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
Materials Science, Multidisciplinary
Qingbo Wang, Wenjing Zhao, Linghua Wen
Summary: The study reveals that spin-orbit coupling has a significant influence on the dynamics of kicked pseudo-spin-1/2 Bose-Einstein condensates under different conditions, mainly reflected in the different behaviors of density distribution and energy evolution.
RESULTS IN PHYSICS
(2021)
Article
Optics
Huan Zhang, Sheng Liu, Yong-Sheng Zhang
Summary: This study investigates Faraday patterns generated by parametric resonance induced by spin-orbit coupling in a spinor Bose-Einstein condensate with repulsive interaction. The interplay between Faraday instabilities and modulation instabilities during a quench when the spin-orbit coupled Bose-Einstein condensate transitions from zero-momentum phase to plane-wave phase is examined.
Article
Physics, Multidisciplinary
Jie Wang, Jun-Cheng Liang, Zi-Fa Yu, An-Qing Zhang, Ai-Xia Zhang, Ju-Kui Xue
Summary: We study the ground state phases of quasi-one-dimensional spin-orbit coupled spin-1 Bose-Einstein condensates trapped in a harmonic potential. Based on variational analysis, we obtain the conditions for phase transition between magnetized and unmagnetized phases analytically for the first time, and reveal the physical mechanism of inducing phase transition. We discuss the competition relationship among spin-independent interaction, spin-dependent interaction, spin-orbit (SO) coupling, and the harmonic potential for generating phase transition systematically.
Article
Mathematics, Interdisciplinary Applications
Yunjia Zhai, Yongping Zhang
Summary: In a two-dimensional atomic Bose-Einstein condensate, we have shown that Rashba spin-orbit coupling can always lead to dynamical instability and fragmentation of specific zero-quasimomentum states, resulting in dynamic patterning. The characteristics of the formed patterns can be identified through the symmetries of the Bogoliubov-de Gennes Hamiltonian. We demonstrate that spin-orbit-coupled Bose-Einstein condensates provide an interesting platform for studying pattern formations.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Optics
Huan-Bo Luo, Boris A. Malomed, Wu-Ming Liu, Lu Li
Summary: A method is proposed to achieve controllable inversion of energy levels in a one-dimensional spin-orbit-coupled two-component Bose-Einstein condensate, allowing the transformation of any excited state into the ground state by adjusting the strength of the spin-orbit coupling and magnetic-field gradient.
Article
Physics, Multidisciplinary
Ji-Guo Wang, Yue-Qing Li, Shi-Jie Yang
Summary: In this study, we investigated the ground-state phases of spin-orbit coupled spin-3 Bose-Einstein condensates. The competition between different spin-singlet interactions and spin-orbit coupling results in various ground-state phases, including stripe phase, ring phase, transition phase, triangular lattice phase, rectangular lattice phase, and octagonal lattice phase.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2022)
Article
Mathematics, Applied
Zhaopin Chen, Yongyao Li, Yan Liu, Boris A. Malomed
Summary: By using numerical methods, it is found that symmetric two-layer solitons in a double-layer system undergo a spontaneous-symmetry-breaking (SSB) bifurcation, producing families of asymmetric 2D solitons. The collapse occurs when the soliton's norm exceeds the norm of the Townes solitons. The SSB instability leads to dynamical symmetry breaking and spontaneous drift in the solitons.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2023)
Article
Physics, Multidisciplinary
Jie Wang, Jun-Cheng Liang, Zi-Fa Yu, An-Qing Zhang, Ai-Xia Zhang, Ju-Kui Xue
Summary: We analytically and numerically study the nonlinear collective dynamics of quasi-one-dimensional spin-orbit coupled spin-1 Bose-Einstein condensates in a harmonic potential. The ground state is determined by minimizing the Lagrange density, and the equations of motions for the center-of-mass coordinate and width are derived. We obtain two low energy excitation modes, breathing dynamics and dipole dynamics, analytically, and reveal the mechanism of exciting anharmonic collective dynamics. The coupling among spin-orbit coupling, Raman coupling, and spin-dependent interaction leads to multiple external collective modes and coupling between dipolar and breathing dynamics, with distinct behaviors in different phases.
