In graphene, which has a pair of Dirac points, the photovoltaic Hall effect should take place when (i) the Berry curvature becomes non-zero, and (ii) the occupation fraction for the K and K’ points become asymmetric. The typical strength of the AC electric field that is needed is F=107 V/m for photon energy of Ω =O(0.1) eV.
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Response of electronic systems in intense lights (AC electric fields) to DC source-drain fields is formulated with the Floquet method. We have then applied the formalism to graphene, for which we show that a non-linear effect of a circularly polarized light can open a gap in the Dirac cone, which leads to a photo-induced dc Hall current. This is numerically
To summarize, we have found that a combined effect of an intense AC field of a circularly polarized light and a (weak) DC bias can produce a photo-voltaic dc Hall current in graphene,
We propose an all optical way to measure the recently proposed "photovoltaic Hall effect", i.e., a Hall effect induced by a circularly polarized light in the absence of static magnetic fields. We also point out the possibility of observing the effect in two layered graphene, three-dimensional graphite, and more generally in multi-band
The spin Hall effect of light, known as the photonic spin Hall effect, is a polarization-dependent separation between the left-handed circular polarization (LHCP) and the right-handed circular polarization (RHCP) of a light beam at the optical interface. It is interpreted as a direct optical analog of the electronic spin Hall effect [1], [2].
We note that the photovoltaic Hall effect of two-dimensional (2D) Dirac fermions (for example, in graphene) has also been studied as a topological phenomenon (23–27), where the circularly polarized light induces Hall conductance σ xy proportional to E 2. In this case, the current J is the third-order effect, that is, ∝ E 3.
Artificial corrugations in bilayer graphene can produce a nonlinear anomalous Hall effect that originates from the Berry curvature dipole and a linear Hall effect that originates from a warped
A monolayer of graphene irradiated with circularly polarized light suggests a unique platform for surface electromagnetic wave (plasmon-polariton) manipulation. In fact, the time periodicity of the Hamiltonian leads to a geometric Aharonov-Anandan phase and results in a photovoltaic Hall effect in graphene, creating off-diagonal components of the conductivity tensor.
Graphene exhibits exciting potentials for high-speed wideband photodetection and high quantum efficiency solar energy harvest because of its broad spectral absorption, fast photoelectric response, and potential carrier multiplication. Although photocurrent can be generated near a metal–graphene interface in lateral devices, the photoactive area is usually limited to a tiny
We propose an experimental realization of the Spin Hall effect in graphene by illuminating a graphene sheet on top of a substrate with circularly polarized monochromatic light.
We study theoretically transverse photoconductivity induced by circularly polarized radiation, i.e., the photovoltaic Hall effect, and linearly polarized radiation causing intraband optical transitions in the two-dimensional electron gas (2DEG). We develop a microscopic theory of these effects based on the analytical solution of the Boltzmann equation
Inducing and detecting anomalous Hall currents in graphene presents multiple experimental challenges. The laser electric field strength required to open an observable topological gap is estimated to be of the order of 10 7 –10 8 V m −1, even at mid-infrared wavelengths where the effect is enhanced 4, 5, 15.
Photodetectors based on graphene and other 2D materials have usually been demonstrated with either photoconductor or photodiode mode [2] nefited from a large number of photo-carriers provided by the ultimate light absorbance and the ultra-high gain of the graphene channel [9], 2D photoconductors generally have a very high photo-responsivity [10], but with
Photovoltaic Hall effect in graphene. Response of electronic systems in intense lights (ac electric fields) to dc source-drain fields is formulated with the Floquet method. We
Photovoltaic Hall effect in graphene. T Oka, H Aoki. Physical Review B 79 (8), 081406, 2009. 1493: 2009: Transport properties of nonequilibrium systems under the application of light: Photoinduced quantum Hall insulators without Landau levels. T
Here, we report the observation of a light-induced anomalous Hall effect in monolayer graphene driven by a femtosecond pulse of circularly polarized light.
We have then applied the formalism to graphene, for which we show that a nonlinear effect of a circularly polarized light can open a gap in the Dirac cone, which is predicted to lead to a photoinduced dc Hall current. This is numerically confirmed for a graphene ribbon
We have then applied the formalism to graphene, for which we show that a nonlinear effect of a circularly polarized light can open a gap in the Dirac cone, which is predicted to lead to a photoinduced dc Hall current. This is numerically confirmed for a graphene ribbon attached to electrodes with the Keldysh Green''s function.
Graphene (Gr)/Si-based optoelectronic devices have attracted a lot of academic attention due to the simpler fabrication processes, low costs, and higher performance of their two-dimensional (2D)/three-dimensional (3D) hybrid interfaces in Schottky junction that promotes electron-hole separation. However, due to the built-in potential of Gr/Si as a photodetector, the
When electrons are confined in two-dimensional materials, quantum-mechanically enhanced transport phenomena such as the quantum Hall effect can be observed. Graphene, consisting of an isolated
We note that a similar expression was obtained in the case where the chirality is broken in a static manner.20 To summarize, we have found that a combined effect of an intense ac field of a circularly polarized light and a weak dc bias can produce a photovoltaic dc Hall current in graphene, despite the absence of a uniform magnetic field.
we have calculated the transport going back to the honeycomb lattice, and the main conclusion of the paper on the photovoltaic Hall effect is not altered in any way. k x k y −π π π 0 −π 20 40 FIG. 1. Color online The photoinduced Berry curvature k A k z in the honeycomb lattice for the upper band for F=0.1w, =1.0w. PHYSICAL REVIEW B 79
The photoresponse of graphene-based photodetectors is dominated by photovoltaic and photothermoelectric effects. Here, the authors leverage strongly localised plasmonic heating of graphene
We calculate the classic Hall conductivity and mobility of the undoped and doped (or at the gate voltage) graphene as a function of temperature, magnetic field, and carrier concentration. Carrier collisions with defects and acoustic phonons are taken into account. The Hall resistivity varies almost linearly with temperature below the Debye temperature. The
We note that the photovoltaic Hall effect of two-dimensional (2D) Dirac fermions (for example, in graphene) has also been studied as a topological phenomenon (23–27), where the circularly polarized light induces Hall conductance σ xy
We study the orbital Hall effect (OHE) in the AC regime using bilayer graphene (BLG) as a prototypical material platform. While the unbiased BLG has gapless electronic spectra, applying a perpendicular electric field creates an energy band gap that can be continuously tuned from zero to high values. By exploiting this flexibility, we demonstrate the ability to control the
The problem of graphene in the presence of circularly polarized light was tackled by Oka and Aoki in the context of the appearance of a photovoltaic Hall effect . They used the Floquet method [ 54 – 56 ] to solve the Schrödinger equation for the time-periodic Hamiltonian of equation ( 1 ) with .
Photovoltaic Hall effect ? the Hall effect induced by intense, circularly-polarized light in the absence of static magnetic fields ? has been proposed in Phys. Rev. B 79, 081406R (2009) for graphene We propose a device for the generation of valley polarized electronic current in bilayer graphene.
For graphene,6,7 which is dominated by the chirality, we conclude that a photoinduced Hall current despite the absence of uniform magnetic fields should appear in graphene irradiated by cir-cularly polarized light and attached to two electrodes, where the Hall current can exceed the longitudinal current in mag-nitude. II.
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