Gap generation and phase diagram in strained graphene in a magnetic field

Rybalka, D. O.; Gorbar, É. V.; Gusynin, V. P.

doi:10.1103/physrevb.91.115132

Cited by 7 publications

(3 citation statements)

References 57 publications

(106 reference statements)

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“…In the context of graphene it is responsible for the opening of a gap catalyzed by the strong magnetic field, which favours the electron-hole pairing formation. For pseudo-magnetic fields, it was shown [287,288,289] that strained graphene is similarly unstable towards an interaction induced gap, but in this case the ground state breaks time reversal symmetry and has a finite Hall conductivity [109]. An experimentally plausible scenario emerges when considering strain configurations that result in strong uniform pseudo-magnetic fields [57,290].…”

Section: Topological Phases Induced From the Interplay Between Strainmentioning

confidence: 99%

Novel effects of strains in graphene and other two dimensional materials

Amorim¹,

Cortijo²,

Juan³

et al. 2016

Physics Reports

385

401

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√s NN = 5.02 TeV using the ALICE detector at the LHC. The measurement covers the p T interval 0.5 < p T < 12 GeV/c and the rapidity range −1.065 < y cms < 0.135 in the centre-of-mass reference frame. The contribution of electrons from background sources was subtracted using an invariant mass approach. The nuclear modification factor R pPb was calculated by comparing the p T -differential invariant cross section in p-Pb collisions to a pp reference at the same centre-of-mass energy, which was obtained by interpolating measurements at √ s = 2.76 TeV and √ s = 7 TeV. The R pPb is consistent with unity within uncertainties of about 25%, which become larger for p T below 1 GeV/c. The measurement shows that heavy-flavour production is consistent with binary scaling, so that a suppression in the high-p T yield in Pb-Pb collisions has to be attributed to effects induced by the hot medium produced in the final state. The data in p-Pb collisions are described by recent model calculations that include cold nuclear matter effects. IntroductionThe Quark-Gluon Plasma (QGP) [1,2], a colour-deconfined state of strongly-interacting matter, is predicted to exist at high temperature according to lattice Quantum Chromodynamics (QCD) calculations [3]. These conditions can be reached in ultra-relativistic heavy-ion collisions [4][5][6][7][8][9][10]. Charm and beauty (heavy-flavour) quarks are mostly produced in initial hard scattering processes on a very short time scale, shorter than the formation time of the QGP medium [11], and thus experience the full temporal and spatial evolution of the collision. While interacting with the QGP medium, heavy quarks lose energy via elastic and radiative processes [12][13][14]. Heavy-flavour hadrons are therefore well-suited probes to study the properties of the QGP. The effect of energy loss on heavy-flavour production can be characterised via the nuclear modification factor (R AA ) of heavy-flavour hadrons. The R AA is defined as the ratio of the heavy-flavour hadron yield in nucleusnucleus (A-A) collisions to that in proton-proton (pp) collisions scaled by the average number of binary nucleon-nucleon collisions. The R AA is studied differentially as a function of transverse momentum (p T ), rapidity ( y) and collision centrality. It was measured at the Relativistic Heavy Ion Collider (RHIC) [15][16][17][18] and at the Large Hadron Collider (LHC) [19][20][21][22]. At RHIC, in central The interpretation of the measurements in A-A collisions requires the study of heavy-flavour production in p-A collisions, which provides access to cold nuclear matter (CNM) effects. These effects are not related to the formation of a colour-deconfined medium, but are present in case of colliding nuclei (or protonnucleus). An important CNM effect in the initial state is partondensity shadowing or saturation, which can be described using modified parton distribution functions (PDF) in the nucleus [23] or using the Color Glass Condensate (CGC) effective theory [24]. Further CNM effects include energy loss [25] in...

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Section: Topological Phases Induced From the Interplay Between Strainmentioning

confidence: 99%

Novel effects of strains in graphene and other two dimensional materials

Amorim¹,

Cortijo²,

Juan³

et al. 2016

Physics Reports

385

401

View full text Add to dashboard Cite

show abstract

“…Looking at the structure of the GF (7), one can see that the projectors P ± = (1 ± τ 3 sgn(B + ))/2 take into account that, for example, for B + > 0, the states on A and B sublattices involve L n and L n−1 , respectively. The most general expression of the propagator in the presence of B, B pm and various types of the gaps is provided in [24].…”

Section: Green's Function Sublattice and Valley Resolved Dosmentioning

confidence: 99%

Density of states of Dirac–Landau levels in a gapped graphene monolayer under strain gradient

Shubnyi

Sharapov

2017

Low Temperature Physics

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We study a gapped graphene monolayer in a combination of uniform magnetic field and straininduced uniform pseudomagnetic field. The presence of two fields completely removes the valley degeneracy. The resulting density of states shows a complicated behaviour that can be tuned by adjusting the strength of the fields. We analyze how these features can be observed in the sublattice, valley and full density of states. The analytical expression for the valley DOS is derived.

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“…[39][40][41][42][43][44][45][46][47] Furthermore, it is known that, strain engineering in graphene can modify its distances between ions in graphene-lattice sites, electronic structure, create polarized carrier puddles, induce pseudomagnetic fields, 48,49 and alter surface properties, which have been well investigated and summarized in previous studies and reviews. [50][51][52][53] The incredible elastic deformability of graphene, [54][55][56] capable of tolerating nondestructive reversible deformations up to extraordinarily high failure limits ( 25%, 57,58 26:5%, 59 or even 27% 60 ), prompted a series of studies on strain effects on graphene's electronic characteristics, notably bandgap engineering. The employment of a mixture of shear strain and uniaxial tensile deformations has been discovered to be the most convenient method for bandgap opening and tuning.…”

Section: Introductionmentioning

confidence: 99%

Strain-controlled charge and spin current rectifications in spin–orbit coupled graphene nano-ribbon: A new proposition

Majhi,

Maiti

2024

Journal of Applied Physics

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In this work, we investigate the possibilities of performing charge and spin current rectifications using graphene nano-ribbon in the presence of Rashba spin–orbit (SO) interaction. More specifically, we explore the specific role of mechanical strain on these two different types of current rectifications. The system is simulated by a tight-binding framework, where all the results are worked out based on the standard Green’s function formalism. In order to have current rectification, an asymmetry is required, which is incorporated through uncorrelated disorder among the constituent lattice points. From our extensive numerical analysis, we find that reasonably large charge and spin current rectifications can be obtained under strained conditions, and all the physical pictures are valid for a broad range of tight-binding parameters. The rectification properties are studied mostly for zigzag graphene nano-ribbons; however, an armchair ribbon is also taken into account for a clear comparison. Our work may provide a new direction of getting strain-controlled current rectifications in similar kinds of other physical systems as well.

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Gap generation and phase diagram in strained graphene in a magnetic field

Cited by 7 publications

References 57 publications

Novel effects of strains in graphene and other two dimensional materials

Novel effects of strains in graphene and other two dimensional materials

Density of states of Dirac–Landau levels in a gapped graphene monolayer under strain gradient

Strain-controlled charge and spin current rectifications in spin–orbit coupled graphene nano-ribbon: A new proposition

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