Quantum imaging of current flow in graphene
Jean-Philippe Tetienne,Nikolai Dontschuk,David A. Broadway,Alastair Stacey,David Simpson,Lloyd C. L. Hollenberg +5 more
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TLDR
Diamond-based quantum imaging of the current flow in graphene structures with submicrometer resolution is demonstrated and opens up an important new avenue to investigate fundamental electronic and spin transport in graphene structure and devices and, more generally, in emerging two-dimensional materials and thin-film systems.Abstract:
Since its first discovery in 2004, graphene has been found to host a plethora of unusual electronic transport phenomena, making it a fascinating system for fundamental studies in condensed matter physics as well as offering tremendous opportunities for future electronic and sensing devices. Typically, electronic transport in graphene has been investigated via resistivity measurements; however, these measurements are generally blind to spatial information critical to observing and studying landmark transport phenomena in real space and in realistic imperfect devices. We apply quantum imaging to the problem and demonstrate noninvasive, high-resolution imaging of current flow in monolayer graphene structures. Our method uses an engineered array of near-surface, atomic-sized quantum sensors in diamond to map the vector magnetic field and reconstruct the vector current density over graphene geometries of varying complexity, from monoribbons to junctions, with spatial resolution at the diffraction limit and a projected sensitivity to currents as small as 1 μA. The measured current maps reveal strong spatial variations corresponding to physical defects at the submicrometer scale. The demonstrated method opens up an important new avenue to investigate fundamental electronic and spin transport in graphene structures and devices and, more generally, in emerging two-dimensional materials and thin-film systems.read more
Citations
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Sensitivity optimization for NV-diamond magnetometry
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Probing condensed matter physics with magnetometry based on nitrogen-vacancy centres in diamond
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References
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Andrea C. Ferrari,Jannik C. Meyer,Vittorio Scardaci,Cinzia Casiraghi,Michele Lazzeri,Francesco Mauri,S. Piscanec,Da Jiang,K. S. Novoselov,S. Roth,A. K. Geim +10 more
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Electronic spin transport and spin precession in single graphene layers at room temperature
TL;DR: The observation of spin transport, as well as Larmor spin precession, over micrometre-scale distances in single graphene layers is reported, indicating that spin coherence extends underneath all of the contacts.
Journal ArticleDOI
Nanoscale imaging magnetometry with diamond spins under ambient conditions
Gopalakrishnan Balasubramanian,I. Y. Chan,I. Y. Chan,Roman Kolesov,Mohannad Al-Hmoud,Julia Tisler,Chang S. Shin,Changdong Kim,Aleksander K. Wójcik,Philip R. Hemmer,Anke Krueger,Tobias Hanke,Alfred Leitenstorfer,Rudolf Bratschitsch,Fedor Jelezko,Jörg Wrachtrup +15 more
TL;DR: This work shows how magneto-optical spin detection can be used to determine the location of a spin associated with a single nitrogen-vacancy centre in diamond with nanometre resolution under ambient conditions, and demonstrates the use of a single diamond spin as a scanning probe magnetometer to map nanoscale magnetic field variations.
Journal ArticleDOI
The nitrogen-vacancy colour centre in diamond
Marcus W. Doherty,Marcus W. Doherty,Neil B. Manson,Paul Delaney,Paul Delaney,Fedor Jelezko,Joerg Wrachtrup,Lloyd C. L. Hollenberg +7 more
TL;DR: The nitrogen-vacancy (NV) colour centre in diamond is an important physical system for emergent quantum technologies, including quantum metrology, information processing and communications, as well as for various nanotechnologies such as biological and sub-diffraction limit imaging, and for tests of entanglement in quantum mechanics as mentioned in this paper.
Journal ArticleDOI
The nitrogen-vacancy colour centre in diamond
Marcus W. Doherty,Marcus W. Doherty,Neil B. Manson,Paul Delaney,Paul Delaney,Fedor Jelezko,Joerg Wrachtrup,Lloyd C. L. Hollenberg +7 more
TL;DR: The nitrogen-vacancy (NV) colour centre in diamond is an important physical system for emergent quantum technologies, including quantum metrology, information processing and communications, as well as for various nanotechnologies such as biological and sub-diffraction limit imaging, and for tests of entanglement in quantum mechanics as mentioned in this paper.