scholarly journals In-plane magnetic field-driven symmetry breaking in topological insulator-based three-terminal junctions

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Jonas Kölzer ◽  
Kristof Moors ◽  
Abdur Rehman Jalil ◽  
Erik Zimmermann ◽  
Daniel Rosenbach ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Topological Insulator ◽  
Three Dimensional ◽  
Surface States ◽  
Output Terminal ◽  
Current Switch ◽  
Topological Quantum ◽  
Orbital Effect ◽  
Topological Surface ◽  
Topological Quantum Computation

AbstractTopological surface states of three-dimensional topological insulator nanoribbons and their distinct magnetoconductance properties are promising for topoelectronic applications and topological quantum computation. A crucial building block for nanoribbon-based circuits are three-terminal junctions. While the transport of topological surface states on a planar boundary is not directly affected by an in-plane magnetic field, the orbital effect cannot be neglected when the surface states are confined to the boundary of a nanoribbon geometry. Here, we report on the magnetotransport properties of such three-terminal junctions. We observe a dependence of the current on the in-plane magnetic field, with a distinct steering pattern of the surface state current towards a preferred output terminal for different magnetic field orientations. We demonstrate that this steering effect originates from the orbital effect, trapping the phase-coherent surface states in the different legs of the junction on opposite sides of the nanoribbon and breaking the left-right symmetry of the transmission across the junction. The reported magnetotransport properties demonstrate that an in-plane magnetic field is not only relevant but also very useful for the characterization and manipulation of transport in three-dimensional topological insulator nanoribbon-based junctions and circuits, acting as a topoelectric current switch.

scholarly journals Induced unconventional superconductivity on the surface states of Bi2Te3 topological insulator

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Sophie Charpentier ◽  
Luca Galletti ◽  
Gunta Kunakova ◽  
Riccardo Arpaia ◽  
Yuxin Song ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Topological Insulator ◽  
Quantum Interference ◽  
Order Parameter ◽  
Thermal Strain ◽  
Surface States ◽  
Field Pattern ◽  
Key Factors ◽  
Ordered Phases ◽  
Simultaneous Existence

Abstract Topological superconductivity is central to a variety of novel phenomena involving the interplay between topologically ordered phases and broken-symmetry states. The key ingredient is an unconventional order parameter, with an orbital component containing a chiral p x  + ip y wave term. Here we present phase-sensitive measurements, based on the quantum interference in nanoscale Josephson junctions, realized by using Bi2Te3 topological insulator. We demonstrate that the induced superconductivity is unconventional and consistent with a sign-changing order parameter, such as a chiral p x  + ip y component. The magnetic field pattern of the junctions shows a dip at zero externally applied magnetic field, which is an incontrovertible signature of the simultaneous existence of 0 and π coupling within the junction, inherent to a non trivial order parameter phase. The nano-textured morphology of the Bi2Te3 flakes, and the dramatic role played by thermal strain are the surprising key factors for the display of an unconventional induced order parameter.

Spin accumulation in topological insulator thin films—influence of bulk and topological surface states

2018 ◽  
Vol 51 (42) ◽  
pp. 425301
Author(s):  
Zhuo Bin Siu ◽  
Yi Wang ◽  
Hyunsoo Yang ◽  
Mansoor B A Jalil
Keyword(s):  
Thin Films ◽  
Topological Insulator ◽  
Surface States ◽  
Spin Accumulation ◽  
Topological Surface

QUANTUM COMPUTING WITH NON-ABELIAN QUASIPARTICLES

2007 ◽  
Vol 21 (08n09) ◽  
pp. 1372-1378 ◽  
Author(s):  
N. E. BONESTEEL ◽  
L. HORMOZI ◽  
G. ZIKOS ◽  
S. H. SIMON
Keyword(s):  
Dimensional Space ◽  
Quantum Hall ◽  
Three Dimensional ◽  
Fractional Quantum ◽  
Fractional Quantum Hall ◽  
Quantum Operations ◽  
Topological Quantum ◽  
Dimensional Space Time ◽  
Two Space Dimensions ◽  
Topological Quantum Computation

In topological quantum computation quantum information is stored in exotic states of matter which are intrinsically protected from decoherence, and quantum operations are carried out by dragging particle-like excitations (quasiparticles) around one another in two space dimensions. The resulting quasiparticle trajectories define world-lines in three dimensional space-time, and the corresponding quantum operations depend only on the topology of the braids formed by these world-lines. We describe recent work showing how to find braids which can be used to perform arbitrary quantum computations using a specific kind of quasiparticle (those described by the so-called Fibonacci anyon model) which are thought to exist in the experimentally observed ν = 12/5 fractional quantum Hall state.

