Article
Optics
Y. Cao, T. F. Xu
Summary: We investigated the nonlinear Landau-Zener tunneling with higher-order dispersion and used a two-mode approximation to transform the Gross-Pitaevskii (GP) equation with higher-order dispersion terms into a nonlinear two-energy level form. We performed a comprehensive analysis on the loop structure of the lowest-energy band and the nonlinear Landau-Zener tunneling. Our results showed that the energy band structure exhibits spatial inversion symmetry breaking and unbalanced Landau-Zener tunneling when the third-order dispersion coefficient is non-zero. We also studied the real-time evolution of solitons with transverse bias and observed the tunneling phenomenon. Furthermore, we found that adjusting the dispersion term can effectively control optical tunneling, which presents an alternative idea for optical switching.
Article
Physics, Multidisciplinary
Haoxin Zhou, Chunli Huang, Nemin Wei, Takashi Taniguchi, Kenji Watanabe, Michael P. Zaletel, Zlatko Papic, Allan H. MacDonald, Andrea F. Young
Summary: At high magnetic fields, monolayer graphene exhibits competing phases. Recent experiments have observed a special quantum Hall state that is related to the underlying isospin order. However, no direct evidence for this transition has been reported. This study measures the transmission of magnons in monolayer graphene and finds that transmission is controlled by density and restored in the antiferromagnetic regime. Additionally, a hidden phase transition between bulk insulating charge density wave and canted antiferromagnetic phase is directly detected.
Article
Optics
J. Ramya Parkavi, V. K. Chandrasekar, M. Lakshmanan
Summary: This study investigates the stable Bloch oscillations and Landau-Zener tunneling in a non-Hermitian system exposed to external fields. Complex dispersive bands were found to be isolated in both flat-band and non-flat-band cases, potentially enabling Bloch oscillations induced by a synthetic electric field and leading to amplified Bloch oscillations for controlling transport phenomena in non-Hermitian systems.
Article
Chemistry, Multidisciplinary
Bong Joo Kang, David Rohrbach, Fabian D. J. Brunner, Salvatore Bagiante, Hans Sigg, Thomas Feurer
Summary: Researchers elucidate the details and timescales of mode switching in two-dimensional THz metamaterials consisting of metallic structures, and identify the dominant carrier generation mechanisms and dynamics.
Article
Engineering, Mechanical
Hong Cao
Summary: In this study, we investigate the effect of Rosen-Zener tunneling on Bose-Einstein condensates in a triple-well potential using mean-field treatment. We first calculate the tunneling dynamics exactly in the linear case and observe that all atoms are trapped in the initially populated well. However, the introduction of nonlinear interaction significantly changes the tunneling dynamics, breaking the symmetry and leading to the emergence of self-trapping solutions within a fixed interval.
NONLINEAR DYNAMICS
(2023)
Article
Materials Science, Multidisciplinary
Zhigang Wang, Zhen-Guo Fu, Ping Zhang, Wei Zhang
Summary: In this work, the nonlinear current response of Weyl semimetals to a strong dc-ac electric field in the ultraquantum regime with a strong magnetic field is studied. The results show that the nonlinear current response of Weyl semimetals can be modulated by ac fields, with interesting phenomena such as dynamic localization and quasienergy band collapse.
Review
Physics, Multidisciplinary
Oleh V. Ivakhnenko, Sergey N. Shevchenko, Franco Nori
Summary: This article systematically studies various aspects of LZSM physics and reviews the relevant literature, significantly expanding on the previous review article. The interfernce between transitions in LZSM has recently become accessible, controllable, and useful for manipulating a growing number of quantum systems.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Xin Wang, H. D. Liu, L. B. Fu
Summary: We study the non-Hermitian nonlinear Landau-Zener-Stuckelberg-Majorana (LZSM) interferometry in a non-Hermitian N-body interacting boson system with nonreciprocal tunnelings between the bosons. Using mean-field approximation and projective Hilbert space, we investigate the effect of nonreciprocity and nonlinearity on the energy spectrum, dynamics, and interference fringes formation. We also explore the impact of different symmetries and two types of reciprocity on the energy spectrum and phase transition.
