Article
Chemistry, Physical
Mandun Fu, Minjiang Dan, Gongwei Hu, Lijie Li, Yan Zhang
Summary: The study demonstrates the Rashba spin-orbit interaction (RSOI) modulated by stress-induced polarization field in ZnO/CdO quantum well (QW), showing significant manipulation of conduction electrons and potential for strong manipulation of spin qubits. The peak of RSOI coefficient can reach up to approximately 83 meV.nm, which is almost three orders of magnitude higher than conventional GaAs-based QWs, stimulating interest in low-dimensional quantum piezotronic devices.
Article
Physics, Multidisciplinary
Pavel Kokhanchik, Dmitry Solnyshkov, Thilo Stoeferle, Barbara Pietka, Jacek Szczytko, Guillaume Malpuech
Summary: We theoretically demonstrate that Rashba-Dresselhaus spin-orbit coupling acts as a synthetic gauge field in lattices. This allows us to control the tunneling coefficients between sites and implement topological Hamiltonians and spin lattices useful for simulations and optimization. We propose a realistic scheme using liquid crystal-based microcavities to realize these concepts.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Condensed Matter
Priyanka, Rinku Sharma, Manoj Kumar
Summary: This study investigates the impact of external electric field, magnetic field, Rashba spin-orbit interaction, and Aluminium concentration on the energy dispersion and conductivity in a Ga1-xAlxAs quantum wire. The results show that these parameters significantly affect the energy spectra and conductivity.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Quantum Science & Technology
Michael Berger, Jamal Berakdar
Summary: Quantum states of systems with classical chaotic dynamics can be scarred, and this study demonstrates how the scarred state can be imaged to a region that does not support scarring. This phantom scar has a significant impact on the spin-dependent system dynamics, as shown by explicit calculations for fidelity and correlation functions. Numerical simulations and analysis for the spin-dependent electron dynamics in semiconductor-based double quantum dots provide insights into the coherent phenomenon of scarring and its localization properties in a narrow spectral window.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Physics, Applied
Yash Gupta, Pranay Khosla, Sakshi Arora, Rinku Priyanka
Summary: This paper presents a comprehensive examination of the thermodynamic properties of a cylindrical cone-shaped GaAs quantum dot under the influence of electric and magnetic fields, as well as the Rashba spin-orbit interaction. The study investigates the mean energy, heat capacity, free energy, entropy, and magnetocaloric effect, and explores their relationships with temperature, magnetic field, and the Rashba spin-orbit interaction parameter. The findings reveal the behavior of these thermodynamic quantities in the system and provide insights into the underlying physics of quantum systems.
JOURNAL OF LOW TEMPERATURE PHYSICS
(2023)
Article
Physics, Applied
Yash Gupta, Pranay Khosla, Sakshi Arora, Rinku Priyanka, Rinku Sharma
Summary: This paper thoroughly examines the thermodynamic properties of a cylindrical cone-shaped GaAs quantum dot under the influence of electric and magnetic fields, as well as the Rashba spin-orbit interaction. The study investigates thermodynamic characteristics such as mean energy, heat capacity, free energy, entropy, and magnetocaloric effect. The eigenenergies of the system are derived by solving the one-particle time-independent Schrodinger equation. The results reveal the relationship between these properties and temperature, magnetic field, and Rashba spin-orbit interaction parameter. The study provides insight into the behavior of the thermodynamic quantities in the system and contributes to a better understanding of the physics of quantum systems.
JOURNAL OF LOW TEMPERATURE PHYSICS
(2023)
Article
Multidisciplinary Sciences
Chi Ming Yim, Dibyashree Chakraborti, Luke C. Rhodes, Seunghyun Khim, Andrew P. Mackenzie, Peter Wahl
Summary: Exploiting inversion symmetry breaking in systems with strong spin-orbit coupling allows for spin control through electric fields, requiring specific conditions for a two-dimensional electron gas. Recent studies have shown a large Rashba spin splitting on the transition metal oxide terminations, indicating a different orbital effect that raises questions about quasiparticle scattering. The spin-orbital selection rules relevant for conventional Rashba systems are demonstrated to be true spin selection rules in this correlated electron liquid, with the spin coherence length determined through quasiparticle interference imaging.
Article
Multidisciplinary Sciences
Sara Varotto, Annika Johansson, Boerge Goebel, Luis M. Vicente-Arche, Srijani Mallik, Julien Brehin, Raphael Salazar, Francois Bertran, Patrick Le Fevre, Nicolas Bergeal, Julien Rault, Ingrid Mertig, Manuel Bibes
Summary: Rashba interfaces have shown potential as platforms for spin-charge interconversion. We used angle resolved photoemission spectroscopy to investigate KTaO3 two-dimensional electron gases and observed their Rashba-split bands. Our calculations revealed complex spin and orbital textures, as well as interconversion efficiencies exceeding those of other oxide two-dimensional electron gases.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
J. Jahangiri, M. Abbasi, S. Mahdavifar
Summary: In this study, quantum correlations (QCs) are used as powerful tools to detect quantum critical points. The ground-state phase diagram of a one-dimensional spin-1/2 XXZ model is reexamined using QCs, revealing different values for different phases.
