Article
Physics, Multidisciplinary
Sankar Das Sarma
Summary: Majorana particles, which are the same as their antiparticles, show promise for quantum computing in condensed matter systems. This article discusses the search for Majorana modes in semiconductor heterostructures and the limitations imposed by disorder. Majorana zero modes are emergent phenomena in topological superconductors, and this Perspective provides an overview of their physics, recent experimental progress, and future outlook for success.
Article
Multidisciplinary Sciences
Alexandre Huguet, Kacper Wrzesniewski, Ireneusz Weymann
Summary: The impact of spin effects on the nonequilibrium transport properties of a nanowire hosting Majorana zero-energy modes at its ends is examined. The study investigates the current, differential conductance, and current cross-correlations using the real-time diagrammatic technique. Results show that the presence of Majorana quasiparticles gives rise to unique features in all spin-resolved transport characteristics and is reflected in the current cross-correlations. The dependence of these features on various system parameters and the magnetic configuration of the system is also studied.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Applied
Benjamin D. Woods, Sankar Das Sarma, Tudor D. Stanescu
Summary: This study addresses the quantitative characterization of disorder effects in semiconductor-superconductor hybrid structures for the development of Majorana-based topological qubits. By developing a microscopic theory, the research provides insights into the impact of charge impurities on the physics of the hybrid structure and offers a clear direction for experimental progress, including specific material quality and semiconductor purity targets that must be achieved.
PHYSICAL REVIEW APPLIED
(2021)
Article
Materials Science, Multidisciplinary
Guo-Jian Qiao, Sheng-Wen Li, C. P. Sun
Summary: This article investigates the topological phase diagram of hybrid semiconductor-superconductor nanowires and provides a more precise constraint on the magnetic field strength for the emergence of Majorana zero modes. The prediction is confirmed by quantum transport calculations, which also provide the accessible magnetic field range for experimental searching of Majorana zero modes.
Article
Multidisciplinary Sciences
R. Nakajima, D. Hirobe, G. Kawaguchi, Y. Nabei, T. Sato, T. Narushima, H. Okamoto, H. M. Yamamoto
Summary: Chiral molecules exhibit spin-selective charge emission, which is called chirality-induced spin selectivity. Despite being made of light elements, their spin polarization can exceed that of typical ferromagnets. This has potential applications in the chiral spintronics field. Through magnetoresistance measurements, we observed the two suggested phenomena, effective enhancement of spin-orbit interactions and chirality represented by oppositely polarized spins, in an organic chiral superconductor. Our findings provide insights into the origin of spin selectivity in chiral molecules and contribute to the development of superconducting spintronics research.
Article
Materials Science, Multidisciplinary
A. Banerjee, O. Lesser, M. A. Rahman, H. -R. Wang, M. -R. Li, A. Kringhoj, A. M. Whiticar, A. C. C. Drachmann, C. Thomas, T. Wang, M. J. Manfra, E. Berg, Y. Oreg, Ady Stern, C. M. Marcus
Summary: A growing body of work shows that planar Josephson junctions made from superconducting hybrid materials offer a highly controllable path to one-dimensional topological superconductivity. Experimental controls include in-plane magnetic field, phase difference across the junction, and carrier density set by gate voltages. Researchers investigate wide planar Josephson junctions based on an epitaxial InAs/Al heterostructure, embedded in a superconducting loop, probed with integrated quantum point contacts (QPCs) at both ends of the junction. They observe a closing and reopening of the superconducting gap for a large range of gate voltages, with a stronger correlation at the two ends of the junction. The reopening occurs around an in-plane magnetic field of approximately 0.2 T, is uniform across multiple devices, and can be tuned with phase bias.
