scholarly journals Flux-induced topological superconductivity in full-shell nanowires

Science ◽  
2020 ◽  
Vol 367 (6485) ◽  
pp. eaav3392 ◽  
Author(s):  
S. Vaitiekėnas ◽  
G. W. Winkler ◽  
B. van Heck ◽  
T. Karzig ◽  
M.-T. Deng ◽  
...  
Keyword(s):  
Coulomb Blockade ◽  
Energy State ◽  
Topological Phase ◽  
Flux Quantum ◽  
Zero Energy ◽  
Zero Modes ◽  
The Core ◽  
Majorana Modes ◽  
Zero Phase ◽  
Topological Superconductivity

Hybrid semiconductor-superconductor nanowires have emerged as a promising platform for realizing topological superconductivity (TSC). Here, we present a route to TSC using magnetic flux applied to a full superconducting shell surrounding a semiconducting nanowire core. Tunneling into the core reveals a hard induced gap near zero applied flux, corresponding to zero phase winding, and a gapped region with a discrete zero-energy state around one applied flux quantum, corresponding to 2π phase winding. Theoretical analysis indicates that the winding of the superconducting phase can induce a transition to a topological phase supporting Majorana zero modes. Measured Coulomb blockade peak spacing around one flux quantum shows a length dependence that is consistent with the existence of Majorana modes at the ends of the nanowire.

scholarly journals Topological superconductivity with deformable magnetic skyrmions

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Maxime Garnier ◽  
Andrej Mesaros ◽  
Pascal Simon
Keyword(s):  
Zero Mode ◽  
Flat Band ◽  
Relevant Parameter ◽  
Spin Orbit Coupling ◽  
Scaling Properties ◽  
Zero Modes ◽  
The Core ◽  
Majorana Modes ◽  
Magnetic Skyrmions ◽  
Topological Superconductivity

Abstract Magnetic skyrmions are nanoscale spin configurations that are efficiently created and manipulated. They hold great promises for next-generation spintronics applications. In parallel, the interplay of magnetism, superconductivity and spin-orbit coupling has proved to be a versatile platform for engineering topological superconductivity predicted to host non-abelian excitations, Majorana zero modes. We show that topological superconductivity can be induced by proximitizing skyrmions and conventional superconductors, without need for additional ingredients. Apart from a previously reported Majorana zero mode in the core of the skyrmion, we find a more universal chiral band of Majorana modes on the edge of the skyrmion. We show that the chiral Majorana band is effectively flat in the physically relevant parameter regime, leading to interesting robustness and scaling properties. In particular, the number of Majorana modes in the (nearly-)flat band scales with the perimeter length of the system, while being robust to local disorder.

scholarly journals Topological phase transition between a normal insulator and a topological metal state in a quasi-one-dimensional system

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Milad Jangjan ◽  
Mir Vahid Hosseini
Keyword(s):  
Phase Transition ◽  
Dimensional System ◽  
Inversion Symmetry ◽  
Topological Phase ◽  
Edge States ◽  
Zero Energy ◽  
One Dimensional ◽  
Topological Phase Transition ◽  
Metal State ◽  
Topological Metal

AbstractWe theoretically report the finding of a new kind of topological phase transition between a normal insulator and a topological metal state where the closing-reopening of bandgap is accompanied by passing the Fermi level through an additional band. The resulting nontrivial topological metal phase is characterized by stable zero-energy localized edge states that exist within the full gapless bulk states. Such states living on a quasi-one-dimensional system with three sublattices per unit cell are protected by hidden inversion symmetry. While other required symmetries such as chiral, particle-hole, or full inversion symmetry are absent in the system.

scholarly journals Entanglement and Disordered-Enhanced Topological Phase in the Kitaev Chain

Universe ◽  
2019 ◽  
Vol 5 (1) ◽  
pp. 33 ◽  
Author(s):  
Liron Levy ◽  
Moshe Goldstein
Keyword(s):  
Phase Diagram ◽  
Information Theory ◽  
Quantum Information ◽  
Critical Point ◽  
Entanglement Entropy ◽  
Quantum Information Theory ◽  
Topological Phase ◽  
Many Body ◽  
Zero Modes ◽  
Many Body Systems

