News & Views |
Featured
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Article |
Spin polarization of the quantum spin Hall edge states
The quantum spin Hall state is predicted to consist of two oppositely polarized spin currents travelling in opposite directions around the edges of a topological insulator. Non-local measurements of the transport in HgTe quantum wells confirm the polarized nature of these edge states.
- Christoph Brüne
- , Andreas Roth
- & Shou-Cheng Zhang
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Article |
Spin and valley quantum Hall ferromagnetism in graphene
The extra states sometimes observed in graphene’s quantum Hall characteristics have been presumed to be the result of broken SU(4) symmetry. Magnetotransport measurements of high-quality graphene in a tilted magnetic field finally prove this is indeed the case.
- A. F. Young
- , C. R. Dean
- & P. Kim
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Correspondence |
Origin of logarithmic resistance correction in graphene
- Johannes Jobst
- & Heiko B. Weber
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Correspondence |
Reply to "Origin of logarithmic resistance correction in graphene"
- Jian-Hao Chen
- , Liang Li
- & Michael S. Fuhrer
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Letter |
Surface conduction of topological Dirac electrons in bulk insulating Bi2Se3
Despite their name, the bulk electrical conductivity of most topological insulators is relatively high, masking many of the important characteristics of its protected, surface conducting states. Counter-doping reduces the bulk conductivity of Bi2Se3 significantly, allowing these surface states and their properties to be clearly identified.
- Dohun Kim
- , Sungjae Cho
- & Michael S. Fuhrer
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Letter |
Nature of magnetic excitations in superconducting BaFe1.9Ni0.1As2
An outstanding question about the iron-based superconductors has been whether or not their magnetic characteristics are dominated by itinerant or localized magnetic moments. Absolute measurements and calculations of the magnetic response of undoped and Ni-doped BaFe2As2 indicate the latter.
- Mengshu Liu
- , Leland W. Harriger
- & Pengcheng Dai
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Letter |
Emergence of superlattice Dirac points in graphene on hexagonal boron nitride
It is well known that graphene deposited on hexagonal boron nitride produces moiré patterns in scanning tunnelling microscopy images. The interaction that produces this pattern also produces a commensurate periodic potential that generates a set of Dirac points that are different from those of the graphene lattice itself.
- Matthew Yankowitz
- , Jiamin Xue
- & Brian J. LeRoy
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Letter |
Nodal superconducting-gap structure in ferropnictide superconductor BaFe2(As0.7P0.3)2
The Cooper pairs of conventional superconductors exhibit a nodeless s-wave symmetry, and most unconventional superconductors, including cuprates and heavy-fermion materials, exhibit nodal d-wave pairing. In contrast to both, angle-resolved photoemission spectroscopy measurements indicate that the iron-based superconductor BaFe2(As0.7P0.3)2 exhibits an unusual nodal s-wave pairing.
- Y. Zhang
- , Z. R. Ye
- & D. L. Feng
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News & Views |
To see a SAW
Mechanical oscillations of microscopic resonators have recently been observed in the quantum regime. This idea could soon be extended from localized vibrations to travelling waves thanks to a sensitive probe of so-called surface acoustic waves.
- Aashish Clerk
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Article |
Local probing of propagating acoustic waves in a gigahertz echo chamber
Mechanical oscillations of microscopic resonators have recently been observed in the quantum regime. This idea could soon be extended from localized vibrations to travelling waves thanks to a sensitive probe of so-called surface acoustic waves.
- Martin V. Gustafsson
- , Paulo V. Santos
- & Per Delsing
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News & Views |
Carbon's superconducting footprint
Graphene exhibits many extraordinary properties, but superconductivity isn't one of them. Two theoretical studies suggest that by decorating the surface of graphene with the right species of dopant atoms, or by using ionic liquid gating, superconductivity could yet be induced.
- Oskar Vafek
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Article |
Giant superfluorescent bursts from a semiconductor magneto-plasma
Superfluorescence—the emission of coherent light from an initially incoherent collection of excited dipoles—is now identified in a semiconductor. Laser-excited electron–hole pairs spontaneously polarize and then abruptly decay to produce intense pulses of light.
- G. Timothy Noe II
- , Ji-Hee Kim
- & Junichiro Kono
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Article |
Chiral superconductivity from repulsive interactions in doped graphene
Chiral superconducting states are expected to support a variety of exotic and potentially useful phenomena. Theoretical analysis suggests that just such a state could emerge in a doped graphene monolayer.
- Rahul Nandkishore
- , L. S. Levitov
- & A. V. Chubukov
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Letter |
Phonon-mediated superconductivity in graphene by lithium deposition
Graphene exhibits many extraordinary properties. But, despite many attempts to find ways to induce it, superconductivity is not one of them. First-principles calculations suggest that by decorating the surface of graphene with lithium atoms, it could yet be made to superconduct.
- Gianni Profeta
- , Matteo Calandra
- & Francesco Mauri