Article
Mathematics, Applied
Yali Gao, Liquan Mei
Summary: In this paper, a time-splitting method is developed to investigate the evolution of spin-orbit-coupled Bose-Einstein condensates. The fully discrete scheme combines second-order timesplitting method for temporal discretization and Galerkin finite element method for spatial discretization. Numerical simulations validate the method's features and simulate waves interacting with trapping potentials in two and three dimensions.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Qingbo Wang, Jinguo Hu, Xianghua Su, Linghua Wen
Summary: The study explores the dynamics of rotating pseudo-spin-1/2 Bose-Einstein condensates with Rashba spin-orbit coupling in a quasicrystalline optical lattice. It was observed that the system evolves from an initial heliciform-stripe phase into a final visible vortex necklace with a giant vortex and a hidden vortex necklace. The corresponding spin texture undergoes a transition from a meron-antimeron pair to a half-antiskyrmion necklace during the dynamic evolution process.
RESULTS IN PHYSICS
(2021)
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
Mathematics, Interdisciplinary Applications
Chunyan Li, Vladimir V. Konotop, Boris A. Malomed, Yaroslav V. Kartashov
Summary: This study reveals the mechanism of linear and nonlinear localization induced by spatially periodic modulation of spin-orbit coupling. It shows that specific chemical potential can lead to localized solitons or vortex solitons, and their stability strongly depends on the potential's location in the gaps.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Physics, Multidisciplinary
Ji Li, Tianchen He, Jing Bai, Bin Liu, Huan-Yu Wang
Summary: By numerically solving the coupled Gross-Pitaevskii equations, this study investigates the ground states of spin-1 Bose-Einstein condensates with spin-orbit coupling in a radially periodic potential. It is found that spin-orbit coupling leads to different phase structures in Bose-Einstein condensates with different spin properties, and the strength of spin-orbit coupling can control the properties of the condensates.
Article
Optics
Keyan Liu, Huaxin He, Chenhui Wang, Yuanyuan Chen, Yongping Zhang
Summary: This study combines spin-orbit coupling, spin-1 Bose-Einstein condensates, and toroidal traps, and analyzes the ground-state phase diagram. The spin-flip symmetries give rise to two interesting phases.
Article
Physics, Condensed Matter
V Lahtinen, M. Mottonen
JOURNAL OF PHYSICS-CONDENSED MATTER
(2020)
Article
Nanoscience & Nanotechnology
Jinli Zhang, Tianyi Li, Roope Kokkoniemi, Chengyu Yan, Wei Liu, Matti Partanen, Kuan Yen Tan, Ming He, Lu Ji, Leif Gronberg, Mikko Mottonen
Article
Multidisciplinary Sciences
R. Kokkoniemi, J. -P. Girard, D. Hazra, A. Laitinen, J. Govenius, R. E. Lake, I. Sallinen, V. Vesterinen, M. Partanen, J. Y. Tan, K. W. Chan, K. Y. Tan, P. Hakonen, M. Mottonen
Editorial Material
Quantum Science & Technology
Markku Rasanen, Henrikki Makynen, Mikko Mottonen, Jan Goetz
Summary: Quantum computing has the potential to bring great economic prosperity to the European Union, but creating successful businesses in this field is challenging due to the required investments and infrastructure. The EU is making efforts to foster the quantum-computing ecosystem, proposing concrete actions for future growth and suggesting the creation of EU-based quantum-computing unicorns to drive technology and commercialization. These unicorns may serve as key points in pushing forward global policies and distinguishing the EU quantum ecosystem from others.
EPJ QUANTUM TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Chengyu Yan, Juha Hassel, Visa Vesterinen, Jinli Zhang, Joni Ikonen, Leif Gronberg, Jan Goetz, Mikko Mottonen
Summary: The study presents an on-chip device based on a Josephson junction capable of coherent microwave emission, meeting the requirements for quantum-coherent operations. The characteristics of the device adhere to a perturbative theory based on a capacitively shunted Josephson junction, with low phase noise from the cryogenic microwave source resulting in infidelity lower than that caused by dephasing in superconducting qubits.
