Stabilization and control of Majorana bound states with skyrmions (Conference Presentation)

Spintronics X ◽  
2017 ◽  
Author(s):  
Alexey A. Kovalev
Keyword(s):  
Bound States ◽  
Majorana Bound States ◽  
And Control

scholarly journals Skyrmion control of Majorana states in planar Josephson junctions

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Narayan Mohanta ◽  
Satoshi Okamoto ◽  
Elbio Dagotto
Keyword(s):  
Josephson Junctions ◽  
Bound States ◽  
Spin Orbit Coupling ◽  
Majorana Bound States ◽  
Rashba Spin ◽  
Dimensional Electron Gas ◽  
And Control ◽  
Zero Phase ◽  
Additional Phase ◽  
Topological Superconductivity

AbstractPlanar Josephson junctions provide a versatile platform, alternative to the nanowire-based geometry, for the generation of the Majorana bound states, due to the additional phase tunability of the topological superconductivity. The proximity induction of chiral magnetism and superconductivity in a two-dimensional electron gas showed remarkable promise to manipulate topological superconductivity. Here, we consider a Josephson junction involving a skyrmion crystal and show that the chiral magnetism of the skyrmions can create and control the Majorana bound states without the requirement of an intrinsic Rashba spin-orbit coupling. Interestingly, the Majorana bound states in our geometry are realized robustly at zero phase difference at the junction. The skyrmion radius, being externally tunable by a magnetic field or a magnetic anisotropy, brings a unique control feature for the Majorana bound states.

scholarly journals Skyrmion Control of Majorana States in Planar Josephson Junctions

2021 ◽  
Author(s):  
Narayan Mohanta ◽  
Satoshi Okamoto ◽  
Elbio Dagotto
Keyword(s):  
Josephson Junctions ◽  
Bound States ◽  
Spin Orbit Coupling ◽  
Majorana Bound States ◽  
Rashba Spin ◽  
Dimensional Electron Gas ◽  
And Control ◽  
Zero Phase ◽  
Additional Phase ◽  
Topological Superconductivity

Abstract Planar Josephson junctions provide a versatile platform, alternative to the nanowire-based geometry, for the generation of the Majorana bound states, due to the additional phase tunability of the topological superconductivity. The proximity induction of chiral magnetism and superconductivity in a two-dimensional electron gas showed remarkable promises to manipulate topological superconductivity. Here, we consider a Josephson junction involving a skyrmion crystal and show that the chiral magnetism of the skyrmions can create and control the Majorana bound states without the requirement of an intrinsic Rashba spin-orbit coupling. Interestingly, the Majorana bound states in our geometry are realized robustly at zero phase difference at the junction. The skyrmion radius, being externally tunable by a magnetic field or a magnetic anisotropy, brings a unique control feature for the Majorana bound states.

scholarly journals Stabilization and control of Majorana bound states with elongated skyrmions

2018 ◽  
Vol 97 (11) ◽  
Author(s):  
Utkan Güngördü ◽  
Shane Sandhoefner ◽  
Alexey A. Kovalev
Keyword(s):  
Bound States ◽  
Majorana Bound States ◽  
And Control

scholarly journals Topological isoconductance signatures in Majorana nanowires

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
L. S. Ricco ◽  
J. E. Sanches ◽  
Y. Marques ◽  
M. de Souza ◽  
M. S. Figueira ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Transport Properties ◽  
Spin Polarization ◽  
Bound States ◽  
Spin Asymmetry ◽  
Experimental Protocol ◽  
Zero Bias ◽  
Topological Superconductor ◽  
Hybrid Device ◽  
Majorana Bound States

AbstractWe consider transport properties of a hybrid device composed by a quantum dot placed between normal and superconducting reservoirs, and coupled to a Majorana nanowire: a topological superconducting segment hosting Majorana bound states (MBSs) at the opposite ends. It is demonstrated that if highly nonlocal and nonoverlapping MBSs are formed in the system, the zero-bias Andreev conductance through the dot exhibits characteristic isoconductance profiles with the shape depending on the spin asymmetry of the coupling between the dot and the topological superconductor. Otherwise, for overlapping MBSs with less degree of nonlocality, the conductance is insensitive to the spin polarization and the isoconductance signatures disappear. This allows to propose an alternative experimental protocol for probing the nonlocality of the MBSs in Majorana nanowires.

scholarly journals Majorana Bound States Hallmarks in a Quantum Topological Interferometer Ring

2021 ◽  
pp. 2100040
Author(s):  
Ana M. Calle ◽  
Pedro A. Orellana ◽  
Jorge A. Otálora
Keyword(s):  
Bound States ◽  
Majorana Bound States

Odd–Even Effect of the Persistent Current in a Quantum Dot Ring with Embedded Majorana Bound States

2015 ◽  
Vol 84 (2) ◽  
pp. 024707 ◽  
Author(s):  
Wei-Jiang Gong ◽  
Ying Zhao ◽  
Zhen Gao ◽  
Guangyu Yi ◽  
Xin Zhang
Keyword(s):  
Quantum Dot ◽  
Bound States ◽  
Persistent Current ◽  
Majorana Bound States

scholarly journals Assessing Bound States in a One-Dimensional Topological Superconductor: Majorana versus Tamm

2021 ◽  
Author(s):  
Niccolò Traverso Ziani ◽  
Lucia Vigliotti ◽  
Matteo Carrega ◽  
Fabio Cavaliere
Keyword(s):  
Quantum Computation ◽  
Bound States ◽  
Research Activity ◽  
One Dimensional ◽  
Majorana Bound States ◽  
Topological Superconductors ◽  
Topological Quantum ◽  
Tamm State ◽  
Topological Quantum Computation ◽  
Intense Research

Majorana bound states in topological superconductors have attracted intense research activity in view of applications in topological quantum computation. However, they are not the only example of topological bound states that can occur in such systems. We here study a model in which both Majorana and Tamm bound states compete. We show both numerically and analytically that, surprisingly, the Tamm state remains partially localized even when the spectrum becomes gapless. Despite this fact, we demonstrate that the Majorana polarization shows a clear transition between the two regimes.

scholarly journals Photon-Assisted Transport Through a Quantum Dot Side-Coupled to Majorana Bound States

2020 ◽  
Vol 8 ◽  
Author(s):  
Feng Chi ◽  
Tian-Yu He ◽  
Jing Wang ◽  
Zhen-Guo Fu ◽  
Li-Ming Liu ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Bound States ◽  
Majorana Bound States
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