Article
Multidisciplinary Sciences
Guanzhong Wang, Tom Dvir, Grzegorz P. Mazur, Chun-Xiao Liu, Nick van Loo, Sebastiaan L. D. ten Haaf, Alberto Bordin, Sasa Gazibegovic, Ghada Badawy, Erik P. A. M. Bakkers, Michael Wimmer, Leo P. Kouwenhoven
Summary: In most naturally occurring superconductors, electrons with opposite spins form Cooper pairs. However, materials with intrinsic p-wave superconductivity, where Cooper pairs are made of equal-spin electrons, have not been identified. Instead, engineered platforms involving s-wave superconductors in contact with magnetic materials have shown evidence of equal-spin pairing. In this study, equal-spin pairing between spin-polarized quantum dots was directly measured, indicating the proximity-induced effect from an s-wave superconductor into a semiconducting nanowire with strong spin-orbit interaction. The results demonstrate controllable detection of singlet and triplet pairing between the quantum dots, which is important for realizing an artificial Kitaev chain.
Article
Physics, Multidisciplinary
Antti Ranni, Elsa T. Mannila, Axel Eriksson, Dmitry S. Golubev, Jukka P. Pekola, Ville F. Maisi
Summary: This study measures the rates and coupling coefficients for local Andreev, nonlocal Andreev, and elastic cotunneling processes. The findings show that the nonlocal Andreev process, responsible for Cooper pair splitting, has the same coupling coefficient as the elastic cotunneling process, while the local Andreev process is more than 2 orders of magnitude stronger than the corresponding nonlocal process. Theoretical estimates explain the large difference in coupling between the nonlocal and local processes, which arises from the competition between electron diffusion in the superconductor and tunnel junction transparency.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Condensed Matter
Jong Hak An, Kum Hyok Jong
Summary: In this study, we investigate the optimal output power and efficiency of a thermoelectric device induced by Cooper pair splitting (CPS). CPS, with its unique properties such as injecting additional electrons into the Quantum Dots system, has been considered as a promising candidate for a quantum heat engine. The coexistence of elastic cotunnelling process with CPS and various parameters including temperature difference, bias voltage, and Coulomb interaction affect the performance of the heat engine. We use a genetic algorithm to illustrate the parametric dependence of output power and efficiency and determine the optimal performance of this CPS-based heat engine.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Multidisciplinary Sciences
Antti Ranni, Fredrik Brange, Elsa T. Mannila, Christian Flindt, Ville F. Maisi
Summary: Detecting the splitting of Cooper pairs in superconductors has been a challenge, but in this study, the authors successfully observed the real-time splitting of individual Cooper pairs in a superconducting device. By overcoming the challenge of accessing split Cooper pairs, the researchers were able to statistically analyze the correlation arising from two-electron processes with significant results. This breakthrough offers new possibilities for experiments involving the spin-entanglement of split Cooper pairs.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Zoltan Scherubl, Gergo Fulop, Jorg Gramich, Andras Palyi, Christian Schonenberger, Jesper Nygard, Szabolcs Csonka
Summary: Cooper pair splitting (CPS) is a method to create spatially separated, entangled electron pairs. In this study, the spatial current correlations are experimentally characterized by tuning the tunnel barrier strength between the quantum dot and the neighboring electrode, revealing the competition between CPS and nonlocal probing of the Shiba state.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Nanoscience & Nanotechnology
Dmitry S. Golubev, Andrei D. Zaikin
Summary: This paper theoretically investigates the non-trivial behavior of cross-correlated non-local shot noise in the presence of a temperature gradient. It suggests that applying a temperature gradient may serve as an extra tool to control the phenomenon of Cooper pair splitting.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Feng-Rong Shi
Summary: This paper investigates the quantum transport properties in a double-quantum-dot circuit with two laterally-coupled superconductors. The results show that the characteristics of electron tunneling and local and crossed Andreev reflections vary with the adjustment of the phase difference between the superconductors. Moreover, appropriate phase differences can enhance crossed Andreev reflection and suppress local Andreev reflection and electron tunneling.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Physics, Multidisciplinary
Fredrik Brange, Kacper Prech, Christian Flindt
Summary: This paper proposes a dynamic Cooper pair splitter that generates noiseless and regular flow of spin-entangled electrons by adjusting the energy levels of quantum dots and coupling them to a superconductor. The optimal operating conditions are identified to ensure exactly one Cooper pair split per external drive period, leading to noiseless flow of entangled electrons. Characterization of the regularity of the Cooper pair splitter is performed in the time domain through analysis of g(2) function of output currents and distribution of waiting times between split Cooper pairs.