NEW JOURNAL OF PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Xutao Wang, Ningning Liu, Yanfu Wu, Yueqiao Qu, Wenxuan Zhang, Jinyue Wang, Dandan Guan, Shiyong Wang, Hao Zheng, Yaoyi Li, Canhua Liu, Jinfeng Jia
Summary: Metal-intercalated bilayer graphene has a high density of states near the Fermi energy, and thus is expected to exhibit enhanced strong correlation effect and superconductivity. By using a scanning tunneling microscope, researchers observed the superconducting energy gap and diamagnetic response in Ca-intercalated bilayer graphene, revealing strong coupling superconductivity and an isotropic s-wave superconductor.
Article
Chemistry, Physical
Gregory Geneste
Summary: In most proton-conducting oxides, proton conductivity is mediated by a Grotthuss-like mechanism, involving transfers and reorientations of the proton. This study focuses on the reorientation step in barium zirconate and reveals a transition at around 220 K. The reorientation of the protonic defect is influenced by quantum effects and facilitated by specific lattice vibrations. At low temperatures, tunneling dominates, while at high temperatures, additional contributions from asymmetric transitions become dominant.
SOLID STATE IONICS
(2022)
Article
Optics
T. F. Xu, B. Y. Shen, C. Y. Zhou, Y. H. Liu
Summary: We studied the LZ transition probability between Bloch bands in BECs with PT-symmetric periodic potentials, finding that the imaginary part of PT potentials plays important roles in the LZ tunneling rates and the transition probabilities of higher Bloch bandgaps are usually larger than the lower band gaps.
Article
Physics, Multidisciplinary
Yi Zheng, Tongyue Sun, Shi-Jie Yang
Summary: We study an extended Creutz ladder system and observe topological phase transition through changes in topological invariants and pseudospin textures. We investigate Bloch oscillation on topological bands and find that at the phase transition point, the oscillation period doubles and the wave packet alternates between the two bands. The magnitude of pseudospin polarizations in Bloch oscillation provides a dynamic identification of the topological feature. We also explore the micromotion and non-adiabatic propagations of the Bloch wave packet, revealing small density oscillations beyond the description of Bloch oscillation and obtaining the transition probability of Landau-Zener tunneling at avoided band crossings. Our results offer a transparent framework to understand the properties of topological bands and Bloch wave dynamics.
Article
Physics, Multidisciplinary
Alisher Duspayev, Ansh Shah, Georg Raithel
Summary: This study investigates the nonadiabatic decay of metastable states on avoided crossings (MSACs) by solving the two-component Schrodinger equation in diabatic and adiabatic representations. The non-perturbative lifetime values found from three different methods agree well, validating the approaches used. The results show that as the adiabaticity parameter increases, the MSAC character transitions from marginally to highly stable with significantly longer lifetimes. The dependence of MSAC lifetime on the vibrational quantum number is also discussed.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
A. D. Kammogne, M. B. Kenmoe, L. C. Fai
Summary: The study reveals that at high frequencies, a microwave pulse opens multiple windows on interferograms to replicate the action of a radio-frequency signal. The radio-frequency drives the three-level system to experience multiple coherent destruction of tunneling, and these effects can be explained by invoking the rotating wave approximation and the Floquet theory.
