In-plane magnetic textures at the surface of topological insulators

Katsnelson, M. I.; Guinea, F.; Vozmediano, María A. H.

doi:10.1209/0295-5075/104/17001

Cited by 5 publications

(6 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…But as we already said, the exact value of K ⊥ m is going to be irrelevant for us, as it is going to be small compared to K ⊥ x1 and K ⊥ x2 . The equations of motion are readily obtained from (9) in this regime. After fixing the electromagnetic current configuration (see Appendix D) and incorporating Gilbert damping 3 we have:…”

Section: A Effective Action In the Chiral Regimementioning

confidence: 99%

“…In this context, three dimensional Topological Insulators (TI) provide a new spectrum of possibilities regarding DW motion. An interesting aspect of the surface states of three dimensional TI is that external magnetic agents can modify their spectrum 9 and electronic transport properties 10 , and conversely, the dynamics of magnets coupled to these surface states can be severely modified [11][12][13][14] . Specifically, the question of how the presence of these surface states influences the dynamics of a DW has been recently addressed in the literature 12,14 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Domain wall motion in junctions of thin-film magnets and topological insulators

Ferreirós¹,

Cortijo²

2014

Phys. Rev. B

View full text Add to dashboard Cite

We derive the equations of motionof a domain wall in a thin-film magnet coupled to the surface states of a topological insulator, in the presence of both an electric field along the domain wall and a magnetic field perpendicular to the junction. We show how the electric field acts as a chirality stabilizer holding off the appearance of Walker breakdown and enhancing the terminal velocity of the wall. We also propose a mechanism to reverse the domain wall chirality in a controllable manner, by tuning the chiral current flowing through the wall. An input from a weak perpendicular magnetic field is required in order to break the reflection symmetry that protects the degeneracy of the chirality vacuum.

show abstract

Section: A Effective Action In the Chiral Regimementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Domain wall motion in junctions of thin-film magnets and topological insulators

Ferreirós¹,

Cortijo²

2014

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…Specifically, in graphene the artificial gauge and metric fields represent the elastic (phonon) degrees of freedom, their effective vector and scalar potentials (42) being composed of the components of the strain tensor [285][286][287][288][289][290][291][292][293], .…”

Section: Analogue Holography Demonstratorsmentioning

confidence: 99%

Demystifying the holographic mystique: A critical review

Khveshchenko¹

2016

Lith. J. Phys.

View full text Add to dashboard Cite

Thus far, in spite of many interesting developments, the overall progress towards a systematic study and classification of various 'strange' metallic states of matter has been rather limited. To that end, it was argued that a recent proliferation of the ideas of holographic correspondence originating from string theory might offer a possible way out of the stalemate. However, after almost a decade of intensive studies into the proposed extensions of the holographic conjecture to a variety of condensed matter problems, the validity of this intriguing approach remains largely unknown. This discussion aims at ascertaining its true status and elucidating the conditions under which some of its predictions may indeed be right (albeit, possibly, for a wrong reason).Keywords: strongly correlated systems, holographic correspondence, transport theory, strange metals, analogue gravity PACS: 71.27.+a Condensed matter holography: the promiseAmong the outstanding grand problems in condensed matter physics is that of a deeper understanding and classification of the so-called 'strange metals' or compressible non-Fermi liquid (NFL) states of the strongly interacting systems. However, despite all the effort and a plethora of the important and nontrivial results obtained with the use of the traditional techniques, this program still remains far from completion.As an alternate approach, over the past decade there have been numerous attempts inspired by the hypothetical idea of holographic correspondence which originated from string/gravity/high energy theory (where it is known under the acronym AdS/ CFT) to adapt its main concepts to various condensed matter (or, even more generally, quantum manybody) systems at finite densities and temperatures [1][2][3][4][5][6][7].In its original context, the bona fide holographic principle postulates that certain d + 1-dimensional ('boundary') quantum field theories (e. g. the maximally supersymmetric SU(N) gauge theory) may allow for a dual description in terms of a string theory which, upon a proper compactification, amounts to a certain d + 2-dimensional ('bulk') supergravity. Moreover, in the strong coupling limit (characterized in terms of the t'Hooft coupling constant λ = g 2 N >> 1) and for a large rank N > > 1 of the gauge symmetry group, the bulk description can be further reduced down to a weakly fluctuating gravity model which can even be treated semiclassically at the lowest (0th) order of the underlying 1/N-expansion.In the practical applications of the holographic conjecture, the partition function of a strongly interacting boundary theory with the Lagrangian L(ϕ a ) would then be approximated by a saddle-point (classical) value of the bulk action described by the Lagrangian L(g μν ,…) which includes gravity and other fields dual to their boundary counterparts [1][2][3][4][5][6][7][8] (1) evaluated with the use of a fixed background metric ,while any quantum corrections would usually be neglected by invoking the small parameter 1/N.

show abstract

“…It is also noteworthy to mention that the authors of Ref. [53] have treated a similar problem of a magnetic vortex coating the surface of a TI. However, in this work, the authors have considered the question of whether an effective gauge field would be induced by strain on the surface of a topological insulator.…”

Section: Bound Statesmentioning

confidence: 99%

Bound-states and polarized charged zero modes in three-dimensional topological insulators induced by a magnetic vortex

2013

View full text Add to dashboard Cite

By coating a three-dimensional topological insulator (TI) with a ferromagnetic film supporting an in-plane magnetic vortex, one breaks the time-reversal symmetry (TRS) without generating a mass gap. It rather yields electronic states bound to the vortex center which have different probabilities associated with each spin mode. In addition, its associate current (around the vortex center) is partially polarized with an energy gap separating the most excited bound state from the scattered ones. Charged zero-modes also appear as fully polarized modes localized near the vortex center. From the magnetic point of view, the observation of such a special current in a TI-magnet sandwich comes about as an alternative technique for detecting magnetic vortices in magnetic thin films. 75.30.Hx,

show abstract

In-plane magnetic textures at the surface of topological insulators

Cited by 5 publications

References 37 publications

Domain wall motion in junctions of thin-film magnets and topological insulators

Domain wall motion in junctions of thin-film magnets and topological insulators

Demystifying the holographic mystique: A critical review

Bound-states and polarized charged zero modes in three-dimensional topological insulators induced by a magnetic vortex

Contact Info

Product

Resources

About