Effect of a Transverse Magnetic Field on the Tunnel Current through Thick and Low Semiconductor Barriers

Guéret, P.; Baratoff, A.; Marclay, E.

doi:10.1209/0295-5075/3/3/019

Cited by 72 publications

(13 citation statements)

References 9 publications

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“…1 Further, the tunneling current is reduced by an increased effective barrier height. 2,3 Magnetoquantized interface states, corresponding to classical skipping orbits, were investigated on both InP-InGaAs (Refs. 4 and 5) and GaAs-AlGaAs (Ref.…”

Section: W Schlappmentioning

confidence: 99%

Momentum conservation in tunneling processes between barrier-separated 2D-electron-gas systems

et al. 1989

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We directly determine the momentum conservation rules for tunneling processes between two independently contacted two-dimensional-electron-gas systems on GaAs-GaAlAs heterostructures. In transverse magnetic fields, the conservation of the canonical momentum results in a new and giant broadening of the subband resonances. As a consequence, the mean values of the wave functions, even for nonoccupied subbands, can be determined directly.PACS numbers: 72.20. My, 73.20.Dx, 73.40.Gk Tunneling processes in transverse magnetic fields became a topic of increased interest in the last few years. In double-barrier heterostructures, it was found that the position of the negative differential resistance is shifted if a magnetic field is applied parallel to the plane of the barriers. 1 Further, the tunneling current is reduced by an increased effective barrier height. 2,3 Magnetoquantized interface states, corresponding to classical skipping orbits, were investigated on both InP-InGaAs (Refs. 4 and 5) and GaAs-AlGaAs (Ref. 6) single-barrier heterostructures. Resonant tunneling into so-called cycloidal interface states is also evident at high magnetic fields. 7 ' 8 At extremely high fields, an anticrossing of the energy levels on both sides of a tunneling barrier occurs, which is apparent as a new series of resonances in the tunneling current. 9 " 11 As an additional feature, the negative differential conductivity region in the current-voltage characteristics of double-barrier structures is washed out. 12 Basic calculations about tunneling in transverse magnetic fields 13 " 16 and hybrid magnetoelectric quantized states 17 ' 18 were also performed, since in narrow-gap semiconductors these states offer interesting possibilities for tunable light sources and far-infrared detectors.In order to investigate the momentum conservation rules, we have studied the tunneling processes between two independently contacted two-dimensional-electrongas systems, separated by a barrier of 200 A. Applying a bias voltage V^ across the barrier, the quantized states on both sides of the barrier are shifted energetically by eVb with respect to each other. All transitions between quantized states are reflected in the tunneling current directly. 19 In transverse magnetic fields, we observe a tremendous splitting of the subband resonances, being more than 1 order of magnitude larger than the cyclotron energy h(o c . This confirms that Landau levels are not involved in this effect.

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Section: W Schlappmentioning

confidence: 99%

Momentum conservation in tunneling processes between barrier-separated 2D-electron-gas systems

et al. 1989

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“…In this respect, the photonic experiments are very useful to study the question of tunnelling times, since experiments involving charged particle (e.g. electrons) are not yet sensible enough to measure transit times due to some technical difficulties [13]. From an experimental point of view, the transit time τ for a wave-packet propagating through a given region is measured as the interval between the arrival times of the signal envelope at the two ends of that region whose distance is D. In general, if the wave-packet has a group velocity v g , this means that τ = D/v g .…”

Section: Introductionmentioning

confidence: 99%

Universal photonic tunneling time

Esposito

2001

Phys. Rev. E

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We consider photonic tunnelling through evanescent regions and obtain general analytic expressions for the transit (phase) time τ (in the opaque barrier limit) in order to study the recently proposed "universality" property according to which τ is given by the reciprocal of the photon frequency. We consider different physical phenomena (corresponding to performed experiments) and show that such a property is only an approximation. In particular we find that the "correction" factor is a constant term for total internal reflection and quarter-wave photonic bandgap, while it is frequencydependent in the case of undersized waveguide and distributed Bragg reflector. The comparison of our predictions with the experimental results shows quite a good agreement with observations and reveals the range of applicability of the approximated "universality" property.

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“…This dispute is largely semantic, of course, as recent experiments have unequivocally shown that in measurements of arrival time, the group delay is indeed the significant observable quantity [8]. Other experiments, designed specifically to study the effects of interactions, seem best described by the Büttiker-Landauer timescales [5,[9][10][11][12][13] We are thus left in the uncomfortable situation of being unable to identify a unique timescale for tunneling, which forces us to analyse each conceivable experimental situation separately. The continued work on tunneling times is largely driven by the hope that this potentially infinite number of timescales can be reduced to a manageably finite handful of definitions, whose relationships and physical significances can be pinned down precisely.…”

Section: The Not-so-brief History Of Tunneling Timesmentioning

confidence: 99%

Time and history in quantum tunneling

Steinberg

1998

Superlattices and Microstructures

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Effect of a Transverse Magnetic Field on the Tunnel Current through Thick and Low Semiconductor Barriers

Cited by 72 publications

References 9 publications

Momentum conservation in tunneling processes between barrier-separated 2D-electron-gas systems

Momentum conservation in tunneling processes between barrier-separated 2D-electron-gas systems

Universal photonic tunneling time

Time and history in quantum tunneling

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