PHYSICAL REVIEW LETTERS
(2021)
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)
Article
Physics, Multidisciplinary
P. Pandey, R. Danneau, D. Beckmann
Summary: The experimental study of a Cooper pair splitter based on ballistic graphene multi-terminal junctions showed clear signatures of Cooper pair splitting in both local and nonlocal electronic transport measurements. The experimental data can be well described by the beam splitter model, opening up possibilities for designing new entangled state detection experiments using ballistic Cooper pair splitters.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Ji-Yin Wang, Constantin Schrade, Vukan Levajac, David van Driel, Kongyi Li, Sasa Gazibegovic, Ghada Badawy, Roy L. M. Op Het Veld, Joon Sue Lee, Mihir Pendharkar, Connor P. Dempsey, Chris J. Palmstrom, Erik P. A. M. Bakkers, Liang Fu, Leo P. Kouwenhoven, Jie Shen
Summary: This study investigates a Cooper pair transistor implemented by two Josephson weak links in a nanowire. The results show that the nanowire, under the influence of a magnetic field, can create isolated subgap levels in a superconducting island, facilitating a supercurrent through coherent cotunneling of Cooper pairs. The observed phase offset of the supercurrent allows for the discrimination of even and odd charge ground states on the superconducting island, with the potential for parity measurements of subgap states.
Article
Physics, Multidisciplinary
Alexander Wietek
Summary: This study investigates the properties of the superconducting ground state in a two-dimensional model with striped superconductivity, and finds that fragmented condensates occur in the presence of charge density modulations. These fragmented condensates, located on the stripes, hybridize to form an extended macroscopic wave function.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Nicholas R. Poniatowski, Jonathan B. Curtis, Charlotte G. L. Bottcher, Victor M. Galitski, Amir Yacoby, Prineha Narang, Eugene Demler
Summary: We study the electrodynamics of spin triplet superconductors with dipolar interactions. We identify a class of spin waves that originate from the coupled dynamics of the spin-symmetry breaking triplet order parameter and the electromagnetic field. We specifically study magnetostatic spin wave modes localized to the sample surface, which can be excited and detected using experimental techniques.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Banabir Pal, Anirban Chakraborty, Pranava K. Sivakumar, Margarita Davydova, Ajesh K. Gopi, Avanindra K. Pandeya, Jonas A. Krieger, Yang Zhang, Mihir Date, Sailong Ju, Noah Yuan, Niels B. M. Schroeter, Liang Fu, Stuart S. P. Parkin
Summary: This study reports the discovery of a giant Josephson diode effect in Josephson junctions formed from a type-II Dirac semimetal, NiTe2. The distinguishing feature of this effect is the asymmetry in the critical current, which depends on the magnitude and direction of an applied magnetic field and achieves its maximum value when the magnetic field is perpendicular to the current and is of the order of just 10 mT. These characteristic features can be explained by a model based on finite-momentum Cooper pairing that largely originates from the Zeeman shift of spin-helical topological surface states.
Article
Materials Science, Multidisciplinary
Siddhartha Patra, Siddhartha Lal
Summary: This study presents a microscopic derivation of the Cooper-pair insulator (CPI) and reveals its topologically ordered nature through a generalized model of electrons with attractive interactions. The CPI effective Hamiltonian displays characteristics of topological order, with a fourfold degeneracy in the ground-state manifold. The long-ranged many-particle entanglement content of the CPI ground state is shown to be driven by interhelicity two-particle scattering processes.
Article
Physics, Applied
M. S. Anwar, M. Veldhorst, A. Brinkman, J. Aarts
APPLIED PHYSICS LETTERS
(2012)
Article
Physics, Applied
M. Veldhorst, C. G. Molenaar, X. L. Wang, H. Hilgenkamp, A. Brinkman
APPLIED PHYSICS LETTERS
(2012)
Article
Chemistry, Physical
M. Veldhorst, M. Snelder, M. Hoek, T. Gang, V. K. Guduru, X. L. Wang, U. Zeitler, W. G. van der Wiel, A. A. Golubov, H. Hilgenkamp, A. Brinkman
Review
Materials Science, Multidisciplinary
M. Veldhorst, M. Snelder, M. Hoek, C. G. Molenaar, D. P. Leusink, A. A. Golubov, H. Hilgenkamp, A. Brinkman
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2013)
Article
Materials Science, Multidisciplinary
M. van Zalk, M. Veldhorst, A. Brinkman, J. Aarts, H. Hilgenkamp
Article
Materials Science, Multidisciplinary
M. Veldhorst, C. G. Molenaar, C. J. M. Verwijs, H. Hilgenkamp, A. Brinkman
Article
Materials Science, Multidisciplinary
M. Snelder, M. Veldhorst, A. A. Golubov, A. Brinkman
Article
Physics, Applied
Ke Chen, Menno Veldhorst, Che-Hui Lee, Daniel R. Lamborn, Raymond DeFrain, Joan M. Redwing, Qi Li, X. X. Xi
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2008)