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
Chemistry, Physical
M. Perovic, M. Boskovic, V Kusigerski, Z. Jaglicic, J. Blanusa, V Spasojevic, N. Pizurova, O. Schneeweiss
Summary: This study confirms the magnetic memory effects in super spin glass magnetite nanoparticles can be observed up to 200K, and demonstrates the procedures of writing and reading digital information in such a material.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Multidisciplinary Sciences
Chun-Guang Chu, Jing-Jing Chen, An-Qi Wang, Zhen-Bing Tan, Cai-Zhen Li, Chuan Li, Alexander Brinkman, Peng-Zhan Xiang, Na Li, Zhen-Cun Pan, Hai-Zhou Lu, Dapeng Yu, Zhi-Min Liao
Summary: We report the observation of broad edge supercurrent in Dirac semimetal Cd3As2-based Josephson junctions. The wide and large edge supercurrent, as well as the nonlocality, suggest the presence of non-Hermitian skin effect. The interplay between band topology and non-Hermiticity is beneficial for exploiting exotic topological matter.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Chun-Guang Chu, Jing-Jing Chen, An-Qi Wang, Zhen-Bing Tan, Cai-Zhen Li, Chuan Li, Alexander Brinkman, Peng-Zhan Xiang, Na Li, Zhen-Cun Pan, Hai-Zhou Lu, Dapeng Yu, Zhi-Min Liao
Summary: In this study, broad edge supercurrent is observed in Dirac semimetal Cd3As2-based Josephson junctions, indicating the presence of non-Hermitian skin effect. The wide and large edge supercurrent, as well as the observed supercurrent nonlocality, suggest the interplay between band topology and non-Hermiticity in exploiting exotic topological matter.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Chun-Xiao Liu, Haining Pan, F. Setiawan, Michael Wimmer, Jay D. Sau
Summary: In this work, we propose a protocol for detecting the Majorana fusion rules in an artificial Kitaev chain and discuss the effects of realistic imperfections on the fusion outcomes. We also propose a fermion parity readout scheme and highlight the significance of these results for future experiments on detecting the non-Abelian properties of Majorana modes in a quantum dot chain.
Article
Physics, Applied
A. Vettoliere, R. Satariano, R. Ferraiuolo, L. Di Palma, H. G. Ahmad, G. Ausanio, G. P. Pepe, F. Tafuri, D. Montemurro, C. Granata, L. Parlato, D. Massarotti
Summary: This study reports on the fabrication and characterization of high-quality tunnel ferromagnetic Josephson junctions, demonstrating their typical transport properties in hysteric magnetic field patterns and low dissipation. The proposed technology provides a potential alternative for the implementation of Al tunnel-ferromagnetic JJs in superconducting quantum circuits.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Multidisciplinary
Riku Tuovinen
Summary: In this study, electron-correlation effects in one-dimensional nanowires were investigated using a novel method, revealing their impact on the topological superconducting phase and transient features of zero-energy Majorana states when subjected to external perturbations. These effects were found to play a crucial role in understanding the behavior of topological superconductivity in nanowires.
NEW JOURNAL OF PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Yi-Hua Lai, Sankar Das Sarma, Jay D. Sau
Summary: Despite recent progress in experimental observations of large zero-bias conductance peaks, it is still unclear whether Majorana modes have been observed. The existing experimental works lack stability of the putative Majorana mode features, indicating the absence of a topological phase. This paper introduces a dimensionless quality factor F to quantify the robustness of the zero-bias conductance peak height and proposes specific experimentally accessible measures for analyzing the stability of the observed peaks. The results show that Majorana modes are significantly more robust compared to nontopological peaks in the low-temperature limit and suggest that the quality factor F can be used to estimate the quality of topological qubits made from Majorana modes.
Article
Materials Science, Multidisciplinary
Haining Pan, Sankar Das Sarma
Summary: Motivated by recent experiments, this study proposes an alternative mechanism through theoretical simulations to explain the generation of large zero-bias conductance peaks in Majorana nanowires. The mechanism includes three conditions: strong potential disorder in the nanowire bulk, suppression of disorder near the wire ends, and low tunnel barrier strength. These conditions are often satisfied in experiments, thereby explaining the observed large zero-bias conductance peaks.
Article
Physics, Nuclear
B. Blank, N. Adimi, M. Alcorta, A. Bey, M. J. G. Borge, B. A. Brown, F. de Oliveira Santos, C. Dossat, H. O. U. Fynbo, J. Giovinazzo, H. H. Knudsen, M. Madurga, A. Magilligan, I. Matea, A. Perea, K. Suemmerer, O. Tengblad, J. C. Thomas
Summary: In an experiment conducted at the SPIRAL1 facility of GANIL, the beta decay of Ar-32 was studied using the Silicon Cube device and germanium clover detectors. The observed beta-delayed protons and gamma rays allowed for the determination of decay branches. The comparison of Gamow-Teller strength distribution to shell model calculations showed excellent agreement, with the Fermi strength meeting expectations. The experiment established a quasi-complete decay scheme of Ar-32.
