Resonant tunneling the quintessential resonanttunneling device is the resonant tunneling diode rtd, which can be described as a quantum well with electrically leaky barriers. However, it should be noted that the interaction with phonons might be. Theoretical investigation of the resonant tunneling phenomena. Using quantum confinement to uniquely identify devices. Mounaix et alto observed the resonant tunneling from the localized states in the accumulation layer, and jogai et al. The resonant tunneling through graphenebased double barriers has been studied by pereira et al. The preceding discussion has dealt with the bulkcarrier tunneling into a 2d density of electronic states.
Tunneling has revolutionized surface science by its utilization in scanning tunneling microscopes. Resonanttunneling diode wikipedia, the free encyclopedia. The tunneling barriers have openings 430 of size smaller than the electron wave packet spread to insure crystal alignment through the diode without affecting the tunneling barrier height, and the openings 430 have an irregular nonperiodic shape. By combining rtds with ntype transistors of conventional com plementarymetal oxide semiconductor cmos devices, a new quantum mos qmos familyof. Pdf the resonant tunneling diode rtd has been widely studied because of its importance in the.
This structure is typically formed epitaxially by the precise growth of dissimilar semiconductor materials to produce energy band discontinuities at the layer interfaces. Resonant tunneling of doublebarrier quantum wells affected. Gainnasgaas quantum well, we present a low dimensional, wide range. Henry tye september 18, 2009 dan wohns resonant tunneling in quantum field theory 6. A lienard oscillator resonant tunnelling diodelaser diode hybrid integrated circuit. Capasso and myself proposed a novel emitter 1 contact fig. From resonant tunneling diodes to quantum cascade lasers.
Alasgaas double barrier resonant tunneling diodes 4. This article describes a model for resonant tunneling diodes rtds implemented within atlas framework. A comparison of the i v curves of the edge 2deg device and a representative bulk device is shown in fig. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that. Resonant tunneling diodes rtds have been a subject of considerable interest among scientists. From the device application stand point, frequency response is very important, which is also affected significantly by the reservoir interact device physics, a brief discussion of the concepts governing resonant tunneling diodes is also included. This process is experimental and the keywords may be updated as the learning algorithm improves. The resonant tunneling diode rtd is a doublebarrier device that can sustain an electronic oscillation at high frequencies suzuki et al. This is a quantum device not to be confused with the esaki tunnel diode, ch 3, a conventional heavily doped bipolar semiconductor.
Resonant tunneling can be described by the transmission and reflection processes of coherent electron waves through the. Finally, we evidence strong asymmetry in the transmission. All types of tunneling diodes make use of quantum mechanical tunneling. Winner of the standing ovation award for best powerpoint templates from presentations magazine. Wie state university of new york at buffalo, department of electrical,and computer engineering and iiiv semiconductor materials and devices laboratory, bonner hall, bufialo, new york 14260. Theoretical investigation of the resonant tunneling. Thus, one can say that the fundamental requirement for this process. Resonant tunneling times in superlattice structures. Experiments below 100 k reveal conductance oscillations in the measured tunneling current and point to resonant transport through discrete unoccupied electronic states confined to the wall 4, 184. The resonant tunneling diode rtd has been widely studied because of its. We show that a nonresonant laser beam, focused ontothe island, can modulate thertdtransmissionwithapeaktovalleyratioashighas 28. However, instead of the current going through a channel. Piecewise constant potential barrier tool matlab code. The currentvoltage characteristic often exhibits negative differential resistance regions all types of tunneling diodes make use of quantum mechanical tunneling.
Us5606177a silicon oxide resonant tunneling diode structure. In addition to this, quantum oscillation is seen when the resonant tunneling condition is fulfilled f. The nonlinear transmission line nltl steepens the wavefront of a microwave source and compresses the wavefront. The effect is interpreted in terms of the formation of spinpolarized resonant tunneling. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. Physics and applications of resonant tunneling devices. Color image processing with multipeak resonant tunneling diodes 18.
The resonanttunneling diode has also been used in fast pulseforming circuits and trigger circuits. A familiar fact in the realm of physics is that on very small size scales, some of the. Applications of rtds zseveral applications exploit negative differantial resistance ndr of rtds zresonant tunneling transistors to make a three terminal tunneling device rtds are merged with conventional transistors and resonant tunneling bipolar transistors, resonant tunneling hot electron transistors and. As to quantummechanical resonant tunneling, we shall compare our results with ref. Gaas or gan limited by two barriers made of semiconductor b with a higher conduction band potential energy es. Ndr to occur in a resonant tunneling structure is the reduced dimensionality of electronic states. Resonant tunneling an overview sciencedirect topics. Where there is a reverse bias voltage, the current becomes extremely large. As seen, the process of resonant tunneling implies the existence of metastable states in the potential barrier region. If the structure includes an emitter spacer layer with its con. The physics of ndr region is based on quantum electron tunneling from the emitter to the energy level in the cen. Resonant interband tunneling diodes ritds combine the structures and behaviors of both intraband resonant. Introduction over the past two decades, resonant tunneling diodes rtds have received a great deal of attention following the pioneering work by esaki and tsu 1.
