Helicity-dependent photocurrents in graphene layers excited by midinfrared radiation of a CO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>laser

Jiang, Chongyun; Shalygin, V. A.; Panevin, V. Yu.; Danilov, Sergey; Glazov, M. M.; Yakimova, Rositsa; Lara‐Avila, Samuel; Kubatkin, Sergey; Ganichev, Sergey

doi:10.1103/physrevb.84.125429

Cited by 98 publications

(102 citation statements)

References 39 publications

(111 reference statements)

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“…Helicitydependent photocurrents in single layer graphene were observed in Ref. 47. The existence of such photocurrents induced by an in-plane external magnetic field and Rashba-like spin-orbit effects 48,49 was recently suggested in graphene.…”

mentioning

confidence: 95%

Polarization-dependent photocurrents in polar stacks of van der Waals solids

Lyanda-Geller¹,

Li²,

Andreev³

2015

Phys. Rev. B

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Monolayers of semiconducting van der Waals solids, such as transition metal dichalcogenides (TMDs), acquire significant electric polarization normal to the layers when placed on a substrate or in a heterogeneous stack. This causes linear coupling of electrons to electric fields normal to the layers. Irradiation at oblique incidence at frequencies above the gap causes interband transitions due to coupling to both normal and in-plane ac electric fields. The interference between the two processes leads to sizable in-plane photocurrents and valley currents. The direction and magnitude of currents is controlled by light polarization and is determined by its helical or nonhelical components. The helicity-dependent ballistic current arises due to asymmetric photogeneration. The non-helical current has a ballistic contribution (dominant in sufficiently clean samples) caused by asymmetric scattering of photoexcited carriers, and a side-jump contribution. Magneto-induced photocurrent is due to the Lorentz force or due to intrinsic magnetic moment related to Berry curvature.

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mentioning

confidence: 95%

Polarization-dependent photocurrents in polar stacks of van der Waals solids

Lyanda-Geller¹,

Li²,

Andreev³

2015

Phys. Rev. B

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“…The helicity of the photon for circular polarization is defined as sin2 so that it becomes a continuous variable with zero value at a few points. The photocurrent normal to the plane is proportional to the helicity [6]. In the case of particles, there are only two values of the helicity, + and -.…”

Section: A Spin and Helicitymentioning

confidence: 99%

The Quantum Hall Effect: Helicity, Graphite and Graphene

Shrivastava¹

2013

IJAPM

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Abstract-TheHall resistivity is explained to arise from the spin and angular momemtum which leads to fractional charge in a natural way. There are helical orbits for the electrons in a magnetic field so that the + sign in spin gives one helicity while the -sign gives another, which is also related to the sign of the electron velocity. The fractions which arise in the graphite resistivity are explained in terms of principal fractions, resonances, sum processes and clusters. The graphene Hall effect data is explained by using the Landau levels with special treatment of spin. The two layer graphene is well explained. A small number of fractions are explained in terms of sample-dependent clusters which are found in some of the samples. While most of the fractions are a property of pure samples, some of the fractions are induced by the clusters.Index Terms-Graphene, graphite, helicity, quantum hall effect, special spin. I. INTRODUCTIONRecently, we have described the correct theory of the quantum Hall effect as well as explained the origin of 101 fractions found in the experimental data [1]. The cyclotron frequency which appears in the Landau levels is replaced by double valued helical values. The Lande's formula is corrected to include the time-reversed conjugate states. Only the l =0 states are used in the original Landau theory which requires to be modified for finite l value. Since j=l ±s is the total angular momentum keeping only l = 0 leaves out the important effects at high fields. The energy levels which result by these corrections lead to the fractions in the flux-quantized resistivity measured in the Hall effect. The concept of helicity is introduced to understand the right and left moving electrons. Usually the velocity is single valued except that in complex clusters there are rotations which allow two signs of the velocity. Hence, as long as charge is conserved particles can occur with reversed helicity. In a single particle this will not happen but in a cluster it is possible.In this paper, we describe the concept of helicity as applied to the quantum Hall effect of electrons in a high magnetic field and low temperatures and also explain the experimental data of fractions in the Hall effect of graphite and graphene. We look for the evidence of the mixed helicity as well as "reversed helicity". We analyze the experimental data of the quantum Hall effect measurements of noise power to look for the effect of helicity. We find that noise power depends on the helicity. It is possible to heat the samples by a heater wire and monitor the motion of the particles. Hence we explain that while one particle moves to the right, the conjugate will move to the left. This motion of the particles is controlled by the helicity. Hence all particles occur in pairs. The original observation of the quantum Hall effect by von Klitzing et al [2] and Tsui et al. [3] had no theory and the efforts of Laughlin [4] did not yield an interpretation of the data and comparisons with the one-component plasma did not find the ground state...

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“…The phenomena have been observed in many systems such as quantum wells [3,4], metallic photonic crystal slabs [5], Ag-Pd film [6], single walled carbon nanotube film [7], graphene [8] and spongy nanoporous gold thin film [9]. The phenomenon has been ascribed to different mechanisms including circular photogalvanic effect, circular photon drag effect [8] and circular ac Hall effect [10].…”

Section: Introductionmentioning

confidence: 99%

“…The phenomenon has been ascribed to different mechanisms including circular photogalvanic effect, circular photon drag effect [8] and circular ac Hall effect [10].…”

Section: Introductionmentioning

confidence: 99%

Polarization dependence of transverse photo-induced voltage in gold thin film with random nanoholes

Akbari¹,

Ishihara²

2017

Opt. Express

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Transverse photo-induced voltage (TPIV) in 25nm-thick Au film with random holes with 100 nm in diameter is measured for linearly, circularly and elliptically polarized light. By rotating the major axis of ellipse of the light, TPIV exhibits specific pattern depending on polarization. The experimental results are readily reproduced by assuming that the angular momentum transfer from the light beam to the film is responsible for TPIV. A novel ellipticity meter is proposed based on this mechanism.

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Helicity-dependent photocurrents in graphene layers excited by midinfrared radiation of a CO2laser

Cited by 98 publications

References 39 publications

Polarization-dependent photocurrents in polar stacks of van der Waals solids

Polarization-dependent photocurrents in polar stacks of van der Waals solids

The Quantum Hall Effect: Helicity, Graphite and Graphene

Polarization dependence of transverse photo-induced voltage in gold thin film with random nanoholes

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