Article
Chemistry, Multidisciplinary
Dharmendra Pant, Sandip Aryal, Subhasish Mandal, Ranjit Pati
Summary: Researchers have revealed ferromagnetism in twisted bilayer graphene nanoflex using first-principles approach, finding that the ferromagnetic phase appears irregularly between 0 and 30 degrees, rather than only at specific “magic angles”. The origin of electronic instability is attributed to aperiodic modulation of interlayer interaction in the nanoflex, resulting in the breaking of several higher-symmetry phases to lower the energy.
Article
Astronomy & Astrophysics
R. L. P. G. Amaral, V. E. R. Lemes, O. S. Ventura, L. C. Q. Vilar
Summary: After the phase transition of a grand unified theory, the couplings of the basic interactions split from the single coupling. In the symmetric phase, the couplings associated with SU(2) and U(1) symmetries were already distinct before the electroweak breaking, as determined by the measurement of the Weinberg mixing angle. Each independent coupling should be associated with independent cocycles defined on a cohomological basis from the perspective of BRST symmetry.
Article
Chemistry, Multidisciplinary
Mingwen Zhang, Nannan Han, Jing Wang, Zhihong Zhang, Kaihui Liu, Zhipei Sun, Jianlin Zhao, Xuetao Gan
Summary: This study reports that redox-governed charge doping can effectively break the centrosymmetry of bilayer graphene, enabling a strong second harmonic generation (SHG). Control experiments confirm this result and demonstrate that charge doping is an effective method to break the inversion symmetry of bilayer graphene, and SHG spectroscopy is a valid technique to probe molecular doping on two-dimensional materials.
Article
Physics, Multidisciplinary
Deshui Yu, Frank Vollmer
Summary: This study introduces a new model that takes into account the internal dynamics of active particles, and numerically investigates the PT symmetry of macroscopic- and microscopic-sized laser systems operating in the strong-coupling regime. Distinct phase diagrams are drawn based on the features of intracavity photon numbers and emission spectra. This work extends PT-symmetric optics from weak to strong coupling limits, potentially leading to nonclassical PT-symmetric light sources for integrated photonic networks and ultrasensitive sensors.
COMMUNICATIONS PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Mojca Vilfan, Borut Lampret, Ziga Gregorin, Luka Cmok, Andrej Vilfan, Juergen Klepp, Joachim Kohlbrecher, Patricija Hribar Bostjancic, Darja Lisjak, Alenka Mertelj
Summary: The authors report on the experimental observation of spontaneous stripe formation in a ferromagnetic ferrofluid in the presence of an oscillating external magnetic field. The striped structure is identified as elongated magnetic domains, which exhibit reorientation upon reversal of the magnetic field. The stripes are oriented perpendicular to the magnetic field and are separated by alternating flow lanes.
Article
Materials Science, Multidisciplinary
Hetian Chen, Di Yi, Ben Xu, Jing Ma, Cewen Nan
Summary: By using first-principles simulations, the properties of an edge dislocation core in SrTiO3 were explored, revealing spontaneous symmetry breaking and proposing a model to quantitatively estimate the atomic configuration of SrTiO3 under complex strain conditions.
MATERIALS TODAY PHYSICS
(2021)
Article
Astronomy & Astrophysics
C. A. Escobar, Roman Linares
Summary: This work explores the spontaneous symmetry breaking in certain nonlinear theories with second-class constraints. The constraints and degrees of freedom are analyzed using Dirac's method, and the corresponding effective Hamiltonian is explicitly constructed. It is shown that at critical values of the effective Hamiltonian, the symplectic structure becomes degenerate. Under the condition of spontaneous symmetry breaking, the second-class constraints behave as first-class ones on certain regions of the phase space, leading to undefined Dirac's brackets and a modification of the number of degrees of freedom.
