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
Lina G. Johnsen, Haakon T. Simensen, Arne Brataas, Jacob Linder
Summary: At the interface between a ferromagnetic insulator and a superconductor, a coupling between the spins of the two materials results in the induction of a magnon spin current in the adjacent ferromagnetic insulator by a supercurrent carried by triplet Cooper pairs. This effect is dominated by Cooper pairs polarized in the same direction as the ferromagnetic insulator, showing that charge and spin supercurrents produce similar results in this system. This study demonstrates a method of converting Cooper pair supercurrents into magnon spin currents.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Bogdan R. Bulka
Summary: Exact analytical formulas for currents and current correlation functions in a Cooper pair splitter system are derived using Keldysh Green functions, with a focus on noise power spectrum behavior across bias voltage range. In the large voltage limit, shot noise dominates with spectrum exhibiting extraordinary side dips related to resonant interlevel current correlations. The study also shows perfect entanglement of split electrons in two separated crossed Andreev reflection processes.
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
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
Grzegorz Michalek, Bogdan R. Bulka
Summary: This study investigates electron entanglement through current-current correlations in two Cooper pair splitter devices, one with one quantum dot (1QD) and another with two quantum dots (2QD), under various Coulomb interactions and weak coupling with metallic electrodes. The analysis reveals bunching and antibunching effects of split particles, highlighting positive inter-level components and negative intra-level components between electron and hole currents flowing to different electrodes, as well as the presence of low-frequency polarization fluctuations in current cross-correlations.
NEW JOURNAL OF PHYSICS
(2021)
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
Materials Science, Multidisciplinary
Shu-Ichiro Suzuki, Takumi Sato, Yasuhiro Asano
Summary: The Yu-Shiba-Rusinov (YSR) state, a bound state of a quasiparticle at a magnetic atom in a superconductor, is discussed. The YSR state is shown to have energy below the superconducting gap and the pair potential changes sign at the magnetic atom. The conversion of spin-singlet s-wave Cooper pairs into odd-frequency Cooper pairs by the magnetic atom, and the coexistence of odd-frequency pairing correlations with the YSR states below the gap, are explained.
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
W. C. Smith, M. Villiers, A. Marquet, J. Palomo, M. R. Delbecq, T. Kontos, P. Campagne-Ibarcq, B. Doucot, Z. Leghtas
Summary: This work demonstrates that pairing Cooper pairs magnifies the phase fluctuations of the circuit ground state, providing evidence for the suppression of circuit flux sensitivity and revealing a delocalized state of the ground state across several Josephson wells.
Article
Physics, Multidisciplinary
Matthew Rogers, Alistair Walton, Machiel G. Flokstra, Fatma Al Ma'Mari, Rhea Stewart, Stephen L. Lee, Thomas Prokscha, Andrew J. Caruana, Christian J. Kinane, Sean Langridge, Harry Bradshaw, Timothy Moorsom, Mannan Ali, Gavin Burnell, Bryan J. Hickey, Oscar Cespedes
Summary: The combination of magnetic molecules with a metallic substrate allows for the manipulation of molecular spin properties and potential application in low-power information storage devices. Research demonstrates the feasibility of achieving spin-ordering and superconducting properties at the metallo-molecular interface, enabling lower energy spin transfer and magnetic switching in quantum computing and information storage. The results showcase the potential of metallo-molecular interfaces for singlet to triplet Cooper pair conversion, offering a new capability for generating and controlling the diffusion of spin polarized dissipationless currents.
COMMUNICATIONS PHYSICS
(2021)
Article
Physics, Multidisciplinary
Shlomi Bouscher, Dmitry Panna, Krishna Balasubramanian, Shimon Cohen, Dan Ritter, Alex Hayat
Summary: Enhanced Andreev reflection is demonstrated in a Nb/InGaAs/InP-based superconductor-semiconductor hybrid device, resulting in increased Cooper-pair injection efficiency by Cooper-pair tunneling into a semiconductor quantum well resonant state.
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
Multidisciplinary Sciences
Xiaolong Liu, Yi Xue Chong, Rahul Sharma, J. C. Seamus Davis
Summary: The study found the presence of pair density wave (PDW) states in transition-metal dichalcogenides, which linearly couple to the preexisting charge density wave (CDW) state and exhibit a phase difference, possibly due to the Cooper-pair wave function orbital content.
Article
Education, Scientific Disciplines
Raphael Leone, Thierry Gourieux
EUROPEAN JOURNAL OF PHYSICS
(2015)
Article
Education, Scientific Disciplines
Raphael Leone, Fernando Haas
EUROPEAN JOURNAL OF PHYSICS
(2017)
Article
Physics, Condensed Matter
R. Leone, A. Monjou
CONDENSED MATTER PHYSICS
(2013)
Article
Physics, Multidisciplinary
Raphael Leone
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2011)
Article
Materials Science, Multidisciplinary
Raphael Leone, Laurent Levy
Article
Education, Scientific Disciplines
Thierry Gourieux, Raphael Leone
Summary: This article focuses on the importance of the Rund-Trautman function in classical mechanics, showing its relation to symmetry and conservation laws. By analyzing the connection between 'almost' symmetry and 'almost' constants of motion, as well as its application in the adiabatic context, the significance of the Rund-Trautman function is demonstrated.
EUROPEAN JOURNAL OF PHYSICS
(2021)