Resonant tunnelling and negative differential conductance in. The model is based on a selfconsistent solution of poisson and nonequilibrium greens function negf equations with an effective mass hamiltonian. Resonant tunneling diode rtd rtd, resonant tunneling diode. Ppt resonant tunneling diodes rtds powerpoint presentation. A resonant tunneling diode 400 made of a silicon quantum well 406 with silicon oxide tunneling barriers 404, 408. Resonant tunneling devices on soi basis springerlink. Resonant tunneling through doublebarrier structures on. Realization of a doublebarrier resonant tunneling diode for. The simplified 3d view of the device constructed by lumerical software fig.
Jul 12, 2002 insertion of a thin nonmagnetic copper cu001 layer between the tunnel barrier and the ferromagnetic electrode of a magnetic tunnel junction is shown to result in the oscillation of the tunnel magnetoresistance as a function of the cu layer thickness. This will serve as a starting point for the optimization of such ir lasers. A resonanttunneling diode rtd is a diode with a resonanttunneling structure in which electrons can tunnel through some resonant states at certain energy levels. Resonant tunneling of doublebarrier quantum wells affected by interface roughness e.
This thesis addresses several important issues of the physics and applications of double barrier resonant tunneling devices on which the author worked during his graduate study at caltech. Figure 3 showing data for another transistor, device b, illustrates the reproducibility of the iv characteristics for different devices and. Jiang department ofphysics, cardwell hall, kansas state university, manhattan, kansas 66506 received 17 april 1989. The proposal 1 and later confirmation 2 of the resonant tunneling concept led to the investigation of double barrier structures for various applications. Iv characteristic of a resonant tunneling diode top and side view and top view of the multipeak rtdbased image processor bottom. Resonant tunneling in doublequantumwell triplebarrier. In some device applications tunneling is required for the operation of the device resonant tunneling diodes. Resonant tunnelling and negative differential conductance. Electrons tunnel through two barriers separated by a well in flowing source to drain in a resonant tunneling diode. Resonance width control voltage resonant tunneling resonant tunneling diode resonator length these keywords were added by machine and not by the authors. Resonant tunneling through doublebarrier structures. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. Threebarrier, twowell resonant tunneling structure.
Occurs when an electron passes through a potential barrier without having enough energy to do so. Quantum devices solidstate device theory electronics. Figure 3 shows the electron density distribution near the barrier in the electrode i. Insertion of a thin nonmagnetic copper cu001 layer between the tunnel barrier and the ferromagnetic electrode of a magnetic tunnel junction is shown to result in the oscillation of the tunnel magnetoresistance as a function of the cu layer thickness. Theory we assume for our resonant structures that the incoherent electron scattering, spacecharge effects, manyelectron effects and phononassisted tunneling are neglected. Same device covers from the optics to the electronics. This property finds numerous applications in ultrafast circuits, amplifiers, oscillators, frequency converters, etc. A resonanttunneling diode rtd is a diode with a resonanttunneling structure in which. Elastic and inelastic tunneling processes have also been identi. Experiments below 100 k reveal conductance oscillations in the measured tunneling current and point to resonant transport through discrete unoccupied electronic states confined to. Resonant tunneling diodes rtd exhibit iv characteristics with a negative differential resistance ndr region. The resonant tunneling current will be calculated using the transfer matrix method. Tunneling is fully quantummechanical effect that does not have classical analog.
The currentvoltage characteristic often exhibits negative differential resistance regions. Resonant tunneling tunneling is a quantum mechanical phenomenon with no analogy in classical physics. The iv characteristics of the tunneling diode are shown in figure 2. Resonant tunneling device with multiple negative differential resistance. Johnny ling, university of rochester, rochester, ny 14627 brief overview of nanoelectronic devices, james c. Hagelstein research laboratory of electronics, massachusetts institute of technology, cambridge, ma 029,usa email. This report is a summary of the activities in the field of resonant tunneling device circuit design. Mechanism of operation of doublebarrier resonanttunneling. Increased peak current in alasgaas resonant tunneling. Analytical modeling of silicon based resonant tunneling diodes for. Theory of operation and applications johnny ling, university of. Thus, it should be interesting to combine both quantum devices.
The device is, therefore, operating as an optical gate. Realization of a doublebarrier resonant tunneling diode. A resonant tunneling structure consists of a thin qw made of a semiconductor a es. Resonant tunneling diodes could we try to improve on qcls learning from rtds. The report will include a theoretical treatment of the following aspects. A simplified explanation of the resonant tunnelling diode rtd as an oscillator.
Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. Paper 10ghz operation of multiplevalued quantizers using. Simulation of resonant tunneling diodes using atlas. Resonant tunneling diode is an important advancement to this problem. Government microelectronics applications conference gomac98. A resonant tunneling diode based monostable multivibrator. Color image processing with multipeak resonant tunneling. Resonant tunneling negative differential resistance ieee electron device resonant tunneling diode double barrier these keywords were added by machine and not by the authors. In recent years, resonant tunneling diode rtd has attracted growing interest on the applications of highly sensitive strain gauge.
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