Electron population inversion in photon-assisted tunneling through a quantum wire

Niu, C.; Lin, D. L.

doi:10.1103/physrevb.56.r12752

Cited by 9 publications

(13 citation statements)

References 13 publications

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“…The choice of these typical parameters is based on the following consideration. 22 Usually the strength of electron-photon interaction depends on the photon intensity, polarization and the size of the quantum wire. Under the irradiation of a strong laser with an electric field of the order (10 5 − 10 6 ) V /m, the MEs are comparable to or several times larger than the level spacing in the quantum wire with the width of order (10 − 100) nm (corresponding to the external laser frequency ∼ THz), and these quantities are physically realizable in recent experiments.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…The NGF approach has been employed in last decades to study a variety of problems beyond the linear response regime. 22 Meir et al 24 derived a formula for the current through a region of interacting electrons using the NKF. Changing the one-direction time axis into a loop with two branches, four Green's functions depending on the relative positions of t a and t b in the loop can be defined.…”

Section: Model and Formalismmentioning

confidence: 99%

“…and ∆ so = h2 k 2 so /2m. In Hamiltonian (6), the coupling between the electrode leads and the wire with strength T α kkxns is represented by the third term, and the last term describes the adiabatical electron-photon interaction in the wire 22,26 and the mixture of transverse modes due to SOC, where V nsn ′ s ′ are the dipole electron-photon interaction matrix elements (MEs) and Ω the incident laser frequency. Since the frequencies of interest are in the range corresponding to wavelengths of the order of hundreds of nanometers, the spatial variation of the field potential can be neglected.…”

Section: Model and Formalismmentioning

confidence: 99%

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Electronic structure and transport for a laser-field-irradiated quantum wire with Rashba spin–orbit coupling

Zhou¹,

Liao²

2006

J. Phys.: Condens. Matter

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We investigate theoretically the electronic structure and transport for a two-level quantum wire with Rashba spin-orbit coupling (SOC) under the irradiation of an external laser field at low temperatures. The photon-induced transitions between SOC-splitted subbands with the same lateral confinement quantum numbers and between subbands with different confinement quantum number are expected. Using the method of equation of motion (EOM) for Keldysh nonequilibrium Green's functions (NGF), we examine the time-averaged density of states (DOS) and the spin polarized conductance for the system with photon polarization perpendicular to the wire direction. Through the analytical analysis and some numerical examples, the interplay effects of the external laser field and the Rashba SOC on both the DOS and the conductance of the system are demonstrated and discussed. It is found that the external laser field can adjust the spin polarization rate and the transport of the quantum wire system with some proper Rashba SOC strengths.

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Section: Numerical Results and Discussionmentioning

confidence: 99%

Section: Model and Formalismmentioning

confidence: 99%

Section: Model and Formalismmentioning

confidence: 99%

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Electronic structure and transport for a laser-field-irradiated quantum wire with Rashba spin–orbit coupling

Zhou¹,

Liao²

2006

J. Phys.: Condens. Matter

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“…Electronic transport under the influence of time-varying external fields is one of the interesting areas. Transport phenomena in the presence of photons have been intensively studied in many mesoscopic systems [5][6][7][8][9][10][11][12][13][14]. Among the various quantum confined geometries to characterize the photon-assisted features are, for example, a quantum ring with an embedded dot for exploring mono-parametric quantum charge pumping [7], a single QD for investigating single-electron (SE) tunneling [8], a quantum wire for studying electron population inversion [9], and a quantum point contact involving photon-induced intersubband transitions [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…Transport phenomena in the presence of photons have been intensively studied in many mesoscopic systems [5][6][7][8][9][10][11][12][13][14]. Among the various quantum confined geometries to characterize the photon-assisted features are, for example, a quantum ring with an embedded dot for exploring mono-parametric quantum charge pumping [7], a single QD for investigating single-electron (SE) tunneling [8], a quantum wire for studying electron population inversion [9], and a quantum point contact involving photon-induced intersubband transitions [10,11]. Recently, the electrical properties of double QD systems influenced by electromagnetic irradiation have been studied [12,13], indicating a spin-filtering effect [12], and two types of photon-assisted tunneling related to the ground state and excited state resonances [13].…”

Section: Introductionmentioning

confidence: 99%

Electron transport through a quantum dot assisted by cavity photons

Abdullah

Tang

Manolescu

et al. 2013

J. Phys.: Condens. Matter

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We investigate transient transport of electrons through a single quantum dot controlled by a plunger gate. The dot is embedded in a finite wire with length Lx assumed to lie along the x-direction with a parabolic confinement in the y-direction. The quantum wire, originally with hard-wall confinement at its ends, ±Lx/2, is weakly coupled at t = 0 to left and right leads acting as external electron reservoirs. The central system, the dot and the finite wire, is strongly coupled to a single cavity photon mode. A non-Markovian density-matrix formalism is employed to take into account the full electron-photon interaction in the transient regime. In the absence of a photon cavity, a resonant current peak can be found by tuning the plunger-gate voltage to lift a many-body state of the system into the source-drain bias window. In the presence of an x-polarized photon field, additional side peaks can be found due to photon-assisted transport. By appropriately tuning the plunger-gate voltage, the electrons in the left lead are allowed to undergo coherent inelastic scattering to a two-photon state above the bias window if initially one photon was present in the cavity. However, this photon-assisted feature is suppressed in the case of a y-polarized photon field due to the anisotropy of our system caused by its geometry.

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Oscillations in electron transport caused by multiple resonances in a quantum dot-QED system in the steady-state regime

Abdullah

Tang²,

Manolescu³

et al. 2020

Physica E: Low-dimensional Systems and Nanostructures

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Electron population inversion in photon-assisted tunneling through a quantum wire

Cited by 9 publications

References 13 publications

Electronic structure and transport for a laser-field-irradiated quantum wire with Rashba spin–orbit coupling

Electronic structure and transport for a laser-field-irradiated quantum wire with Rashba spin–orbit coupling

Electron transport through a quantum dot assisted by cavity photons

Oscillations in electron transport caused by multiple resonances in a quantum dot-QED system in the steady-state regime

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