Article
Chemistry, Multidisciplinary
Michael Berger, Dominik Schulz, Jamal Berakdar
Summary: Quantum scars refer to enhanced localization of probability density of states in spectral regions with high energy levels. The study showed that spin-dependent scarring occurs in spin-coupled electronic systems, which can be detected through transport measurements or spin-polarized scanning tunneling spectroscopy.
Article
Physics, Multidisciplinary
Tsung-Wei Chen, Hsiu-Chuan Hsu
Summary: The study investigates the impact of spin precession on spin-Hall conductivity, finding both Larmor and non-Larmor spin components. The time-averaged non-Larmor SHC value is calculated for a k-cubic Rashba system, yielding a result close to experimental values.
NEW JOURNAL OF PHYSICS
(2021)
Article
Physics, Multidisciplinary
Peng Shi, Luping Du, Aiping Yang, Xiaojin Yin, Xinrui Lei, Xiaocong Yuan
Summary: In this study, a field theory was developed to reveal the physical origin and topological properties of longitudinal and transverse spins for arbitrary electromagnetic waves. The experimental results showed that the number of spin-momentum locking states coincides with the spin Chern number, providing valuable insight for constructing spin-based field theory and exploiting optical topological quasiparticle-based applications.
COMMUNICATIONS PHYSICS
(2023)
Article
Physics, Condensed Matter
S. K. Adhikari
Summary: This study investigates supersolid-like states in a quasi-two-dimensional trapped Rashba and Dresselhaus spin-orbit coupled spin-1 condensate. Different types of states are formed depending on the strength of spin-orbit coupling, including superlattice/superstripe states and multi-ring states. These states are found to be dynamically stable and will contribute to a better understanding of crystallization in solids.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Optics
Lijun Yang
Summary: Our study demonstrates the importance of quantum fluctuations in understanding the superfluid properties of spin-orbit-coupled Bose-Einstein condensates.
Article
Materials Science, Multidisciplinary
Daisuke Iizasa, Asuka Aoki, Takahito Saito, Junsaku Nitta, Gian Salis, Makoto Kohda
Summary: This study investigates the spatiotemporal spin dynamics under spin-orbit interaction in a (001) GaAs two-dimensional electron gas using magneto-optical Kerr rotation microscopy. It was found that the induction of spin precession frequency nonlinearly depends on the diffusion velocity near the cancellation between spin-orbit field and external magnetic field, contrary to conventional expectations. This unexpected behavior is attributed to the enhancement of spin relaxation anisotropy by the electron velocity perpendicular to the diffused direction.
Article
Physics, Multidisciplinary
Kevin T. Geier, Giovanni I. Martone, Philipp Hauke, Wolfgang Ketterle, Sandro Stringari
Summary: In this study, the nonrigidity and dynamic behavior of density stripes in a spin-orbit-coupled Bose-Einstein condensate with supersolidity are explored. Both analytical and numerical analysis demonstrate that spin waves induce crystal wave-like oscillations in the density profile, affecting the periodicity and orientation of the fringes. These findings highlight the paradigmatic nature of this system as a supersolid with a fully dynamic crystalline structure.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Pardeep Kaur, Sandeep Gautam, S. K. Adhikari
Summary: We studied the emergence of supersolid-like crystalline structures in a quasi-two-dimensional spin-orbit coupled spin-2 condensate. Different strengths of spin-orbit coupling and interatomic interactions led to a variety of nontrivial density patterns in the solutions.
Article
Multidisciplinary Sciences
A. Valdes-Curiel, D. Trypogeorgos, Q. -Y. Liang, R. P. Anderson, I. B. Spielman
Summary: In this study, researchers explore the topology in spin-orbit coupled 87Rb atoms using time domain spectroscopy and quantum state tomography. They measure the full quantum state to extract the Berry phase of the system and demonstrate signatures of a half-integer Chern index.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Pardeep Kaur, Sandeep Gautam, S. K. Adhikari
Summary: We demonstrate the spontaneous generation of spatially-periodic supersolid-like super-lattice and stripe solitons in Rashba spin-orbit coupled spin-1 and spin-2 quasi-two-dimensional nonmagnetic Bose-Einstein condensates. The solitons in a weakly spin-orbit coupled spin-1 condensate are circularly-symmetric with inherent vorticity, while the solitons in an spin-orbit coupled spin-2 condensate have multiple types of circularly-symmetric shapes and can acquire a multiring structure with stronger coupling strengths. Additionally, quasi-degenerate stripe and super-lattice solitons emerge as excited stationary states for stronger spin-orbit coupling strengths.