EUROPEAN PHYSICAL JOURNAL A
(2021)
Review
Physics, Nuclear
V. Girard-Alcindor, I. Stefan, F. de Oliveira Santos, O. Sorlin, D. Ackermann, P. Adsley, J. C. Angelique, M. Assie, M. Assuncao, D. Beaumel, E. Berthoumieux, R. Borcea, L. Caceres, I. Celikovic, M. Ciemala, V. Chudoba, G. D'Agata, F. de Grancey, G. Dumitru, F. Flavigny, C. Fougeres, S. Franchoo, A. Georgiadou, N. Goyal, S. Grevy, J. Guillot, V. Guimaraes, F. Hammache, O. Kamalou, J. Kiener, S. Koyama, L. Lalanne, V. Lapoux, I. Matea, A. Matta, A. Meyer, N. Michel, P. Morfouace, J. Mrazek, F. Negoita, M. Niikura, D. Pantelica, L. Perrot, C. Petrone, J. Piot, C. Portail, T. Roger, F. Rotaru, A. M. Sanchez Benitez, N. de Sereville, M. Stanoiu, C. Stodel, K. Subotic, D. Suzuki, V. Tatischeff, J. C. Thomas, P. Ujic, D. Verney
Summary: The unbound proton-rich nuclei F-16 and F-15 were investigated experimentally and theoretically. An asymmetry between these nuclei and their mirror nuclei was observed, with a significant modification in the nucleon-nucleon effective interaction involving the loosely bound proton. Various explanations were proposed to interpret the differences in the interactions between different pairs of nuclei.
EUROPEAN PHYSICAL JOURNAL A
(2021)
Article
Physics, Nuclear
M. Ciemala, S. Ziliani, F. C. L. Crespi, S. Leoni, B. Fornal, A. Maj, P. Bednarczyk, G. Benzoni, A. Bracco, C. Boiano, S. Bottoni, S. Brambilla, M. Bast, M. Beckers, T. Braunroth, F. Camera, N. Cieplicka-Orynczak, E. Clement, S. Coelli, O. Dorvaux, S. Erturk, G. De France, C. Fransen, A. Goldkuhle, J. Grebosz, M. N. Harakeh, L. W. Iskra, B. Jacquot, A. Karpov, M. Kicinska-Habior, Y. -H. Kim, M. Kmiecik, A. Lemasson, S. M. Lenzi, M. Lewitowicz, H. Li, I. Matea, K. Mazurek, C. Michelagnoli, M. Matejska-Minda, B. Million, C. Mueller-Gatermann, V. Nanal, P. Napiorkowski, D. R. Napoli, R. Palit, M. Rejmund, Ch. Schmitt, M. Stanoiu, I. Stefan, E. Vardaci, B. Wasilewska, O. Wieland, M. Zieblinski, M. Zielinska
Summary: A novel Monte Carlo technique has been developed to determine lifetimes of excited states in low-energy heavy-ion binary reactions, with validation in neutron-rich nuclei. The method relies on detailed analysis of Doppler-broadened gamma-ray lineshapes and utilizes gamma-tracking arrays for unprecedented position resolution.
EUROPEAN PHYSICAL JOURNAL A
(2021)
Article
Astronomy & Astrophysics
B. Le Crom, M. Assie, Y. Blumenfeld, J. Guillot, H. Sagawa, T. Suzuki, M. Honma, N. L. Achouri, B. Bastin, R. Borcea, W. N. Catford, E. Clement, L. Caceres, M. Caamano, A. Corsi, G. De France, F. Delaunay, N. De Sereville, B. Fernandez-Dominguez, M. Fisichella, S. Franchoo, A. Georgiadou, J. Gibelin, A. Gillibert, F. Hammache, O. Kamalou, A. Knapton, V Lapoux, S. Leblond, A. O. Macchiavelli, F. M. Marques, A. Matta, L. Menager, P. Morfouace, N. A. Orr, J. Pancin, X. Pereira-Lopez, L. Perrot, J. Piot, E. Pollacco, D. Ramos, T. Roger, F. Rotaru, A. M. Sanchez-Benitez, M. Senoville, O. Sorlin, M. Stanoiu, I Stefan, C. Stodel, D. Suzuki, J-C Thomas, M. Vandebrouck
Summary: The isovector and isoscalar components of neutron-proton pairing in the fp-shell of N=Z unstable nuclei were investigated using the (p, He-3) two-nucleon transfer reaction. By combining particle and gamma-ray detection with radioactive beams, the study was carried out for the first time in both closed and open-shell nuclei in the fp-shell. The results suggest the presence of a superfluid phase in the isovector channel based on the enhanced ground-state to ground-state pair transfer cross-section in Fe-52.
