggle=\"yes\">Q</italic>) gravity. First, we investigate the influence of the parameters of <italic toggle=\"yes\">f</italic>(<italic toggle=\"yes\">Q</italic>) gravity on the horizon structure of the BH, photon orbits and the radius of the innermost stable circular orbit (ISCO) of massive particles. We further study the effects of the parameters of <italic toggle=\"yes\">f</italic>(<italic toggle=\"yes\">Q</italic>) gravity on the shadow cast by the BH. Moreover, we consider weak gravitational lensing using the general method, where we also explore the deflection angle of light rays around the BH in <italic toggle=\"yes\">f</italic>(<italic toggle=\"yes\">Q</italic>) gravity in uniform and nonuniform plasma mediums.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"34 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139055930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-20DOI: 10.1088/1572-9494/ad0f8d
Wen-Liang Li, Hai-Jing Song, Tie-Ling Song, D L Zhou
Motivated by the recent experimental developments in ultracold molecules and atoms, we propose a simple theoretical model to address the disassociation, reflection, and transmission probability of a one-dimensional cold molecule via quantum scattering. First, we show the Born approximation results in the weak interaction regime. Then, by employing the Lippmann–Schwinger equation, we give the numerical solution and investigate the disassociation’s dependence on the injection momentum and the interaction strengths. We find that the maximum disassociation rate has a limit when increasing the interaction strengths and injection momentum. We expect that our model can be realized in experiments in the near future.
{"title":"Disassociation of a one-dimensional cold molecule via quantum scattering","authors":"Wen-Liang Li, Hai-Jing Song, Tie-Ling Song, D L Zhou","doi":"10.1088/1572-9494/ad0f8d","DOIUrl":"https://doi.org/10.1088/1572-9494/ad0f8d","url":null,"abstract":"Motivated by the recent experimental developments in ultracold molecules and atoms, we propose a simple theoretical model to address the disassociation, reflection, and transmission probability of a one-dimensional cold molecule via quantum scattering. First, we show the Born approximation results in the weak interaction regime. Then, by employing the Lippmann–Schwinger equation, we give the numerical solution and investigate the disassociation’s dependence on the injection momentum and the interaction strengths. We find that the maximum disassociation rate has a limit when increasing the interaction strengths and injection momentum. We expect that our model can be realized in experiments in the near future.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"15 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139055894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-20DOI: 10.1088/1572-9494/ad10fe
Keshav Walia, Taranjot Singh
The influence of a self-focused beam on the stimulated Raman scattering (SRS) process in collisional plasma is explored. Here, collisional nonlinearity arises as a result of non-uniform heating, thereby causing carrier redistribution. The plasma density profile gets modified in a perpendicular direction to the main beam axis. This modified plasma density profile greatly affects the pump wave, electron plasma wave (EPW) and back-scattered wave. The well-known paraxial theory and Wentzel–Kramers–Brillouin approximation are used to derive second-order ordinary differential equations for the beam waists of the pump wave, EPW and the scattered wave. Further to this, the well-known fourth-order Runge–Kutta method is used to carry out numerical simulations of these equations. SRS back-reflectivity is found to increase due to the focusing of several waves involved in the process.
{"title":"The influence of a self-focused laser beam on the stimulated Raman scattering process in collisional plasma","authors":"Keshav Walia, Taranjot Singh","doi":"10.1088/1572-9494/ad10fe","DOIUrl":"https://doi.org/10.1088/1572-9494/ad10fe","url":null,"abstract":"The influence of a self-focused beam on the stimulated Raman scattering (SRS) process in collisional plasma is explored. Here, collisional nonlinearity arises as a result of non-uniform heating, thereby causing carrier redistribution. The plasma density profile gets modified in a perpendicular direction to the main beam axis. This modified plasma density profile greatly affects the pump wave, electron plasma wave (EPW) and back-scattered wave. The well-known paraxial theory and Wentzel–Kramers–Brillouin approximation are used to derive second-order ordinary differential equations for the beam waists of the pump wave, EPW and the scattered wave. Further to this, the well-known fourth-order Runge–Kutta method is used to carry out numerical simulations of these equations. SRS back-reflectivity is found to increase due to the focusing of several waves involved in the process.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"14 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139056009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-20DOI: 10.1088/1572-9494/ad109c
Changsheng Chen, Hongguang Zhang, Xianren Zhang
In our previous work [2022 Phys. Chem. Chem. Phys. 24 9685], we used molecular dynamics simulations to show that bulk nanobubbles can be stabilized by forming a compressed amphiphile monolayer at bubble interfaces. This observation closely matches the origin of stability of microemulsions and inspired us to propose here that, in certain cases, stable bulk nanobubbles can be regarded as gaseous analogues of microemulsions: the nanobubble phase and the bubble-containing solution phase coexist with the external gas phase. This three-phase coexistence is then validated by molecular dynamics simulations. The stability mechanism for bulk nanobubbles is thus given: the formation of a compressed amphiphilic monolayer because of microbubble shrinking leads to a vanishing surface tension, and consequently the curvature energy of the monolayer dominates the thermodynamic stability of bulk nanobubbles. With the monolayer model, we further interpret several strange behaviors of bulk nanobubbles: gas supersaturation is not a prerequisite for nanobubble stability because of the vanishing surface tension, and the typical nanobubble size of 100 nm can be explained through the small bending constant of the monolayer. Finally, through analyzing the compressed amphiphile monolayer model we propose that bulk nanobubbles can exist ubiquitously in aqueous solutions.
