RepositóriUM Collection: Outros Documentos/Other Documents (without refereeing)
http://hdl.handle.net/1822/1919
Outros Documentos/Other Documents (without refereeing)2019-06-16T11:43:26ZAn introduction to graphene plasmonics
http://hdl.handle.net/1822/47406
<b>Title</b>: An introduction to graphene plasmonics
<b>Author(s)</b>: Gonçalves, Paulo André Dias; Peres, N. M. R.
<b>Abstract(s)</b>: This book is meant as an introduction to graphene plasmonics and aims at the advanced undergraduate and graduate students entering the field of plasmonics in graphene. In it different theoretical methods are introduced, starting with an elementary description of graphene plasmonics and evolving towards more advanced topics. This book is essentially self-contained and brings together a number of different topics about the field that are scattered in the vast literature. The text is composed of eleven chapters and of a set of detailed appendices. It can be read in two different ways: Reading only the chapters to get acquainted with the field of plasmonics in graphene or reading the chapters and studying the appendices to get a working knowledge of the topic. The study of the material in this book will bring the students to the forefront of the research in this field.
<b>Type</b>: bookPreface [to] An introduction to graphene plasmonics
http://hdl.handle.net/1822/45335
<b>Title</b>: Preface [to] An introduction to graphene plasmonics
<b>Author(s)</b>: Gonçalves, Paulo André Dias; Peres, N. M. R.
<b>Abstract(s)</b>: [Excerpt] Over the last few years, graphene plasmonics has emerged as a new research
topic, positioned at the interface between condensed matter physics
and photonics. This still young but rapidly growing field, resulting from
the overlap between graphene physics and plasmonics, deals with the investigation
and exploration of graphene surface plasmon-polaritons (GSPs)
for controlling light-matter interactions and manipulating light at the
nanoscale.
In 2011, experimental research in plasmonics in graphene was in its
infancy. Some theoretical papers had already been written, but the field
was awaiting for some sort of experimental boost. In 2011 a seminal experimental
paper (to be discussed in Section 7.1) emerged, demonstrating
that plasmonic effects in graphene could be controlled optically, by shining
electromagnetic radiation onto a periodic grid of graphene micro-ribbons.
This opened a new avenue in graphene physics, launching the new flourishing
field of graphene plasmonics. Since then, the field has been witnessing
enormous developments at a rapid pace (to be described in Section 1.2).
This is a book on plasmonics in graphene. It grew out of the authors’
own interest in the field. Many of the topics covered here refer to problems
that were amongst the first to appear in the scientific literature, to which
one of the authors has contributed to some extent. Throughout this monograph
we have tried to make this book as self-contained as possible, and
to provide substantial detail in all derivations. Indeed, with a pencil, some
sheets of paper, a dose of enthusiasm, and, at times, a bit of effort, the
interested reader should find it easy to reproduce all the results in the book
(the Appendices will be most useful for such endeavor). Therefore, we hope
that this book will serve as a springboard for any newcomer in graphene plasmonics. Hopefully, the advanced researcher may also find reasons to
keep this book in her/his shelf and to recommend it to her/his students.
This is also a book about theoretical techniques to deal with plasmonics
in graphene. Many of these techniques have been applied to metal plasmonics
before and have been adapted here to tackle plasmonic effects in
graphene. The main difference is that metals are described by a complex
dielectric function, whereas graphene is described by its complex (non-local
whenever necessary) optical conductivity and its sheet (two-dimensional)
current. (...)
<b>Type</b>: preface2017-04-18T10:22:50ZShubnikov - de haas effect in tilted magnetic fields in wide quantum well
http://hdl.handle.net/1822/21646
<b>Title</b>: Shubnikov - de haas effect in tilted magnetic fields in wide quantum well
<b>Author(s)</b>: Larkin, Ivan; Ujevic, S.; Wiedmann, S.; Gusev, G. M.; Portal, J. C.; Bakarov, A. K.
<b>Abstract(s)</b>: Bilayer two-dimensional electron system in double quantum wells demonstrated oscillations of the symmetric–antisymmetric energy gap in the presence of the in-plane magnetic field [1] which has been attributed to Aharonov-Bohm interference effect between cyclotron orbits in different layers [2]. The charge distribution in a wide single quantum well is more subtle than the one in the double quantum well. Here the Coulomb repulsion of the electrons in the well leads to a soft barrier inside the well, which in turn results in a bilayer electron system. Applying of the in-plane magnetic field can also lead to the charge redistribution inside of the well and distortion of the circular Fermi contour.
In the present work we have measured and calculated Shubnikov – de Haas effect in wide wells in the tilted magnetic field. The samples used in this paper have a well with of w=45 nm with a density ns = 9.1x1011 cm-2, see sketch of profile in figure (a) with symmetric (S) and anti-symmetric (AS) wave functions.
<b>Type</b>: conferencePaper2012-12-18T09:57:26ZMagnetic Gradient edge magnetoplasmons in non-uniform magnetic field
http://hdl.handle.net/1822/21644
<b>Title</b>: Magnetic Gradient edge magnetoplasmons in non-uniform magnetic field
<b>Author(s)</b>: Larkin, Ivan; Balev, O. G.
<b>Abstract(s)</b>: We have theoretically studied two-dimensional electron gas placed in a strong laterally non-uniform magnetic field, which appears due to ferromagnetic film . We have found, that in this case 2DEG experiences static charge redistribution that strongly depends on presence and configuration of the gates on the surface of a heterostructure. Also, it is shown that lateral inhomogeneity of a strong magnetic field allows itself “magnetic gradient” or “magnetic-edge” magnetoplasmons due to complex lateral structure of magnetic field gradient. This mechanism is different from usual “density gradient” edge magnetoplasmons [2]. We have investigated two families of different-chirality modes localized near the edge of the magnetic film. Each chirality’s mode family at small wave vector has one fundamental state with logarithmically large phase velocity.
<b>Type</b>: conferenceAbstract2012-12-18T09:51:05ZVisualization of wave function of quantum dot at fermi-edge singularity regime
http://hdl.handle.net/1822/21640
<b>Title</b>: Visualization of wave function of quantum dot at fermi-edge singularity regime
<b>Author(s)</b>: Larkin, Ivan; Vdovin, E. E.; Khanin, Yu. N.; Ujevic, S.; Henini, M.
<b>Abstract(s)</b>: We consider electron tunneling spectroscopy through an InAs quantum dot in a magnetic field applied perpendicular to the tunneling direction. We examine in details the anisotropic behavior of the amplitude and shape of the resonant peaks of I-V curves and concluded that (i) magnetotunneling spectroscopy at FES regime allows establishing position of resonant level in QD with high accuracy. (ii) The distinguishable shape of FES peak allows extracting the amplitude with much better accuracy. (iii) FES exponent dependence on magnetic field gives additional information about potential distribution outside QD.
<b>Type</b>: conferencePaper2012-12-18T09:32:16Z