Article
Astronomy & Astrophysics
S. Giraud, L. Canete, B. Bastin, A. Kankainen, A. F. Fantina, F. Gulminelli, P. Ascher, T. Eronen, V Girard-Alcindor, A. Jokinen, A. Khanam, I. D. Moore, D. A. Nesterenko, F. de Oliveira Santos, H. Penttila, C. Petrone, I Pohjalainen, A. De Roubin, V. A. Rubchenya, M. Vilen, J. Aysto
Summary: This study reports the first high-precision mass measurements of neutron-rich nuclei Ni-74, Ni-75, and the ground state of Cu-76 using the double Penning trap JYFLTRAP at the Ion Guide Isotope Separator On-Line (IGISOL) facility. The results lead to a quantitative estimation of the quenching for the N = 50 neutron shell gap. The impact of this shell quenching on core-collapse supernova dynamics is tested using a statistical equilibrium approach.
Article
Physics, Multidisciplinary
L. Lalanne, O. Sorlin, A. Poves, M. Assie, F. Hammache, S. Koyama, D. Suzuki, F. Flavigny, V. Girard-Alcindor, A. Lemasson, A. Matta, T. Roger, D. Beaumel, Y. Blumenfeld, B. A. Brown, F. . De Oliveira Santos, F. Delaunay, N. de Sereville, S. Franchoo, J. Gibelin, J. Guillot, O. Kamalou, N. Kitamura, V. Lapoux, B. Mauss, P. Morfouace, J. Pancin, T. Y. Saito, C. Stodel, J-C. Thomas
Summary: The last proton bound calcium isotope 35Ca has been studied for the first time, revealing its mass and energy state information. The study shows that 36Ca is a doubly magic nucleus with a N=16 shell gap similar to 24O.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Nuclear
V. Girard-Alcindor, A. Mercenne, I. Stefan, F. de Oliveira Santos, N. Michel, M. Ploszajczak, M. Assic, A. Lemasson, E. Clement, F. Flavigny, A. Matta, D. Ramos, M. Rejmund, J. Dudouet, D. Ackermann, P. Adsley, M. Assuncao, B. Bastin, D. Beaumel, G. Benzoni, R. Borcea, A. J. Boston, D. Brugnara, L. Caceres, B. Cederwall, I. Celikovic, V. Chudoba, M. Ciemala, J. Collado, F. C. L. Crespi, G. D'Agata, G. De France, F. Delaunay, C. Diget, C. Domingo-Pardo, J. Eberth, C. Fougeres, S. Franchoo, F. Galtarossa, A. Georgiadou, J. Gibelin, S. Giraud, V. Gonzalez, N. Goyal, A. Gottardo, J. Goupil, S. Grevy, V. Guimaraes, F. Hammache, L. J. Harkness-Brennan, H. Hess, N. Jovancevic, D. S. Judson Oliver, O. Kamalou, A. Kamenyero, J. Kiener, W. Korten, S. Koyama, M. Labiche, L. Lalanne, V. Lapoux, S. Leblond, A. Lefevre, C. Lenain, S. Leoni, H. Li, A. Lopez-Martens, A. Maj, I. Matea, R. Menegazzo, D. Mengoni, A. Meyer, B. Million, B. Monteagudo, P. Morfouace, J. Mrazek, M. Niikura, J. Piot, Zs. Podolyak, C. Portail, A. Pullia, B. Quintana, F. Recchia, P. Reiter, K. Rezynkina, T. Roger, J. S. Rojo, F. Rotaru, M. D. Salsac, A. M. Sanchez Benitez, E. Sanchis, M. Senyigit, N. de Sereville, M. Siciliano, J. Simpson, D. Sohler, O. Sorlin, M. Stanoiu, C. Stodel, D. Suzuki, C. Theisen, D. Thisse, J. C. Thomas, P. Ujic, J. J. Valiente-Dobon, M. Zielinska
Summary: The structure of the unbound F-15 nucleus was investigated by using radioactive O-14 beam and analyzing the corresponding reactions. This study confirmed the previously observed levels and discovered new resonances in F-15 nucleus. The analysis suggested that the wave functions of these resonances may be collectivized by coupling to nearby decay channels.