CHINESE JOURNAL OF PHYSICS
(2023)
Article
Physics, Multidisciplinary
Xiao Yuan, P. S. Riseborough
Summary: The article discusses the field-dependent enhancement of Rashba spin-orbit splitting and highlights the crucial role of strong Coulomb correlations in enhancing spin-orbit coupling.
Article
Physics, Multidisciplinary
A. R. Zainagutdinov, A. Telezhnikov, G. M. Maksimova
Summary: This study investigates the energy spectra and persistent currents in one-dimensional quantum rings with inhomogeneous spin-orbit Rashba interaction (RSOI) in the presence of Aharonov-Bohm magnetic flux. It is found that the suppression of RSOI in certain parts of the ring leads to level anticrossing, resulting in the smoothing of the magnetic flux dependence of the charge persistent current. For a periodic ring structure with alternating RSOI and non-RSOI segments, the energy levels are grouped into gap-separated subbands. The flux dependence of the charge persistent current in such a ring exhibits a sawtooth shape, except when multiple subbands are completely filled by electrons, where the dependence becomes smooth. The study also calculates the persistent spin current and shows that its density's angular dependence satisfies certain symmetry conditions determined by the structure period and the angular width of its non-RSOI part.
Article
Chemistry, Multidisciplinary
Ruixiang Fei, Shuaiqin Yu, Yan Lu, Linghan Zhu, Li Yang
Summary: The study explores an efficient method of spin-light conversion in ferroelectric materials through spin-orbit interactions and demonstrates this concept through first-principles simulations. The photoinduced spin current is about two orders of magnitude larger than the charge photocurrent, and can be conveniently switched by inverting the spin textures.
Article
Physics, Multidisciplinary
Yun Yen, Cheng-Li Chin, Ping-Hui Lin, Raman Sankar, Tien-Ming Chuang, Guang-Yu Guo
Summary: Dirac semimetals, like ZrSiS, exhibit unique quantum phenomena and have potential applications. ZrGeTe, a member of the ZrSiS family with stronger spin-orbit coupling, shows Dirac line nodes and floating gapless surface states with Rashba spin-split helical spin texture. This study highlights the effects of large SOC on the electronic structure of ZrGeTe and its potential for future use in exotic quantum states.
NEW JOURNAL OF PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Yao Lu, Risto Ojajarvi, P. Virtanen, M. A. Silaev, Tero T. Heikkila
Summary: We demonstrate that the Higgs mode and spin dynamics can couple together in superconductors with a static spin-splitting field and Rashba spin-orbit coupling. This coupling greatly modifies the spin susceptibility near the superconducting critical temperature and enhances the spin pumping effect in a ferromagnetic insulator/superconductor bilayer system. We also show that this effect can be detected by measuring the magnon transmission rate and the magnon-induced voltage through the inverse spin Hall effect.
Article
Materials Science, Multidisciplinary
Lucila Peralta Gavensky, Gonzalo Usaj, C. A. Balseiro
Summary: This work theoretically studies the transverse magnetic focusing in a two-dimensional electron gas with strong Rashba spin-orbit interaction when proximitized with a superconducting contact along its edge. It shows the emergence of chiral Andreev edge states in the presence of superconducting correlations, which exhibit semiclassical skipping orbits in a weak magnetic field regime. The results demonstrate an enhancement of the spin-split focal points separation, which scales linearly with the number of Andreev scattering events at the anomalous terminal, by calculating conductance maps to arbitrary points in the sample.
Article
Biochemistry & Molecular Biology
Miguel A. Sierra, David Sanchez, Rafael Gutierrez, Gianaurelio Cuniberti, Francisco Dominguez-Adame, Elena Diaz
Editorial Material
Physics, Multidisciplinary
David Sanchez, Michael Moskalets
Article
Physics, Multidisciplinary
S. Mojtaba Tabatabaei, David Sanchez, Alfredo Levy Yeyati, Rafael Sanchez
PHYSICAL REVIEW LETTERS
(2020)
Article
Nanoscience & Nanotechnology
Javier Osca, Kristof Moors, Bart Soree, Llorenc Serra
Summary: Three-dimensional topological insulator nanowires exhibit remarkable magnetotransport properties, with the ability to control interference patterns through tuning carrier density and length of gated sections. External magnetic fields and transverse asymmetry also play a role in influencing transport properties of the nanowires, showing similarities with other types of nanowires.