Article
Physics, Multidisciplinary
Stelios M. Potirakis, Yiannis Contoyiannis, Konstantinos Eftaxias, Nikolaos S. Melis, Constantinos Nomicos
Summary: Recent research has found that the evolution of a strong earthquake (EQ) monitored through fracture-induced electromagnetic emissions (EME) in the MHz band has similarities with the evolution of a thermal system as temperature decreases. By comparing fracture-induced MHz EME associated with the strongest EQs (M-W = 6.9) that occurred in Greece over the past twenty years with the 3D Ising model, it is possible to determine whether the occurrence of power-laws immediately after a very strong EQ indicates the preparation of a new strong EQ.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2022)
Article
Physics, Multidisciplinary
G. Endrodi, T. G. Kovacs, G. Marko
Summary: This study investigates spontaneously broken quantum field theories with a continuous global symmetry group using the constraint effective potential approach. It finds that the path integral is dominated by inhomogeneous field configurations related to the flatness of the effective potential in the broken phase. The study introduces the concept of differential surface tension to characterize inhomogeneities and explores possible implications for the chiral limit of QCD.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Manabendra Kuiri, Christopher Coleman, Zhenxiang Gao, Aswin Vishnuradhan, Kenji Watanabe, Takashi Taniguchi, Jihang Zhu, Allan H. MacDonald, Joshua Folk
Summary: This study discovered a strong anomalous Hall effect in twisted double bilayer graphene, suggesting the breaking of time reversal symmetry due to orbital ferromagnetism. Gate voltages applied to the device can tune both the flatness and topology of the electronic bands, providing an unusual level of experimental control.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Michael Winer, Brian Swingle
Summary: The spectral statistics of quantum chaotic systems are influenced by global symmetries and symmetry breaking, showing clear signatures in the energy eigenvalues.
Article
Materials Science, Multidisciplinary
Riccardo Ciola, Kitinan Pongsangangan, Ronny Thomale, Lars Fritz
Summary: Research on kagome metals reveals the possibility of chiral symmetry breaking, with a dimerization pattern identified as the leading instability causing excitation gap opening at the Dirac point and breaking chiral symmetry. Through a lattice model analysis, the critical coupling strength and ordering pattern were determined, shedding light on the unique characteristics of kagome metals.
Article
Physics, Multidisciplinary
D. D. Solnyshkov, C. Leblanc, I Septembre, G. Malpuech
Summary: We conducted a numerical study on exciton-polariton condensation in a staggered polariton graphene with a gapped s band, and found that the condensation occurs at the negative mass extrema of the valence band, resulting in the formation of valley-polarized domains. The walls separating these domains exhibit a reconfigurable topologically protected chiral current.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Kimberly Hsieh, Vidya Kochat, Tathagata Biswas, Chandra Sekhar Tiwary, Abhishek Mishra, Gopalakrishnan Ramalingam, Aditya Jayaraman, Kamanio Chattopadhyay, Srinivasan Raghavan, Manish Jain, Arindam Ghosh
Summary: Experimental results demonstrate that graphene grain boundaries spontaneously break time-reversal symmetry, leading to complete destruction at high carrier densities and low temperatures. Moreover, a significant reduction in universal conductance fluctuation magnitude with increasing doping density supports the possibility of an emergent frozen magnetic state at the grain boundaries.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
J. N. Stehouwer, H. T. C. Stoof, J. Smits, P. van der Straten
Summary: The theory of spontaneous symmetry breaking (SSB) of discrete time translations, realized in the space-time crystals of an atomic Bose-Einstein condensate, is presented. The nonequilibrium physics related to such a driven-dissipative system is discussed in both Langevin and Fokker-Planck formulations, depending on the dissipation being frequency independent or linearly dependent on frequency. The results are compared with experiments, showing that the theory provides a solid foundation for the observations.