Article
Engineering, Mechanical
G. Gatti, C. Svelto
Summary: This paper proposes a paradigm shift in designing nonlinear oscillators by exploiting nonlinearity to achieve linear behavior for engineering purposes. The study focuses on an elastic suspension system with four inclined springs, which has a strong geometric nonlinear stiffness characteristic. By wisely selecting design parameters, a tailored force-displacement characteristic can be attained, with a particular relationship among these parameters resulting in an overall linear behavior. The proposed configuration provides more freedom in device dimensioning compared to classical linear springs, and the potential advantage of linear elastic behavior with geometric nonlinear damping.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Correction
Chemistry, Physical
Jukka-Pekka Kaikkonen, Abhilash Thanniyil Sebastian, Patrik Laiho, Nan Wei, Marco Will, Yongping Liao, Esko I. Kauppinen, Pertti J. Hakonen
Summary: The article was originally published online without open access, but the author later opted for Open Choice and changed the copyright to Creative Commons Attribution 4.0 International License.
Article
Multidisciplinary Sciences
Z. B. Tan, A. Laitinen, N. S. Kirsanov, A. Galda, V. M. Vinokur, M. Haque, A. Savin, D. S. Golubev, G. B. Lesovik, P. J. Hakonen
Summary: The non-local Seebeck effect has been observed in a graphene-based Cooper pair splitting device, offering a potential tool for producing entangled electrons. This phenomenon arises from the interplay of non-local Cooper pair splitting and elastic co-tunneling in normal metal-superconductor-normal metal structures.
NATURE COMMUNICATIONS
(2021)
Editorial Material
Physics, Multidisciplinary
Pertti J. Hakonen, Edouard B. Sonin
Article
Multidisciplinary Sciences
Maciej Wiesner, Kristie Koski, Antti Laitinen, Juuso Manninen, Alexander A. Zyuzin, Pertti Hakonen
Summary: We investigated charge and heat transport in copper-intercalated topological insulator Bi2Se3 hybrid devices. Quantum corrections, electron-electron, and electron-phonon interactions were observed in the measured conductivity. Our shot noise measurements revealed a crossover in the heat flux between T-2 and T-4 as temperature increased, possibly due to inelastic electron scattering on disorder and the increased role of transverse acoustic phonons in the electron-phonon coupling process.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Multidisciplinary
M. T. Haque, M. Will, A. Zyuzin, D. Golubev, P. Hakonen
Summary: The coupling between graphene and superconducting resonator is studied, and thermal self-oscillations are observed under certain conditions. This is of great importance for evaluating the electron-phonon coupling in graphene samples.
NEW JOURNAL OF PHYSICS
(2022)
Article
Multidisciplinary Sciences
Hoon Hahn Yoon, Henry A. Fernandez, Fedor Nigmatulin, Weiwei Cai, Zongyin Vane, Hanxiao Cui, Faisal Ahmed, Xiaoqi Cui, Md Gius Uddin, Ethan D. Minot, Hard Lipsanen, Kwanpyo Kim, Pertti Hakonen, Tawfique Hasan, Zhipei Sun
Summary: This study presents a high-performance computational spectrometer based on a single van der Waals junction, which achieves high accuracy and resolution using an electrically tunable transport-mediated spectral response, providing unprecedented performance for miniaturized applications.
Article
Multidisciplinary Sciences
I Todoshchenko, M. Kamada, J-P Kaikkonen, Y. Liao, A. Savin, M. Will, E. Sergeicheva, T. S. Abhilash, E. Kauppinen, P. J. Hakonen
Summary: Low dimensional fermionic quantum systems have attracted great interest due to their unique physical phenomena. We have successfully confined He-3 on a carbon nanotube to form a 2-dimensional Fermi system and observed a quantum phase transition from 1/3 solid to an unknown, soft, and mobile solid phase.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
M. R. Perelshtein, K. V. Petrovnin, V. Vesterinen, S. Hamedani Raja, I. Lilja, M. Will, A. Savin, S. Simbierowicz, R. N. Jabdaraghi, J. S. Lehtinen, L. Groenberg, J. Hassel, M. P. Prunnila, J. Govenius, G. S. Paraoanu, P. J. Hakonen
Summary: Entangled microwave photons are a valuable resource for quantum information processing and sensing. In this study, we demonstrate the generation of frequency-entangled photons at a high rate using a low-loss Josephson metamaterial. Additionally, single-mode squeezing is achieved in such devices.