Article
Physics, Nuclear
M. Holl, S. Lindberg, A. Heinz, Y. Kondo, T. Nakamura, J. A. Tostevin, H. Wang, T. Nilsson, N. L. Achouri, H. Al Falou, L. Atar, T. Aumann, H. Baba, K. Boretzky, C. Caesar, D. Calvet, H. Chae, N. Chiga, A. Corsi, H. L. Crawford, F. Delaunay, A. Delbart, Q. Deshayes, P. Diaz Fernandez, Z. Dombradi, C. A. Douma, Z. Elekes, P. Fallon, I Gasparic, J-M Gheller, J. Gibelin, A. Gillibert, M. N. Harakeh, A. Hirayama, C. R. Hoffman, A. Horvat, A. Horvath, J. W. Hwang, T. Isobe, J. Kahlbow, N. Kalantar-Nayestanaki, S. Kawase, S. Kim, K. Kisamori, T. Kobayashi, D. Koerper, S. Koyama, I Kuti, V Lapoux, F. M. Marques, S. Masuoka, J. Mayer, K. Miki, T. Murakami, M. Najafi, K. Nakano, N. Nakatsuka, A. Obertelli, F. de Oliveira Santos, N. A. Orr, H. Otsu, T. Ozaki, V Panin, S. Paschalis, A. Revel, D. Rossi, A. T. Saito, T. Y. Saito, M. Sasano, H. Sato, Y. Satou, H. Scheit, F. Schindler, P. Schrock, M. Shikata, Y. Shimizu, H. Simon, D. Sohler, O. Sorlin, L. Stuhl, S. Takeuchi, M. Tanaka, M. Thoennessen, H. Toernqvist, Y. Togano, T. Tomai, J. Tscheuschner, J. Tsubota, T. Uesaka, Z. Yang, M. Yasuda, K. Yoneda
Summary: In this study, the unbound states of Ne-29 were investigated for the first time. Through analyzing resonance properties, partial cross sections, and momentum distributions, some important conclusions were drawn, including the first evidence for f(7/2) single particle strength in Ne-29.
Article
Physics, Nuclear
D. S. Harrouz, N. de Sereville, P. Adsley, F. Hammache, R. Longland, B. Bastin, T. Faestermann, R. Hertenberger, M. La Cognata, L. Lamia, A. Meyer, S. Palmerini, R. G. Pizzone, S. Romano, A. Tumino, H-F Wirth
Summary: This study aims to determine the proton widths of unbound 31P states in order to evaluate the thermonuclear 30Si(p, gamma)31P reaction rate. Several unbound states of 31P have been observed for the first time, and the reaction rate uncertainty from other resonances has been reduced. However, the unknown 149 keV resonance still contributes to the remaining uncertainty in the reaction rate.
Article
Physics, Nuclear
B. M. Nyako, J. Timar, M. Csatlos, Zs Dombradi, A. J. Krasznahorkay, I Kuti, D. Sohler, T. G. Tornyi, M. Czerwinski, T. Rzaca-Urban, W. Urban, L. Atanasova, D. L. Balabanski, K. Sieja, A. Blanc, G. de France, M. Jentschel, U. Koster, P. Mutti, G. S. Simpson, T. Soldner, C. A. Ur
Summary: Excited states of the neutron-rich 89Br have been observed for the first time through cold neutron induced fission of 235U. The level structure appears similar to that of 87Br, which was confirmed by large valence space shell model calculations. Comparing the observed π g9/2 band with the results of the shell model calculations provides insights into the evolution of collectivity in this region.
Article
Physics, Nuclear
S. Bottoni, N. Cieplicka-Orynczak, S. Leoni, B. Fornal, G. Colo, P. F. Bortignon, G. Bocchi, D. Bazzacco, G. Benzoni, A. Blanc, A. Bracco, S. Ceruti, F. C. L. Crespi, G. de France, E. R. Gamba, L. W. Iskra, M. Jentschel, U. Koster, C. Michelagnoli, B. Million, D. Mengoni, P. Mutti, Y. Niu, C. Porzio, G. Simpson, T. Soldner, B. Szpak, A. Tuerler, C. A. Ur, W. Urban
Summary: Recent research focused on the structure of Ca-41, Ca-47, and Ca-49 nuclei, exploring their gamma decay and level schemes through cold-neutron-capture reactions. Experimental data were analyzed with gamma-ray coincidence relationships, leading to the identification of new transitions and transition multipolarities. Results suggest coexistence of different excitations and couplings in the low-spin states of these nuclei.
Article
Physics, Nuclear
J. E. Riley, A. M. Laird, N. de Sereville, A. Parikh, S. P. Fox, F. Hammache, I Stefan, P. Adsley, M. Assie, B. Bastin, F. Boulay, A. Coc, S. Franchoo, R. Garg, S. A. Gillespie, V Guimaraes, C. Hamadache, N. Hubbard, J. Kiener, A. Lefebvre-Schuhl, F. de Oliveira Santos, A. Remadi, L. Perrot, D. Suzuki, G. Verde, V Tatischeff, M. Williams
Summary: This study aimed to clarify the existence and nature of sub-threshold Ne-19 states in the F-18(p, alpha) O-15 reaction rate. Experimental results from the F-19(He-3, t) Ne-19 charge-exchange reaction revealed a high-spin and low-spin doublet component, shedding light on the uncertainties in the reaction rate.