Article
Physics, Applied
Maik Delon Mboumba, Gleann Juvet Ngounga Makoundit, Christian Kenfack Sadem, Alain Brice Moubissi, Timoleon Crepin Kofane
Summary: Recent research on ultra-cold quantum gases has revealed that dipolar Bose-Einstein condensates with local and nonlocal interactions exhibit complex spatiotemporal dynamics. In this study, we investigate the possibility of controlling soliton molecule formation and dynamics in binary dipolar condensates with spin-orbit coupling. By employing the variational technique, we derive new equations of motion for the widths, amplitudes, potential, and oscillation frequency of the molecules. Our findings confirm the existence of stable localized bound states in an optical potential and indicate that the integrity of the molecules is influenced by physical parameters and the presence of spin-orbit coupling. The Vakhitov-Kolokolov criterion is used to select these parameters and ensure molecular stability. Numerical experiments support our analytical predictions, and we also observe soliton-soliton interactions within each molecule under strong local interactions.
MODERN PHYSICS LETTERS B
(2023)
Article
Multidisciplinary Sciences
JeongHun Shin, Jeongwoo Seo, Saegyoung Song, WooJong Kim, Da Seul Hyeon, JinPyo Hong
Summary: CMOS-based logic devices still have limitations such as leakage currents and volatile behavior. Reconfigurable logic gates based on magnetic domain offer fast operation, nonvolatility, and diverse logic functions. In this study, multiple reconfigurable magnetic domain logic gates were achieved in a single device by controlling spin-orbit torque and anomalous Hall effect voltage outputs. These experimental findings have significant implications for future magnetic domain logic applications.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Multidisciplinary
S. K. Adhikari
Summary: In this study, spontaneous spatial order in stripe and super-lattice solitons in a Rashba spin-orbit coupled spin-1 ferromagnetic Bose-Einstein condensate is demonstrated. The type of solitons changes with the strength of the SO coupling, with different types of solitons found for weak, intermediate, and large SO coupling strengths.
Article
Physics, Applied
Qiang Zhao
Summary: In this paper, the spin dynamics of spin-2 Bose-Einstein condensates with spin-orbit coupling and dipole-dipole interaction are studied. The results show that the periodic oscillation of spin dynamics is broken in the presence of dipole-dipole interaction, and the thermalization time decreases with increasing magnetization.
MODERN PHYSICS LETTERS B
(2022)
Article
Physics, Multidisciplinary
Juan-juan Qi, Dun Zhao, Wu-Ming Liu
Summary: We analytically investigate the effects of spin-orbit coupling (SOC) on soliton collisions in spin-1 Bose-Einstein condensates (BECs). By using the non-standard Hirota's bilinear method, we derive exact soliton solutions for a 1D spin-orbit coupled spin-1 BEC, revealing how SOC can manipulate the dynamics of solitons in spinor BECs. We discuss in detail the soliton collisions of different types under SOC, including ferromagnetic-polar, ferromagnetic-ferromagnetic, and polar-polar collisions. Comparisons between systems with and without SOC show a remarkable phenomenon: SOC can cause the splitting of a soliton.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
Article
Chemistry, Multidisciplinary
Chuyi Ni, Yahao Huang, Tao Zeng, Daohong Chen, Hao Chen, Mingyang Wei, Andrew Johnston, Andrew H. Proppe, Zhijun Ning, Edward H. Sargent, Peng Hu, Zhenyu Yang
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2020)
Article
Chemistry, Physical
Ekadashi Pradhan, Jordan N. Bentley, Christopher B. Caputo, Tao Zeng
Article
Chemistry, Physical
Ekadashi Pradhan, Seunghoon Lee, Cheol Ho Choi, Tao Zeng
JOURNAL OF PHYSICAL CHEMISTRY A
(2020)
Article
Chemistry, Physical
James Brown, Robert A. Lang, Tao Zeng
Summary: The formalism allows for expansions of Jahn-Teller and pseudo-Jahn-Teller Hamiltonian operators in all axial symmetries up to arbitrarily high order, including an arbitrary number of vibrational modes. It is user-friendly and has been demonstrated to be correct through an example. Additionally, a Python program has been developed to automate the generation of these Hamiltonian expansions and interface with a quantum dynamics simulation program.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2021)
Article
Chemistry, Multidisciplinary
Dylan James, Ekadashi Pradhan, Seunghoon Lee, Cheol Ho Choi, Tao Zeng
Summary: Singlet fission is a desired process in photovoltaic devices for enhancing photoelectric conversion efficiency. However, the lack of appropriate chromophores has hindered its exploitation in photovoltaics. In this study, mixed-reference spin-flip time-dependent density functional theory (TDDFT) was used to investigate five dicarbonyl anthracenes and phenanthrenes, aiming to design singlet fission chromophores. Two promising candidates were identified, and it was found that the oxygen lone pair orbitals were involved in the excited states relevant to singlet fission.