Article
Physics, Multidisciplinary
Juan Mauricio Torres, Thomas H. Seligman
NEW JOURNAL OF PHYSICS
(2017)
Article
Physics, Multidisciplinary
Thomas Stegmann, John A. Franco-Villafane, Yenni P. Ortiz, Ulrich Kuhl, Fabrice Mortessagne, Thomas H. Seligman
Article
Chemistry, Multidisciplinary
Yenni P. Ortiz, Douglas J. Klein, Joel F. Liebman
STRUCTURAL CHEMISTRY
(2018)
Article
Multidisciplinary Sciences
Manan Vyas, T. Guhr, T. H. Seligman
SCIENTIFIC REPORTS
(2018)
Article
Physics, Multidisciplinary
Hirdesh K. Pharasi, Kiran Sharma, Rakesh Chatterjee, Anirban Chakraborti, Francois Leyvraz, Thomas H. Seligman
NEW JOURNAL OF PHYSICS
(2018)
Article
Chemistry, Multidisciplinary
D. J. Klein, T. Goswami, Y. P. Ortiz
JOURNAL OF MATHEMATICAL CHEMISTRY
(2020)
Article
Chemistry, Physical
Douglas J. Klein, Yenni P. Ortiz, Laimutis Bytautas
INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY
(2020)
Article
Materials Science, Multidisciplinary
Thomas Stegmann, John A. Franco-Villafane, Yenni P. Ortiz, Michael Deffner, Carmen Herrmann, Ulrich Kuhl, Fabrice Mortessagne, Francois Leyvraz, Thomas H. Seligman
Proceedings Paper
Physics, Multidisciplinary
Manan Vyas, Thomas H. Seligman
LATIN AMERICAN SCHOOL OF PHYSICS MARCOS MOSHINSKY (ELAF2017) - QUANTUM CORRELATIONS
(2018)
Article
Chemistry, Physical
Yenni P. Ortiz, Thomas Stegmann, Douglas J. Klein, Thomas H. Seligman
CHEMICAL PHYSICS LETTERS
(2017)
Article
Materials Science, Multidisciplinary
Thomas Stegmann, John A. Franco-Villafane, Ulrich Kuhl, Fabrice Mortessagne, Thomas H. Seligman
Article
Physics, Fluids & Plasmas
Harinder Pal, Thomas H. Seligman, Juan Escobar
Correction
Chemistry, Physical
Chen Luo, Yan Shao, Hua Yu, Hong-zhi Ma, Yu-hao Zhang, Long Gu, Bo Yin, Ming-bo Yang
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Stefano Borocci, Armando Camerlingo, Felice Grandinetti, Maria Rutigliano, Nico Sanna
Summary: The complexes of He, Ne, Ar, Kr, and Xe with B3N3H6 were investigated using MP2, CCSD(T), and SAPT ab initio methods. The complexes can be described as mono-, di-, and tri-coordinated to the N atoms, with stability following the order N-mono < N-di < N-tri. The interactions are dominated by dispersion and the binding energies are within the range of 1 or 2 kcal mol(-1). The results were compared with a recent DFT study on larger BN sheets complexes [Phys. Chem. Chem. Phys. 24 (2022) 2554-2566.].
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
V. Nagarajan, R. Bhuvaneswari, R. Chandiramouli
Summary: In this study, stable phosphoborane was used as a sensor to detect isobutane and n-propane in Liquefied Petroleum Gas (LPG). Phosphoborane demonstrated structural stability and semiconducting nature, and exhibited promising adsorption properties for the LPG molecules.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Xiaoxi Xu, Zijiang Yang, Bayaer Buren, Maodu Chen
Summary: In this study, the time-dependent wave packet method was used to investigate the reaction channels and mechanisms of Ca+ + HD. The results show that the CaH+ + D reaction channel plays a primary role, which is consistent with experimental results. Complex forming and direct-abstraction reaction mechanisms exist in this reaction process.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Keshab Pandey, Hae Kyung Jeong
Summary: A free-standing silicon-carbon nanofiber composite film was synthesized and investigated for supercapacitor applications. It exhibited high specific capacitance, energy density, and power density. After 5000 cycles, the film showed excellent specific capacitance retention and Coulombic efficiency.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Xinyu Zhang, Haosong Li, Xiaoyu Cao, Jing Gao, Yong Wei, Jianzhuo Zhu
Summary: The evaporation behavior of nanosized water aggregations on two-dimensional electroneutral solid surfaces with different surface polar unit densities was investigated. The results showed that the evaporation rate changes non-monotonically with the surface polar unit density, and the minimum evaporation rate is obtained when the surface has a modest surface polar unit ratio of 66.7%.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Yanyan Xu, Rui Dai, Xiaojie Wang, Zhijun Qiao, Haowei Wen, Dianbo Ruan, Yuzuo Wang
Summary: This article presents an innovative solvothermal sodium insertion method for synthesizing Triphylite-NaFePO4, which demonstrates optimal electrochemical performance in sodium-ion batteries.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Meiyi Jiang, Kun Yang, Yancheng Liu, Li Yao
