scholarly journals Adjustable Quantum Interference Oscillations in Sb-Doped Bi2Se3 Topological Insulator Nanoribbons

ACS Nano ◽  
2020 ◽  
Vol 14 (10) ◽  
pp. 14118-14125
Author(s):  
Hong-Seok Kim ◽  
Tae-Ha Hwang ◽  
Nam-Hee Kim ◽  
Yasen Hou ◽  
Dong Yu ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Quantum Interference ◽  
Interference Oscillations

scholarly journals Gate-Modulated Quantum Interference Oscillations in Sb-Doped Bi2Se3 Topological Insulator Nanoribbon

2020 ◽  
Vol 77 (9) ◽  
pp. 797-801
Author(s):  
Tae-Ha Hwang ◽  
Hong-Seok Kim ◽  
Yasen Hou ◽  
Dong Yu ◽  
Yong-Joo Doh
Keyword(s):  
Topological Insulator ◽  
Quantum Interference ◽  
Interference Oscillations

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.

Quantum Interference Control of Photocurrents in Topological Insulator Films

CLEO: 2015 ◽  
2015 ◽  
Author(s):  
Derek A. Bas ◽  
Kevin Vargas-Valez ◽  
Sercan Babakiray ◽  
Trent A. Johnson ◽  
David Lederman ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Quantum Interference ◽  
Interference Control

scholarly journals Epitaxial Growth and Structural Characterizations of MnBi2Te4 Thin Films in Nanoscale

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3322
Author(s):  
Shu-Hsuan Su ◽  
Jen-Te Chang ◽  
Pei-Yu Chuang ◽  
Ming-Chieh Tsai ◽  
Yu-Wei Peng ◽  
...  
Keyword(s):  
Epitaxial Growth ◽  
Topological Insulator ◽  
Quantum Interference ◽  
Growth Parameters ◽  
Magnetic Measurement ◽  
Magnetic Hysteresis ◽  
Flux Ratio ◽  
Growth Surface ◽  
Antiferromagnetic Order ◽  
Device Applications

The intrinsic magnetic topological insulator MnBi2Te4 has attracted much attention due to its special magnetic and topological properties. To date, most reports have focused on bulk or flake samples. For material integration and device applications, the epitaxial growth of MnBi2Te4 film in nanoscale is more important but challenging. Here, we report the growth of self-regulated MnBi2Te4 films by the molecular beam epitaxy. By tuning the substrate temperature to the optimal temperature for the growth surface, the stoichiometry of MnBi2Te4 becomes sensitive to the Mn/Bi flux ratio. Excessive and deficient Mn resulted in the formation of a MnTe and Bi2Te3 phase, respectively. The magnetic measurement of the 7 SL MnBi2Te4 film probed by the superconducting quantum interference device (SQUID) shows that the antiferromagnetic order occurring at the Néel temperature 22 K is accompanied by an anomalous magnetic hysteresis loop along the c-axis. The band structure measured by angle-resolved photoemission spectroscopy (ARPES) at 80 K reveals a Dirac-like surface state, which indicates that MnBi2Te4 has topological insulator properties in the paramagnetic phase. Our work demonstrates the key growth parameters for the design and optimization of the synthesis of nanoscale MnBi2Te4 films, which are of great significance for fundamental research and device applications involving antiferromagnetic topological insulators.

scholarly journals Blind Witnesses Quench Quantum Interference without Transfer of Which-Path Information

Entropy ◽  
2020 ◽  
Vol 22 (7) ◽  
pp. 776
Author(s):  
Craig S. Lent
Keyword(s):  
Magnetic Flux ◽  
Quantum Computation ◽  
Time Evolution ◽  
Quantum State ◽  
Quantum Interference ◽  
Quantum Double ◽  
Global System ◽  
Path Information ◽  
Interference Oscillations ◽  
Loss Of Coherence

Quantum computation is often limited by environmentally-induced decoherence. We examine the loss of coherence for a two-branch quantum interference device in the presence of multiple witnesses, representing an idealized environment. Interference oscillations are visible in the output as the magnetic flux through the branches is varied. Quantum double-dot witnesses are field-coupled and symmetrically attached to each branch. The global system—device and witnesses—undergoes unitary time evolution with no increase in entropy. Witness states entangle with the device state, but for these blind witnesses, which-path information is not able to be transferred to the quantum state of witnesses—they cannot “see” or make a record of which branch is traversed. The system which-path information leaves no imprint on the environment. Yet, the presence of a multiplicity of witnesses rapidly quenches quantum interference.

scholarly journals Quantum interference in topological insulator Josephson junctions

2016 ◽  
Vol 93 (19) ◽  
Author(s):  
Juntao Song ◽  
Haiwen Liu ◽  
Jie Liu ◽  
Yu-Xian Li ◽  
Robert Joynt ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Josephson Junctions ◽  
Quantum Interference

scholarly journals Nanomechanical characterization of quantum interference in a topological insulator nanowire

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Minjin Kim ◽  
Jihwan Kim ◽  
Yasen Hou ◽  
Dong Yu ◽  
Yong-Joo Doh ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
Topological Insulator ◽  
Quantum Interference ◽  
Mechanical Vibration ◽  
Surface States ◽  
Impurity Scattering ◽  
Dirac Fermion ◽  
One Dimensional ◽  
Aharonov Bohm

Abstract Aharonov–Bohm conductance oscillations emerge as a result of gapless surface states in topological insulator nanowires. This quantum interference accompanies a change in the number of transverse one-dimensional modes in transport, and the density of states of such nanowires is also expected to show Aharonov–Bohm oscillations. Here, we demonstrate a novel characterization of topological phase in Bi2Se3 nanowire via nanomechanical resonance measurements. The nanowire is configured as an electromechanical resonator such that its mechanical vibration is associated with its quantum capacitance. In this way, the number of one-dimensional transverse modes is reflected in the resonant frequency, thereby revealing Aharonov–Bohm oscillations. Simultaneous measurements of DC conductance and mechanical resonant frequency shifts show the expected oscillations, and our model based on the gapless Dirac fermion with impurity scattering explains the observed quantum oscillations successfully. Our results suggest that the nanomechanical technique would be applicable to a variety of Dirac materials.

Quantum interference of spontaneous-emission channels near the surface of Bi2Se3

2021 ◽  
pp. 2150154
Author(s):  
Dimitrios Karaoulanis ◽  
Vassilios Yannopapas
Keyword(s):  
Spontaneous Emission ◽  
Topological Insulator ◽  
Quantum Interference ◽  
Emission Rate ◽  
Strong Dependence ◽  
Spontaneous Emission Rate ◽  
Atomic Dipole

We show that the quantum interference between two spontaneous emission channels can be significantly enhanced when a three-level V-type atom is placed near the surface of the topological insulator [Formula: see text]. The enhancement of quantum interference is a result of the strong dependence of the spontaneous emission rate on the orientation of an atomic dipole relative to surface of the [Formula: see text] at the frequencies of polaritonic-type excitations.

scholarly journals Quantum Interference Oscillations of the Superparamagnetic Blocking in anFe8Molecular Nanomagnet

2013 ◽  
Vol 111 (5) ◽  
Author(s):  
E. Burzurí ◽  
F. Luis ◽  
O. Montero ◽  
B. Barbara ◽  
R. Ballou ◽  
...  
Keyword(s):  
Quantum Interference ◽  
Interference Oscillations
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