{"title":"Stable bulk nanobubbles can be regarded as gaseous analogues of microemulsions","authors":"Changsheng Chen, Hongguang Zhang, Xianren Zhang","doi":"10.1088/1572-9494/ad109c","DOIUrl":"https://doi.org/10.1088/1572-9494/ad109c","url":null,"abstract":"In our previous work [2022 <italic toggle=\"yes\">Phys. Chem. Chem. Phys</italic>. <bold>24</bold> 9685], we used molecular dynamics simulations to show that bulk nanobubbles can be stabilized by forming a compressed amphiphile monolayer at bubble interfaces. This observation closely matches the origin of stability of microemulsions and inspired us to propose here that, in certain cases, stable bulk nanobubbles can be regarded as gaseous analogues of microemulsions: the nanobubble phase and the bubble-containing solution phase coexist with the external gas phase. This three-phase coexistence is then validated by molecular dynamics simulations. The stability mechanism for bulk nanobubbles is thus given: the formation of a compressed amphiphilic monolayer because of microbubble shrinking leads to a vanishing surface tension, and consequently the curvature energy of the monolayer dominates the thermodynamic stability of bulk nanobubbles. With the monolayer model, we further interpret several strange behaviors of bulk nanobubbles: gas supersaturation is not a prerequisite for nanobubble stability because of the vanishing surface tension, and the typical nanobubble size of 100 nm can be explained through the small bending constant of the monolayer. Finally, through analyzing the compressed amphiphile monolayer model we propose that bulk nanobubbles can exist ubiquitously in aqueous solutions.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"9 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139051217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-20DOI: 10.1088/1572-9494/ad0f15
Zhening Fang, Jian-Hua Jiang, Haiping Fang
We demonstrate via first-principle calculations based on the density functional theory that the magnetic moment of a helium atom under a given magnetic field has a positive correlation with the electric dipole moment when an external electric field is applied to the system. Our calculation shows that the enhancement of the magnetic moment is significant due to the reduction of the triplet-singlet splitting. We argue that this finding can be generalized to organic molecules, especially to macromolecules where the structure induced an electric dipole moment which may give rise to significantly enhanced responses to the external magnetic field. These results suggest that considerable magnetic responses prevail, particularly in bio-molecules without an inversion center.
{"title":"A significantly enhanced magnetic moment due to an electric dipole moment","authors":"Zhening Fang, Jian-Hua Jiang, Haiping Fang","doi":"10.1088/1572-9494/ad0f15","DOIUrl":"https://doi.org/10.1088/1572-9494/ad0f15","url":null,"abstract":"We demonstrate via first-principle calculations based on the density functional theory that the magnetic moment of a helium atom under a given magnetic field has a positive correlation with the electric dipole moment when an external electric field is applied to the system. Our calculation shows that the enhancement of the magnetic moment is significant due to the reduction of the triplet-singlet splitting. We argue that this finding can be generalized to organic molecules, especially to macromolecules where the structure induced an electric dipole moment which may give rise to significantly enhanced responses to the external magnetic field. These results suggest that considerable magnetic responses prevail, particularly in bio-molecules without an inversion center.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"24 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139055971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-18DOI: 10.1088/1572-9494/ad1679
Xin-Yu Ma, Yi-Han Guan, Qiao-Nan Li, Ai-Lei He, Lu Qi
We investigate the size effect and boundary states based on a circular non-Hermitian chain under the nonreciprocal intra-cell coupling and inter-cell coupling regimes. We find that the circular non-Hermitian chain exhibits an even-odd effect of the unit cell corresponding to a large size of the chain, which is different from the open non-Hermitian chain only exhibiting the same effect for a small size of the chain. Moreover, we find that the originally localized bulk states become totally extended via designing the boundary coupling strength appropriately. The extended bulk states reveal the fact of the disappearance of non-Hermitian skin effect. Specially, we show that the circular non-Hermitian chain also possesses the analogous edge states under some parameter regimes, which is pretty counterintuitive since the circular chain usually cannot define a boundary. Our investigations supply the different non-Hermitian phenomena in a circular non-Hermitian chain.
{"title":"The size effect and analogous boundary states in a circular non-Hermitian chain","authors":"Xin-Yu Ma, Yi-Han Guan, Qiao-Nan Li, Ai-Lei He, Lu Qi","doi":"10.1088/1572-9494/ad1679","DOIUrl":"https://doi.org/10.1088/1572-9494/ad1679","url":null,"abstract":"We investigate the size effect and boundary states based on a circular non-Hermitian chain under the nonreciprocal intra-cell coupling and inter-cell coupling regimes. We find that the circular non-Hermitian chain exhibits an even-odd effect of the unit cell corresponding to a large size of the chain, which is different from the open non-Hermitian chain only exhibiting the same effect for a small size of the chain. Moreover, we find that the originally localized bulk states become totally extended via designing the boundary coupling strength appropriately. The extended bulk states reveal the fact of the disappearance of non-Hermitian skin effect. Specially, we show that the circular non-Hermitian chain also possesses the analogous edge states under some parameter regimes, which is pretty counterintuitive since the circular chain usually cannot define a boundary. Our investigations supply the different non-Hermitian phenomena in a circular non-Hermitian chain.","PeriodicalId":10641,"journal":{"name":"Communications in Theoretical Physics","volume":"85 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139173704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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