PHYSICAL REVIEW APPLIED
(2022)
Article
Chemistry, Multidisciplinary
Juuso Manninen, Antti Laitinen, Francesco Massel, Pertti Hakonen
Summary: In this work, we investigate the dynamics of a graphene Corbino disk supported by a gold mechanical resonator under the influence of a magnetic field. We find that our graphene/gold mechanical structure exhibits a nontrivial resonance frequency dependence on the applied magnetic field, which indicates the presence of the de Haas-van Alphen effect in the graphene Corbino disk. Our detection scheme, based on the mechanical resonances of the gold structure, is material-independent and can be used for dHvA measurements on any conducting 2D material. This scheme is expected to be a valuable tool for studying centrosymmetric transition metal dichalcogenide (TMD) crystals and exploring hidden magnetization and interaction effects.
Article
Physics, Condensed Matter
Nicole Kellner, Niklas Huettner, Marco Will, Pertti Hakonen, Andreas K. Huettel
Summary: This article discusses the optimization of superconducting coplanar waveguide resonator devices in microwave-optomechanical experiments involving carbon nanotubes. Two devices are built and tested step by step to analyze the impact of fabrication and geometry modification on their performance, and numerical simulations are used to further optimize the simplified circuit geometries.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Physics, Applied
Weijun Zeng, Kirsi Tappura, Masahiro Kamada, Antti Laitinen, Heikki Seppa, Pertti Hakonen
Summary: Recent experiments have shown that mobility fluctuations impact 1/f noise in two-dimensional conductors. This study investigates the second spectrum of noise caused by mobile impurities on a two-dimensional lattice through simulations and experiments. The simulations reveal a 1/f^d behavior with an exponent of d≈0.8±0.15, while the experiments on suspended graphene yield an exponent of d≈0.7±0.3, independent of the amount of adsorbed atoms.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Masahiro Kamada, Weijun Zeng, Antti Laitinen, Jayanta Sarkar, Sheng-Shiuan Yeh, Kirsi Tappura, Heikki Seppa, Pertti Hakonen
Summary: The authors investigate the sources of 1/f noise using a suspended graphene Corbino device and provide evidence that mobility fluctuations are an essential contributing factor. The work shows that the noise can be suppressed in a high-mobility graphene Corbino disk, indicating potential technological benefits for low noise 2D devices. The results suggest that the 1/f noise is induced by scattering of carriers on mobile impurities forming clusters.
COMMUNICATIONS PHYSICS
(2023)
Article
Quantum Science & Technology
Kirill Viktorovich Petrovnin, Michael Romanovich Perelshtein, Tero Korkalainen, Visa Vesterinen, Ilari Lilja, Gheorghe Sorin Paraoanu, Pertti Juhani Hakonen
Summary: In this work, the generation and control of genuine tripartite and quadripartite quantum entanglement states are achieved by utilizing the phase difference between pump tones. The study provides a comprehensive control toolbox for entanglement structures and enhances the prospects of quantum data processing using parametric microwave cavities.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Materials Science, Multidisciplinary
Juuso Manninen, Mohammad Tasnimul Haque, David Vitali, Pertti Hakonen
Summary: This article proposes a scheme to enhance the optomechanical coupling between microwave and mechanical resonators and describes the specific experimental setup and operation. By adjusting certain parameters, different coupling effects can be achieved, thereby expanding the application range of optomechanical coupling technology.
Article
Materials Science, Multidisciplinary
Matti Tomi, Mikhail R. Samatov, Andrey S. Vasenko, Antti Laitinen, Pertti Hakonen, Dmitry S. Golubev
Summary: The study investigates the current-voltage characteristic of a highly transparent Josephson junction caused by the transition of superconducting leads to the normal state. By fabricating two different structures of Josephson junctions, the researchers confirmed the theory predictions and demonstrated the temperature dependence of heat flow out of the junction.
