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Nanomaterials
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Magnetism and Kondo Effect in Graphene
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Magnetism and Kondo Effect in Graphene

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "2D and Carbon Nanomaterials".

Deadline for manuscript submissions: closed (31 October 2022) | Viewed by 3259

Special Issue Editor

Prof. Dr. Eugene Kogan

E-Mail Website
Guest Editor
Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel
Interests: graphene; kondo effect; renormalization and scaling
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Graphene is an allotrope of carbon consisting of a single layer of atoms arranged in a two-dimensional (2D) honeycomb lattice. Graphene’s unique properties of thinness and conductivity have led to global research into its applications as a semiconductor. On the other hand, graphene is a model system used for the study of electrons confined to a strictly two-dimensional layer, and this has made it the favorite benchmark of theorists. The physics of graphene and graphene-based systems has inspired the application and development of many advanced theoretical methods, including those outside the scope of traditional condensed matter physics.

Fundamental studies go hand-in-hand with applied ones and, in some cases, the former have even opened doors to possible applications.

Many magnetic phenomena in graphene are manifestly different from their counterparts in more traditional materials.

In particular, the low dimensionality and nontrivial band dispersion of electrons in graphene strongly influence electron interaction with local magnetic moments and give rise to interesting physics different from that seen in conventional 3D materials.

This Special Issue of Nanomaterials will attempt to cover recent studies, both theoretical and experimental, that advance our understanding of magnetism in graphene and other 2D layered materials. This includes both fundamental research of the mechanical, transport, magnetic, and optical properties of graphene and studies of graphene-based electronic devices and structures.

Prof. Dr. Eugene Kogan
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • graphene
  • 2D layered materials
  • kondo effect
  • local magnetic moments
  • magnetic properties

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Published Papers (2 papers)

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16 pages, 979 KiB  
Article
Two-Channel Charge-Kondo Physics in Graphene Quantum Dots
by Emma L. Minarelli, Jonas B. Rigo and Andrew K. Mitchell
Nanomaterials 2022, 12(9), 1513; https://doi.org/10.3390/nano12091513 - 29 Apr 2022
Viewed by 2722
Abstract
Nanoelectronic quantum dot devices exploiting the charge-Kondo paradigm have been established as versatile and accurate analogue quantum simulators of fundamental quantum impurity models. In particular, hybrid metal–semiconductor dots connected to two metallic leads realize the two-channel Kondo (2CK) model, in which Kondo screening [...] Read more.
Nanoelectronic quantum dot devices exploiting the charge-Kondo paradigm have been established as versatile and accurate analogue quantum simulators of fundamental quantum impurity models. In particular, hybrid metal–semiconductor dots connected to two metallic leads realize the two-channel Kondo (2CK) model, in which Kondo screening of the dot charge pseudospin is frustrated. In this article, a two-channel charge-Kondo device made instead from graphene components is considered, realizing a pseudogapped version of the 2CK model. The model is solved using Wilson’s Numerical Renormalization Group method, uncovering a rich phase diagram as a function of dot–lead coupling strength, channel asymmetry, and potential scattering. The complex physics of this system is explored through its thermodynamic properties, scattering T-matrix, and experimentally measurable conductance. The strong coupling pseudogap Kondo phase is found to persist in the channel-asymmetric two-channel context, while in the channel-symmetric case, frustration results in a novel quantum phase transition. Remarkably, despite the vanishing density of states in the graphene leads at low energies, a finite linear conductance is found at zero temperature at the frustrated critical point, which is of a non-Fermi liquid type. Our results suggest that the graphene charge-Kondo platform offers a unique possibility to access multichannel pseudogap Kondo physics. Full article
(This article belongs to the Special Issue Magnetism and Kondo Effect in Graphene)
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12 pages, 835 KiB  
Article
Band Polarization Effect on the Kondo State in a Zigzag Silicene Nanoribbon
by Ginetom S. Diniz, Edson Vernek and George B. Martins
Nanomaterials 2022, 12(9), 1480; https://doi.org/10.3390/nano12091480 - 27 Apr 2022
Cited by 1 | Viewed by 1687
Abstract
Using the Numerical Renormalization Group method, we study the properties of a quantum impurity coupled to a zigzag silicene nanoribbon (ZSNR) that is subjected to the action of a magnetic field applied in a generic direction. We propose a simulation of what a [...] Read more.
Using the Numerical Renormalization Group method, we study the properties of a quantum impurity coupled to a zigzag silicene nanoribbon (ZSNR) that is subjected to the action of a magnetic field applied in a generic direction. We propose a simulation of what a scanning tunneling microscope will see when investigating the Kondo peak of a magnetic impurity coupled to the metallic edge of this topologically non-trivial nanoribbon. This system is subjected to an external magnetic field that polarizes the host much more strongly than the impurity. Thus, we are indirectly analyzing the ZSNR polarization through the STM analysis of the fate of the Kondo state subjected to the influence of the polarized conduction electron band. Our numerical simulations demonstrate that the spin-orbit-coupling-generated band polarization anisotropy is strong enough to have a qualitative effect on the Kondo peak for magnetic fields applied along different directions, suggesting that this contrast could be experimentally detected. Full article
(This article belongs to the Special Issue Magnetism and Kondo Effect in Graphene)
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