scholarly journals Exceptional topological insulators

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
M. Michael Denner ◽  
Anastasiia Skurativska ◽  
Frank Schindler ◽  
Mark H. Fischer ◽  
Ronny Thomale ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Three Dimensional ◽  
Surface States ◽  
Exceptional Point ◽  
Weyl Semimetal ◽  
Complex Eigenvalues ◽  
Topological State ◽  
Single Sheet ◽  
Bulk Energy ◽  
State Of Matter

AbstractWe introduce the exceptional topological insulator (ETI), a non-Hermitian topological state of matter that features exotic non-Hermitian surface states which can only exist within the three-dimensional topological bulk embedding. We show how this phase can evolve from a Weyl semimetal or Hermitian three-dimensional topological insulator close to criticality when quasiparticles acquire a finite lifetime. The ETI does not require any symmetry to be stabilized. It is characterized by a bulk energy point gap, and exhibits robust surface states that cover the bulk gap as a single sheet of complex eigenvalues or with a single exceptional point. The ETI can be induced universally in gapless solid-state systems, thereby setting a paradigm for non-Hermitian topological matter.

Superlinear Photogalvanic Effects in ( Bi0.3Sb0.7)2 ( Te0.1Se0.9)3 : Probing Three-Dimensional Topological Insulator Surface States at Room Temperature

2021 ◽  
Vol 16 (6) ◽  
Author(s):  
S. N. Danilov ◽  
L. E. Golub ◽  
T. Mayer ◽  
A. Beer ◽  
S. Binder ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Room Temperature ◽  
Three Dimensional ◽  
Surface States ◽  
Insulator Surface

scholarly journals Studies on the origin of the interfacial superconductivity of Sb2Te3/Fe1+yTe heterostructures

2019 ◽  
Vol 117 (1) ◽  
pp. 221-227 ◽  
Author(s):  
Jing Liang ◽  
Yu Jun Zhang ◽  
Xiong Yao ◽  
Hui Li ◽  
Zi-Xiang Li ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Topological Insulator ◽  
Surface States ◽  
The Other ◽  
Majorana Fermions ◽  
Bulk Conductivity ◽  
Indirect Coupling ◽  
Topological Surface ◽  
Excess Fe

The recent discovery of the interfacial superconductivity (SC) of the Bi2Te3/Fe1+yTe heterostructure has attracted extensive studies due to its potential as a novel platform for trapping and controlling Majorana fermions. Here we present studies of another topological insulator (TI)/Fe1+yTe heterostructure, Sb2Te3/Fe1+yTe, which also has an interfacial 2-dimensional SC. The results of transport measurements support that reduction of the excess Fe concentration of the Fe1+yTe layer not only increases the fluctuation of its antiferromagnetic (AFM) order but also enhances the quality of the SC of this heterostructure system. On the other hand, the interfacial SC of this heterostructure was found to have a wider-ranging TI-layer thickness dependence than that of the Bi2Te3/Fe1+yTe heterostructure, which is believed to be attributed to the much higher bulk conductivity of Sb2Te3that enhances indirect coupling between its top and bottom topological surface states (TSSs). Our results provide evidence of the interplay among the AFM order, itinerant carries from the TSSs, and the induced interfacial SC of the TI/Fe1+yTe heterostructure system.

scholarly journals Experimental signature of a topological quantum dot

Nanoscale ◽  
2020 ◽  
Vol 12 (44) ◽  
pp. 22817-22825
Author(s):  
Marie S. Rider ◽  
Maria Sokolikova ◽  
Stephen M. Hanham ◽  
Miguel Navarro-Cía ◽  
Peter D. Haynes ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Topological Insulator ◽  
Surface States ◽  
Topological Quantum

Topological insulator nanoparticles (TINPs) host topologically protected Dirac surface states, just like their bulk counterparts.

scholarly journals Tunable Coupling between Surface States of a Three-Dimensional Topological Insulator in the Quantum Hall Regime

2019 ◽  
Vol 123 (3) ◽  
Author(s):  
Su Kong Chong ◽  
Kyu Bum Han ◽  
Taylor D. Sparks ◽  
Vikram V. Deshpande
Keyword(s):  
Topological Insulator ◽  
Quantum Hall ◽  
Three Dimensional ◽  
Surface States ◽  
Quantum Hall Regime ◽  
Hall Regime ◽  
Tunable Coupling
Sign in / Sign up

Export Citation Format

Share Document