Summary: The geometric structure and electronic properties of transition metal M (M = Cu, Fe, Mn)-TiO2 (101) surface adsorbed by NO2 and N2O were calculated by density functional theory (DFT) and DFT + U theory. The results showed that the adsorption of NO2 and N2O on Mn and Fe atoms is more stable, and a large number of active electrons are formed around these atoms, facilitating the catalytic reactions.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Sergey A. Vyrko, Yulia G. Polynskaya, Nikita A. Matsokin, Andrey M. Popov, Andrey A. Knizhnik, Nikolai A. Poklonski, Yurii E. Lozovik
Summary: In this study, carbon nanobracelets, which are cyclic molecules composed of alternating polycyclic regions and double carbon chains, were investigated using spin-polarized density functional theory. The results show that carbon nanobracelets with odd number of monomers exhibit distinct electronic energy levels, band gaps, and carbon chain deformation compared to those with even number of monomers.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Chanchan Wang, Quan Yang, Yanzhi Ding, Xiaoyong Lu, Dong Tian
Summary: It has been found that the introduction of buffer layers improves the electrical performance of solid oxide fuel cells (SSOFCs). In this study, varying ratios of Gd-doped CeO2 were used as buffer layers in YSZ-based SSOFCs. The results demonstrate that the performance of SSOFCs is enhanced when a buffer layer is added, with the highest performance achieved using Ce0.8Gd0.2O2-delta (GDC20) as the buffer layer. This suggests that the use of GDC series buffer layers is an attractive strategy to optimize performance loss due to electrolyte-electrode interactions.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Wang Li, Yi-Fan Zhang, Jia-Bin Huang, Chang-Yang Wang, Feng Zhang, Jiu-Zhong Yang, Long Zhao
Summary: The gas-phase reaction of propargyl with vinylacetylene was investigated using synchrotron photoionization and molecular-beam mass spectrometry methodologies. The formation mechanisms of the resulting cyclic structures were examined using quantum computations. Two previously unidentified isomers were detected and identified for the first time.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Avijit Pramanik, Sanchita Kundu, Olorunsola Praise Kolawole, Kaelin Gates, Paresh Chandra Ray
Summary: This study investigates the influence of aspect ratio and quantum confinement on the single-photon and two-photon absorption cross-section of perovskite CsPbI3 nanorods. Experimental data shows that CsPbI3 nanorods have an extremely high two-photon absorption cross-section, significantly surpassing organic chromophores and other CsPbBr3 nanocrystals. Moreover, adjusting the aspect ratio can significantly enhance the absorption ability. Additionally, the study also reveals a moderate quantum confinement effect on the single-photon and two-photon absorption cross-section of the nanorods.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Hyon-Tae Pak, Jin-A Choe, Kyong-Sik Ju, Yong -Son Rim
Summary: Drug-loaded cellulose diacetate (CDA) membranes were prepared using different compositions of mixed solvent. The microstructure and performance of the membranes were investigated, and a method to predict drug release properties was proposed. The results showed that the composition of the mixed solvent significantly affected the overall performance of CDA membranes, and the release rates of drugs were related to Δdelta and the intrinsic viscosity of CDA.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Gabriella E. Ravin, E. Curotto
Summary: We have developed a systematic approach to optimize the training set sizes for neural networks in fitting ab initio potential energy surfaces. Using this approach, we have constructed several spectroscopic quality potential energy surfaces for [Li(H2)n]+, n = 1 - 9. The ground state properties have been computed for all the systems and selected states.
CHEMICAL PHYSICS LETTERS
(2024)
Article
Chemistry, Physical
Guohua Xu, Lei Xu, Feng Zhang, Chunling Yu, Yu Song
Summary: NiS1.03@Ni7S6/carbon composite was successfully prepared using corn stalk as a carbon source via a simple adsorption-sulphurization process. The composite exhibited a specific capacitance of 1554.6 F/g at 1 A/g as a supercapacitor electrode, with a capacitance retention rate of 80.4% after 5000 cycles. Furthermore, the NiS1.03@Ni7S6/carbon//AC asymmetric supercapacitor showed a high energy density of 41.2 Wh kg-1 at a power density of 750 W kg-1, and excellent cycling stability with 86.8% capacitance retention after 10,000 cycles.
CHEMICAL PHYSICS LETTERS
(2024)