Resonant-energy relaxation of terahertz-driven two-dimensional electron gases

Asmar, N. G.; Markelz, Andrea; Gwinn, E. G.; Černe, J.; Sherwin, Mark S.; Campman, K. L.; Hopkins, P. F.; Gossard, A. C.

doi:10.1103/physrevb.51.18041

Cited by 111 publications

(83 citation statements)

References 5 publications

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“…In contrast to the experimental measurements carried out only recently in the THz regime, 4,5 there exist a number of theoretical studies on high-frequency ac response of semiconductor materials. Important contributions have been made by some authors.…”

Section: Introductionmentioning

confidence: 93%

Nonlinear transport in steady-state terahertz-driven two-dimensional electron gases

Zhang

1997

Phys. Rev. B

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We present a detailed theoretical study on nonlinear transport and optical properties in two-dimensional semiconductor systems ͑2DSS's͒ subjected to intense terahertz electromagnetic fields. By solving the momentum-and energy-balance equations using a steady-state Boltzmann equation approach, where electron interaction with LO phonons is taken into account under the lowest-order approximation for GaAs-based 2DSS's, we have investigated the dependence of electron temperature, momentum relaxation time, and conductivity on the intensity and frequency of THz radiation fields. The results obtained from this study are in line with those obtained from recent experimental measurements ͓N. G. Asmar et al., Appl. Phys. Lett. 68, 829 ͑1996͔͒. ͓S0163-1829͑97͒04308-7͔

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Section: Introductionmentioning

confidence: 93%

Nonlinear transport in steady-state terahertz-driven two-dimensional electron gases

Zhang

1997

Phys. Rev. B

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“…State-of-the-art growth techniques, such as molecular-beam epitaxy ͑MBE͒ and metalorganic chemical-vapor deposition ͑MOCVD͒, can confine the conducting electrons in a LDSS within the nanometer distance scale, so that the energies ͑e.g., electronic subband energy, electron kinetic energy, Fermi energy, etc.͒ are on the meV scale and, consequently, the energy ͑frequency͒ of the acoustic phonons generated can reach the meV ͑THz͒ scale. Additionally, the emission and absorption of polaroptical phonons by hot electrons are very sensitive to THz electromagnetic radiation, which has been observed experimentally 8 very recently. The investigation of the generation, propagation, and detection of THz electromagnetic and ultrasonic waves has recently become an important research field because of the potential device applications.…”

Section: Introductionmentioning

confidence: 99%

“…8 The experimental results obtained from ͑i͒ only give integrated information regarding the overall strength of the process of electron energy relaxation. In contrast, the phonon emission experiments measure directly the frequency and angular distribution for generating different phonon modes and, therefore, give more detailed information about the electronphonon interaction.…”

Section: Introductionmentioning

confidence: 99%

Emission of acoustic and optical phonons by hot electrons in a two-dimensional electron system in parallel magnetic fields

1996

Phys. Rev. B

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In this paper, we present a detailed theoretical study on acoustic-and optical-phonon emission by hot electrons in Al x Ga 1Ϫx As parabolic quantum wells in parallel magnetic fields. We consider the situation where the phonon generation is detected by phonon emission experiments. The dependence of phonon emission on the magnetic field, excitation power, and phonon emission angle has been studied through calculating the electron energy loss rate in this configuration. The main results obtained from the present theoretical study are the following. ͑i͒ In low-, intermediate-, and high-energy excitations, phonon generation is mainly through electron-phonon interaction via piezoelectric, deformation-potential, and polar-optical coupling, respectively. ͑ii͒ The strongest acoustic-phonon emission can be observed around a magnetic field at which an electronic subband becomes depopulated, and the strongest LO-phonon emission occurs around a magnetic field where the energy spacing between two subbands equals the LO-phonon energy ͑electrophonon resonance effect͒. ͑iii͒ Phonon generation in the presence of parallel magnetic fields has a different angular distribution from that at zero and perpendicular magnetic fields.͓S0163-1829͑96͒016619-0͔

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“…[3][4][5][6][7][8][9][10] Terahertz lasers have been applied to the experimental investigation of nonlinear transport and optical properties in electron gases such as low-dimensional semiconductor systems. Many interesting terahertz phenomena have been investigated, including resonant absorption, 3 photon enhanced hot-electron effect, 6 terahertz photon-induced impact ionization, 7 LO-phonon bottleneck effect, 8 terahertz photon assisted tunneling, 9 terahertz cyclotron resonance, 10 terahertz switching effects in tunneling diodes. [11][12][13] The conductivity changes due to an ac field radiation were calculated using a perturbative method.…”

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confidence: 99%

Frequency-dependent electrical transport under intense terahertz radiation

Zhang

2002

Phys. Rev. B

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Resonant-energy relaxation of terahertz-driven two-dimensional electron gases

Cited by 111 publications

References 5 publications

Nonlinear transport in steady-state terahertz-driven two-dimensional electron gases

Nonlinear transport in steady-state terahertz-driven two-dimensional electron gases

Emission of acoustic and optical phonons by hot electrons in a two-dimensional electron system in parallel magnetic fields

Frequency-dependent electrical transport under intense terahertz radiation

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