scholarly journals Orbital tunable 0−π transitions in Josephson junctions with noncentrosymmetric topological superconductors

2020 ◽  
Vol 102 (14) ◽  
Author(s):  
Yuri Fukaya ◽  
Keiji Yada ◽  
Yukio Tanaka ◽  
Paola Gentile ◽  
Mario Cuoco
Keyword(s):  
Josephson Junctions ◽  
Topological Superconductors

scholarly journals Topological Josephson heat engine

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Benedikt Scharf ◽  
Alessandro Braggio ◽  
Elia Strambini ◽  
Francesco Giazotto ◽  
Ewelina M. Hankiewicz
Keyword(s):  
Josephson Junctions ◽  
Characteristic Property ◽  
Fault Tolerant ◽  
Heat Engine ◽  
Thermodynamic Cycle ◽  
Stirling Cycle ◽  
Topological Superconductors ◽  
Complementary Approach ◽  
Potential Applications ◽  
Fundamental Research

Abstract Topological superconductors represent a fruitful playing ground for fundamental research as well as for potential applications in fault-tolerant quantum computing. Especially Josephson junctions based on topological superconductors remain intensely studied, both theoretically and experimentally. The characteristic property of these junctions is their 4π-periodic ground-state fermion parity in the superconducting phase difference. Using such topological Josephson junctions, we introduce the concept of a topological Josephson heat engine. We discuss how this engine can be implemented as a Josephson–Stirling cycle in topological superconductors, thereby illustrating the potential of the intriguing and fruitful marriage between topology and coherent thermodynamics. It is shown that the Josephson–Stirling cycle constitutes a highly versatile thermodynamic machine with different modes of operation controlled by the cycle temperatures. Finally, the thermodynamic cycle reflects the hallmark 4π-periodicity of topological Josephson junctions and could therefore be envisioned as a complementary approach to test topological superconductivity.

scholarly journals Spectral response of Josephson junctions with low-energy quasiparticles

2019 ◽  
Vol 7 (4) ◽  
Author(s):  
Anna Keselman ◽  
Chaitanya Murthy ◽  
Bernard van Heck ◽  
Bela Bauer
Keyword(s):  
Josephson Junctions ◽  
Spectral Response ◽  
Low Energy ◽  
Superconducting Qubits ◽  
Experimental Investigations ◽  
Matrix Product ◽  
Perturbative Approach ◽  
Topological Superconductors ◽  
Matrix Product State ◽  
Conventional Models

We study nanowire-based Josephson junctions shunted by a capacitor and take into account the presence of low-energy quasiparticle excitations. These are treated by extending conventional models used to describe superconducting qubits to include the coherent coupling between fermionic quasiparticles, in particular the Majorana zero modes that emerge in topological superconductors, and the plasma mode of the junction. Using accurate, unbiased matrix-product state techniques, we compute the energy spectrum and response function of the system across the topological phase transition. Furthermore, we develop a perturbative approach, valid in the harmonic limit with small charging energy, illustrating how the presence of low-energy quasiparticles affects the spectrum and response of the junction. Our results are of direct interest to on-going experimental investigations of nanowire-based superconducting qubits.

Low-Tcramp-type Josephson junctions for SQUIDS

2002 ◽  
Vol 12 (3) ◽  
pp. 133-136 ◽  
Author(s):  
M. Podt ◽  
B. G.A. Rolink ◽  
J. Flokstra ◽  
H. Regalia
Keyword(s):  
Josephson Junctions

Application of silicon substrates for high-Tc Josephson junctions and SQUIDs

1998 ◽  
Vol 08 (PR3) ◽  
pp. Pr3-297-Pr3-300 ◽  
Author(s):  
S. Linzen ◽  
Y. J. Tian ◽  
U. Hübner ◽  
F. Schmidl ◽  
J. Scherbel ◽  
...  
Keyword(s):  
Josephson Junctions ◽  
Silicon Substrates ◽  
High Tc
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