Article
Physics, Multidisciplinary
Nassima Benchtaber, David Sanchez, Llorenc Serra
Summary: This study investigates the electronic confinement in bilayer graphene using topological loops of different shapes. The spectrum of large-area loops can be described by a quantization rule based on the loop perimeter, while the spectrum of small loops depends on their shape. Zero-energy states exhibit a distinct pattern that is strongly influenced by spatial symmetry.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Condensed Matter
Nassima Benchtaber, David Sanchez, Llorenc Serra
Summary: Two types of confinement in bilayer graphene by top and bottom gating with symmetrical microelectrodes, trivial confinement and topological confinement, are discussed and compared. The main qualitative difference between the two confinement types is shown in the magnetic field dependence, with explicit calculations illustrating the findings. Trivial confinement shows degenerate Landau bands with a non-centered gap, while topological confinement shows a sequence of state branches always crossing zero energy without a field-induced gap.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Multidisciplinary Sciences
Sungguen Ryu, Rosa Lopez, Llorenc Serra, David Sanchez
Summary: This study demonstrates that a periodically driven quantum chiral conductor can exhibit efficiencies beyond the Carnot limit while the second law of thermodynamics is preserved.
NATURE COMMUNICATIONS
(2022)
Article
Mathematics, Interdisciplinary Applications
Juan De Gregorio, David Sanchez, Raul Toral
Summary: In this study, we investigate the memory properties of discrete sequences composed of a finite number of states. We find that the memory of systems modeled as arbitrary finite order Markov chains can be reliably determined using block entropy. Additionally, we propose an entropy estimator that accurately estimates memory even in the presence of correlations. We validate our findings by calculating the memory of daily precipitation series at different locations, and our results are consistent with existing methods while being applicable in undersampled regimes and independent of model selection.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Mathematics, Applied
David Sanchez, Luciano Zunino, Juan De Gregorio, Raul Toral, Claudio Mirasso
Summary: Words are fundamental linguistic units that are connected through meaning and syntactic rules. By analyzing the statistical connections between words using an ordinal pattern approach, we discovered unique pattern distributions for different languages. These pattern distributions can be used to determine the historical period and author of a text. Our findings highlight the significance of ordinal time series analysis in linguistic typology, historical linguistics, and stylometry.
Article
Humanities, Multidisciplinary
Thomas Louf, Bruno Goncalves, Jose J. Ramasco, David Sanchez, Jack Grieve
Summary: Cultural areas are important in understanding human behavior and attitudes towards different issues. However, the process of selecting common traits that define a cultural area is somewhat arbitrary. This study introduces a method to infer cultural regions based on the analysis of large datasets from microblogging posts. The method identifies regional variations in written discourse by analyzing geotagged tweets and clustering the data to uncover clear cultural areas and the topics of discussion that define them.
HUMANITIES & SOCIAL SCIENCES COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Sun-Yong Hwang, Bjorn Sothmann, David Sanchez
Summary: We propose a refrigeration scheme for a mesoscopic superconductor-quantum dot hybrid device that can significantly cool down a normal metal coupled to it by applying a bias voltage. The cooling power can reach up to 0.05A20/h where A0 is the absolute value of the superconducting order parameter. Unlike previous proposals, our device operates without any magnetic elements and can be optimized by tuning system parameters. Our theory determines the temperature drop of the normal reservoir in the nonlinear transport regime and achieves efficiencies close to half of the Carnot bound.
Article
Mathematics, Applied
Pablo Rosillo-Rodes, Maxi San Miguel, David Sanchez
Summary: Language shift is common in multilingual societies. Language ideologies play a crucial role in understanding language usage and attitudes. Speaker preferences are found to be significant in language shift, and the degree of interaction between individuals with opposing preferences also affects the process.
Article
Materials Science, Multidisciplinary
S. Mojtaba Tabatabaei, David Sanchez, Alfredo Levy Yeyati, Rafael Sanchez
Summary: We discuss a quantum thermal machine that generates power from a thermally driven double quantum dot coupled to normal and superconducting reservoirs. Energy exchange between the dots is mediated by electron-electron interactions. We find that the heat engine efficiency increases with increasing coupling to the superconducting reservoir. The presence of the superconducting gap and the strong energy dependence of the electronic density of states around the gap edges contribute to large efficiencies. The competition between Andreev processes and quasiparticle tunneling is observed in the system. Our results emphasize the importance of both pair tunneling and structured band spectrum for an accurate characterization of the heat engine properties in normal-superconducting coupled dot systems.
Article
Physics, Multidisciplinary
Thomas Louf, David Sanchez, Jose J. Ramasco
Summary: The cultural diversity encoded within languages is at risk due to globalization leading to language extinction. Understanding the driving factors of language extinction and mechanisms for coexistence is crucial. Large-scale empirical analysis reveals diverse spatial patterns of language coexistence, and the importance of history in understanding the present state of languages.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Nassima Benchtaber, David Sanchez, Llorenc Serra
Summary: Research shows that local kink-antikink potentials applied to gapped bilayer graphene can modulate scattering of topological currents, resulting in anomalous steps in junction conductance, and forming a loop can reveal the system's energy spectrum. Additionally, these kink-antikink devices can function as valley filters with tiny magnetic fields by tuning a central gate.