NATURE ELECTRONICS
(2021)
Article
Physics, Applied
Tasio Gonzalez-Raya, Mateo Casariego, Florian Fesquet, Michael Renger, Vahid Salari, Mikko Mottonen, Yasser Omar, Frank Deppe, Kirill G. Fedorov, Mikel Sanz
Summary: Microwave technology plays a crucial role in wireless communications, and understanding its limitations in realistic open-air settings is important for its development. This study investigates the feasibility of open-air entanglement distribution with microwave two-mode squeezed states and explores techniques to improve quantum correlations and increase the reach of entanglement.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Multidisciplinary
Toni Annala, Roberto Zamora-Zamora, Mikko Mottonen
Summary: This study presents research on topological knots and linked structures, constructs topologically protected links that cannot be untied through local reconnections, and proposes a classification scheme for topological vortex links.
COMMUNICATIONS PHYSICS
(2022)
Article
Instruments & Instrumentation
J. -P. Girard, R. E. Lake, W. Liu, R. Kokkoniemi, E. Visakorpi, J. Govenius, M. Mottonen
Summary: Recently, progress has been made in ultrasensitive microwave detectors, but their range of applications is limited due to a lack of compatibility with broad-band metrologically traceable power absorption measurements. In this study, an ultralow-noise nanobolometer with an additional dc heater input was used to make such measurements. The power absorption was traced by comparing the bolometer response between radio frequency and dc-heating powers traced to the Josephson voltage and quantum Hall resistance. The ability to accurately measure the attenuation of a coaxial input line between 50 MHz and 7 GHz with an uncertainty down to 0.1 dB at a typical input power of -114 dBm was demonstrated.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Review
Quantum Science & Technology
Mateo Casariego, Emmanuel Zambrini Cruzeiro, Stefano Gherardini, Tasio Gonzalez-Raya, Rui Andre, Goncalo Frazao, Giacomo Catto, Mikko Moettoenen, Debopam Datta, Klaara Viisanen, Joonas Govenius, Mika Prunnila, Kimmo Tuominen, Maximilian Reichert, Michael Renger, Kirill G. Fedorov, Frank Deppe, Harriet van der Vliet, A. J. Matthews, Yolanda Fernandez, R. Assouly, R. Dassonneville, B. Huard, Mikel Sanz, Yasser Omar
Summary: The field of propagating quantum microwaves is gaining attention for its promising technological applications in communication and sensing. Despite similarities with quantum optics, the development of a controllable quantum microwave interface is still in its early stages. This article argues for the need of a fully operative toolbox for propagating quantum microwaves, and explores novel directions of research such as microwave quantum key distribution, quantum radar, bath-system learning, and direct dark matter detection. It serves as both a review of the state-of-the-art and an illustration of the wide range of applications that quantum microwaves can offer in the future.
QUANTUM SCIENCE AND TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Toni Annala, Mikko Mottonen
Summary: This paper focuses on topological defects in mean-field-theory treatments of physical systems. The ambiguity and addition of topological charges are investigated using the mathematical formalism of covering spaces, clarifying many aspects of these phenomena. Topological-defect configurations consisting of several monopoles and unknotted ring defects are classified in terms of homotopy groups and fundamental-group actions, generalizing previous classifications. The decay of multiply charged topological monopoles under small perturbations and the conditions for their splitting into singly charged monopoles are analyzed.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Vasilii Vadimov, Jani Tuorila, Tuure Orell, Juergen Stockburger, Tapio Ala-Nissila, Joachim Ankerhold, Mikko Mottonen
Summary: The research compared the applicability of different master equations in the case of resonant qubits transversely coupled to a Drude-cut ohmic bath, finding that weak-coupling methods have significant limitations in practical applications, requiring careful choice of modeling methods to ensure accuracy.
Article
Physics, Multidisciplinary
V. Vadimov, T. Hyart, J. L. Lado, M. Mottonen, T. Ala-Nissila
Summary: In this study, zero modes emerge in a many-body system without gauge symmetry breaking and in the absence of superconducting order, showing that robust Majorana-like zero modes may appear in a many-body system with no single-particle analogs.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Physics, Multidisciplinary
Vasilii Vadimov, Tapio Ala-Nissila, Mikko Mottonen
PHYSICAL REVIEW RESEARCH
(2020)
Article
Physics, Multidisciplinary
S. Alipour, A. T. Rezakhani, A. P. Babu, K. Molmer, M. Mottonen, T. Ala-Nissila
Article
Materials Science, Multidisciplinary
Hao Hsu, Matti Silveri, Andras Gunyho, Jan Goetz, Gianluigi Catelani, Mikko Mottonen