Tunneling spectroscopy in barrier-separated two-dimensional electron-gas systems

Demmerle, W.; Smoliner, J.; Berthold, G.; Gornik, E.; Weimann, G.; Schlapp, W.

doi:10.1103/physrevb.44.3090

Cited by 55 publications

(33 citation statements)

References 42 publications

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“…We hope that the presented here results will initiate an interest of experimentalists to fabricate shorter than in [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] ballistic overlap structures, as well as to the cover structures, which have not implemented yet. ϭ(k 1 ϩk 2 )l, ␦ϭ1/2(k 1 Ϫk 2 )l is similar to (l) in Sec.…”

Section: Discussionmentioning

confidence: 91%

Double quantum well segments in ballistic diode bases

Gribnikov

Korshak

Mitin

1998

Journal of Applied Physics

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We consider space charge limited ballistic electron transport in short current-conducting channels formed by single and double quantum well segments. Independent contacts to the bottom-well and the top-well forming the double quantum well segment is stipulated. Three different structures are simulated: a resonant overlap structure, a resonant cover structure, and a coupler structure. It is shown that anode currents in these structures oscillate with increasing voltage across the structure, resulting in repeatedly N-shaped current–voltage (I–V) characteristics. A modulation level of the current oscillations is close to 100%. The shape of these oscillations is substantially asymmetric both for the overlap and the cover structures. The asymmetry is due to a very strong nonlinear space charge modulation, and N-shaped parts of I–V characteristics can become Z-shaped when a strong tunnel connection in the double quantum well segment takes place. In the coupler structure the modulation of partial anode currents flowing out through each of two anodes, which are independently contacted to the bottom-well and the top-well, occurs only. The space charge increases monotonously with the voltage. Justification criteria of the classic approach used in our calculations are discussed in detail.

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Section: Discussionmentioning

confidence: 91%

Double quantum well segments in ballistic diode bases

Gribnikov

Korshak

Mitin

1998

Journal of Applied Physics

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“…The presence of elastic scattering, on the other hand, leads to the inter-LL tunneling peaks used to re-scale the V b -axis. The corresponding tunneling transitions would be forbidden if energy and momentum were exactly conserved during a resonant tunneling process [12].…”

Section: D-1d Tunnelingmentioning

confidence: 99%

“…In the calculation a Gauss curve is assigned to each tunneling transition between two LLs according to the results given in Ref. [12]. Each resonance occurs at a certain voltage drop V * b across the barrier, where the corresponding LLs are energetically aligned.…”

Section: D-1d Tunnelingmentioning

confidence: 99%

Tunneling spectroscopy of voltage tunable quantum wires

Ploner

Gornik

2000

Superlattices and Microstructures

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“…In this geometry, the electrons transverse momentum (with respect to the tunneling current) is conserved during the tunneling process. Re8onant tunneling occurs each time the subband in the accumulation layer matches energetically a subband in the inversion layer [12,13]. With increasing temperature up to T = 30 K all structures remain almost unchanged.…”

Section: D-2d Tunnelingmentioning

confidence: 99%

Electrical and Optical Characterization of Nanostructures

1995

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The characterization of nanostructures is a topic of vital interest, since the dimensions of commercially available semiconductor devices are now in a range, where quantum size effects become evident. In this paper, various methods are presented to characterize low-dimensional structures. Magnetic depopulation, tunneling, far infrared transmission, photo-conductivity and magnetophonon resonances are used to determine the low-dimensional subband energies. For each method, the special features are discussed and it is demonstrated that the different methods yield dicherent, complementary information.

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Tunneling spectroscopy in barrier-separated two-dimensional electron-gas systems

Cited by 55 publications

References 42 publications

Double quantum well segments in ballistic diode bases

Double quantum well segments in ballistic diode bases

Tunneling spectroscopy of voltage tunable quantum wires

Electrical and Optical Characterization of Nanostructures

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