Institution
Global Alliance in Management Education
About: Global Alliance in Management Education is a based out in . It is known for research contribution in the topics: Magnetic field & Skyrmion. The organization has 577 authors who have published 2057 publications receiving 72848 citations. The organization is also known as: CEMS & The Global Alliance in Management Education.
Topics: Magnetic field, Skyrmion, Quantum, Qubit, Spin-½
Papers published on a yearly basis
Papers
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TL;DR: It is demonstrated that the thin film can have a giant anomalous Hall conductance, proportional to the thickness of the film, even though there is no Hall effect in 3D bulk material, and the emergence of a new topological phase, the nontrivial topological properties of which are hidden in the bulk insulator and manifest only in thin films.
Abstract: Because of the recent development of thin film and artificial superstructure growth techniques, it is possible to control the dimensionality of the system, smoothly between two and three dimensions. In this Letter we unveil the dimensional crossover of emergent topological phenomena in correlated topological materials. In particular, by focusing on the thin film of pyrochlore iridate antiferromagnets grown along the [111] direction, we demonstrate that the thin film can have a giant anomalous Hall conductance, proportional to the thickness of the film, even though there is no Hall effect in 3D bulk material. Moreover, in the case of ultrathin films, a quantized anomalous Hall conductance can be observed, despite the fact that the system is an antiferromagnet. In addition, we uncover the emergence of a new topological phase, the nontrivial topological properties of which are hidden in the bulk insulator and manifest only in thin films. This shows that the thin film of correlated topological materials is a new platform to search for unexplored novel topological phenomena.
81 citations
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TL;DR: In this article, the topological Hall effect in centrosymmetric EuO thin films was shown to persist down to the lowest temperature in the metallic region below 50 K for the films thinner than 200 nm.
Abstract: We report on the topological Hall effect (THE) in centrosymmetric EuO thin films. This THE signal persists down to the lowest temperature in the metallic region below 50 K for the films thinner than 200 nm. The signal rapidly disappears by tilting the applied magnetic field from surface normal, suggestive of noncoplanar spin configuration such as two-dimensional skyrmions. This observation possibly substantiates the theoretical proposal of magnetic skyrmions in 2D Heisenberg ferromagnets in marked contrast to better established $B20\text{\ensuremath{-}}\mathrm{type}$ chiral helimagnets.
81 citations
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TL;DR: It is demonstrated that alternate exposure of the surface to ultraviolet light and atomic oxygen allows tuning of the carrier density and the complete suppression of the 2DEG.
Abstract: We report on the formation of a two-dimensional electron gas (2DEG) at the bare surface of (111) oriented SrTiO3. Angle resolved photoemission experiments reveal highly itinerant carriers with a sixfold symmetric Fermi surface and strongly anisotropic effective masses. The electronic structure of the 2DEG is in good agreement with self-consistent tight-binding supercell calculations that incorporate a confinement potential due to surface band bending. We further demonstrate that alternate exposure of the surface to ultraviolet light and atomic oxygen allows tuning of the carrier density and the complete suppression of the 2DEG.
81 citations
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TL;DR: In this paper, the stability of gap-closing points in the three-dimensional Brillouin zone of semimetals using Clifford algebras and their representation theory was studied.
Abstract: We study the stability of gap-closing (Weyl or Dirac) points in the three-dimensional Brillouin zone of semimetals using Clifford algebras and their representation theory. We show that a pair of Weyl points with ${\mathbb{Z}}_{2}$ topological charge are stable in a semimetal with time-reversal and reflection symmetries when the square of the product of the two symmetry transformations equals minus identity. We present toy models of ${\mathbb{Z}}_{2}$ Weyl semimetals which have surface modes forming helical Fermi arcs. We also show that Dirac points with ${\mathbb{Z}}_{2}$ topological charge are stable in a semimetal with time-reversal, inversion, and SU(2) spin rotation symmetries when the square of the product of time-reversal and inversion equals plus identity. Furthermore, we briefly discuss the topological stability of point nodes in superconductors using Clifford algebras.
80 citations
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TL;DR: In this paper, it was shown that there exists a natural temporal analogue of the steering inequality when considering measurements on a single object at different times, and that violations of this temporal inequality can be connected to the security bound in the BB84 protocol.
Abstract: Quantum steering is the ability to remotely prepare different quantum states by using entangled pairs as a resource. Very recently, the concept of steering has been quantified with the use of inequalities, leading to substantial applications in quantum information and communication science. Here, we highlight that there exists a natural temporal analogue of the steering inequality when considering measurements on a single object at different times. We give non-trivial operational meaning to violations of this temporal inequality by showing that it is connected to the security bound in the BB84 protocol and thus may have applications in quantum communication.
80 citations
Authors
Showing all 577 results
Name | H-index | Papers | Citations |
---|---|---|---|
Yang Li | 117 | 1319 | 63111 |
Yoshinori Tokura | 117 | 858 | 70258 |
Franco Nori | 114 | 1117 | 63808 |
Fabio Marchesoni | 104 | 607 | 74687 |
Naoto Nagaosa | 101 | 659 | 51153 |
Masashi Kawasaki | 98 | 856 | 47863 |
Takuzo Aida | 95 | 479 | 37136 |
Wei Cui | 90 | 540 | 27921 |
Yong Xu | 88 | 1391 | 39268 |
Daniel Loss | 86 | 645 | 40817 |
Yasuhiro Tokura | 83 | 579 | 27472 |
Sadamichi Maekawa | 81 | 769 | 28964 |
D. Xu | 80 | 436 | 21679 |
Y. Tokura | 78 | 574 | 27348 |
Takao Someya | 77 | 430 | 30384 |