In recent years, tools from quantum information theory have become indispensable in characterizing many-body systems. In this work, we employ measures of entanglement to study the interplay between disorder and the topological phase in 1D systems of the Kitaev type, which can host Majorana end modes at their edges. We find that the entanglement entropy may actually increase as a result of disorder, and identify the origin of this behavior in the appearance of an infinite-disorder critical point. We also employ the entanglement spectrum to accurately determine the phase diagram of the system, and find that disorder may enhance the topological phase, and lead to the appearance of Majorana zero modes in systems whose clean version is trivial.

scholarly journals Zero-Energy State in Graphene in a High Magnetic Field

2008 ◽  
Vol 100 (20) ◽  
Author(s):  
Joseph G. Checkelsky ◽  
Lu Li ◽  
N. P. Ong
Keyword(s):  
Magnetic Field ◽  
High Magnetic Field ◽  
Energy State ◽  
Zero Energy

scholarly journals Buddhism and quantum physics: Generality

2015 ◽  
Vol 3 (2) ◽  
pp. 221 ◽  
Author(s):  
Preecha Yupapin
Keyword(s):  
Quantum Physics ◽  
Energy State ◽  
Human Life ◽  
Zero Energy

<p>The generalized concept of Buddhism is presented in terms quantum physics, which can be used to practice and reach the noble human life, where the related Buddhism principles can be formulated by the quantum physics concept. This can lead to meet the well-known Buddhism practical states, where they are the contemplation and perception. Finally, the zero energy state (nirvana) can be achieved and realized, which is benefit to the un-limited brain performance condition and discussed.</p>

Influence of zero-energy state on tunneling magnetoresistance in ferromagnet/d-wave superconductor/ferromagnet tunnel junctions

2001 ◽  
Vol 352 (1-4) ◽  
pp. 203-206
Author(s):  
Nobukatsu Yoshida ◽  
Yukio Tanaka ◽  
Jun-ichiro Inoue ◽  
Satoshi Kashiwaya
Keyword(s):  
Tunnel Junctions ◽  
Energy State ◽  
Tunneling Magnetoresistance ◽  
Zero Energy ◽  
D Wave

scholarly journals Experimental signature of topological superconductivity and Majorana zero modes on β-Bi 2 Pd thin films

2017 ◽  
Vol 62 (12) ◽  
pp. 852-856 ◽  
Author(s):  
Yan-Feng Lv ◽  
Wen-Lin Wang ◽  
Yi-Min Zhang ◽  
Hao Ding ◽  
Wei Li ◽  
...  
Keyword(s):  
Thin Films ◽  
Zero Modes ◽  
Topological Superconductivity

scholarly journals Energy-Efficient Buildings, a step towards Sustainability in Pakistan

2019 ◽  
Vol 4 (4) ◽  
pp. 109-124
Author(s):  
Hashir Usman
Keyword(s):  
Renewable Energy ◽  
Energy Consumption ◽  
Thermal Comfort ◽  
Energy Efficient ◽  
Energy State ◽  
Renewable Energy Sources ◽  
Building Energy ◽  
Developed Countries ◽  
Zero Energy ◽  
The World

With every passing year, energy consumption in the world is increasing drastically. Most of the energy comes from fossil fuels which are also depleting in a fast manner. Buildings consume a significant amount of energy all over the world and the demand for energy is also increasing unremittingly in buildings. Developed countries are taking profound measures in order to make buildings energy efficient and sustainable by achieving nearly zero energy stage. Pakistan is facing a serious energy crisis from the past few decades. The building sector in Pakistan deserves special attention in this regard since the energy consumption in buildings in Pakistan is feverishly high. Many types of research have been carried out in Pakistan by the United Nations and Energy Department of Pakistan in order to devise applicable methods that not only provide thermal comfort to the occupants but also make a building energy efficient. Renewable energy also plays an important role in compensating building energy demands. It is easy to achieve nearly zero energy state in a good energy efficient building if it is coupled with renewable energy sources then it will make it self-sufficient in energy demand. A survey is also carried out to determine the thermal comfort of the occupants in different types of areas. Also, solar energy analysis is also taken into account to highlight the solar power potential in Pakistan. Several recommendations have also been suggested to implement energy efficiency measures in Pakistan.

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