CANADIAN JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Physical
James Brown, Ekadashi Pradhan, Tao Zeng
Summary: A unified one-electron Hamiltonian formalism for spin-orbit and vibronic interactions in systems with all axial symmetries has been derived, covering various vibrational modes and an arbitrary number of modes up to an arbitrary order.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Dylan James, Ekadashi Pradhan, Tao Zeng
Summary: In this work, we designed a series of singlet fission chromophores by introducing N-oxyl fragments into anthracene, satisfying the thermodynamic energy criteria for singlet fission chromophores.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Gregoire David, Nadia Ben Amor, Tao Zeng, Nicolas Suaud, Georges Trinquier, Jean-Paul Malrieu
Summary: C-4n cyclacenes exhibit strong bond-alternation in their equilibrium geometry, transitioning from a closed-shell character to a diradical state. This paper discusses the physical factors involved in the energy difference and explores different methods for evaluating the barrier height. The most reliable results are obtained using specific wave function theory calculations.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Ekadashi Pradhan, Guoying Yao, Zhenyu Yang, Tao Zeng
Summary: Heavy element compounds with high symmetries often have both spin-orbit coupling and vibronic coupling, particularly in systems with tetrahedral and octahedral symmetries. To accurately describe these interactions, high quality spin-orbit vibronic Hamiltonian operators are needed. This study presents a unified Hamiltonian formalism for spin-orbit vibronic interactions in all tetrahedral and octahedral symmetries, generating Hamiltonian expansion formulas of arbitrarily high order.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Guoying Yao, Liang Zhao, Tao Zeng, Zhenyu Yang
Summary: Reduced-dimensional (RD) perovskites have attractive properties for optoelectronic applications. However, the coexistence of different organic ligands commonly inhibits the formation of more complex crystal structures. In this study, a mixed-dimensional (MD) perovskite single crystal containing two types of sulfide-containing ligands was reported. X-ray diffraction confirmed the structure contains layered and isolated inorganic components. The MD perovskite showed an enlarged bandgap and isotropic optical features.
Article
Chemistry, Multidisciplinary
Zilong Yuan, Liang Zhao, Ekadashi Pradhan, Ming Lai, Tao Zeng, Zhenyu Yang
Summary: This study reports the postsynthetic crystal transformation of two-dimensional metal halide perovskites (2D MHPs) through organothiol-based reactions in solution. The swift and complete crystal interconversion of large organic cations in three types of 2D MHPs under ambient conditions has been confirmed.
Article
Chemistry, Physical
Ekadashi Pradhan, Tao Zeng
Summary: In this study, we designed a novel intramolecular singlet fission chromophore that can accommodate a pair of triplet excitons in its lowest singlet excited state. Our simulation demonstrated a 16 fs fast singlet fission, setting a new record for small size iSF chromophore and high exciton density.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Organic
Jordan N. Bentley, Selvyn A. Simoes, Ekadashi Pradhan, Tao Zeng, Christopher B. Caputo
Summary: The evolution of frustrated Lewis pair chemistry has driven research into new Lewis acidic boranes, with a focus on amino substituents as effective catalysts. Quantum chemical calculations identified the most Lewis acidic aminoborane, showing high catalytic efficacy even in coordinating solvents.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Nayanthara Asok, Joshua R. Gaffen, Ekadashi Pradhan, Tao Zeng, Thomas Baumgartner
Summary: In this study, a series of neutral pentacoordinate dithieno[3,2-b:2',3'-d]phosphole compounds were synthesized, which exhibit square pyramidal geometry and Lewis acidic nature. These compounds show potential as mediators in organic transformations.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Inorganic & Nuclear
Jordan N. Bentley, Ekadashi Pradhan, Tao Zeng, Christopher B. Caputo
DALTON TRANSACTIONS
(2020)
