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Superlattices: problems and new opportunities, nanosolids.

Tsu R - Nanoscale Res Lett (2011)

Bottom Line: Superlattice is simply a way of forming a uniform continuum for whatever purpose at hand.However, new opportunities in component-based nanostructures may lead the field of endeavor to new heights.The all important translational symmetry of solids is relaxed and local symmetry is needed in nanosolids.

View Article: PubMed Central - HTML - PubMed

Affiliation: University of North Carolina at Charlotte, Charlotte, NC 28223 USA. Tsu@uncc.edu.

ABSTRACT
Superlattices were introduced 40 years ago as man-made solids to enrich the class of materials for electronic and optoelectronic applications. The field metamorphosed to quantum wells and quantum dots, with ever decreasing dimensions dictated by the technological advancements in nanometer regime. In recent years, the field has gone beyond semiconductors to metals and organic solids. Superlattice is simply a way of forming a uniform continuum for whatever purpose at hand. There are problems with doping, defect-induced random switching, and I/O involving quantum dots. However, new opportunities in component-based nanostructures may lead the field of endeavor to new heights. The all important translational symmetry of solids is relaxed and local symmetry is needed in nanosolids.

No MeSH data available.


Conductance oscillations between G1 and G2 at biases: -11.95 V. (a) Near Vn+1; and -11.85 V, (b) near Vn, the voltage arbitrarily assigned on G versus bias voltage.
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Figure 3: Conductance oscillations between G1 and G2 at biases: -11.95 V. (a) Near Vn+1; and -11.85 V, (b) near Vn, the voltage arbitrarily assigned on G versus bias voltage.

Mentions: When many Quantum Dots are coupled under one contact, due to the good coupling between the wave functions of the QDs to the wave functions of the defects, uncontrollable oscillations referred to as telegraph noise appeared. Figure 3 shows a typical case of many Si-QDs with size approximately 3 nm. The switching speed changes from approximately 2 s to more than 10 s. Note that ΔG = G2 - G1 = 420 - 260 μS = 160 μS - 4G0, indicating that 4 electrons participated in the conduction process. We have observed oscillations lasting for an entire day. But, in some cases oscillation stops after only 900 s as if we have used up the QDs involved [18].


Superlattices: problems and new opportunities, nanosolids.

Tsu R - Nanoscale Res Lett (2011)

Conductance oscillations between G1 and G2 at biases: -11.95 V. (a) Near Vn+1; and -11.85 V, (b) near Vn, the voltage arbitrarily assigned on G versus bias voltage.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211173&req=5

Figure 3: Conductance oscillations between G1 and G2 at biases: -11.95 V. (a) Near Vn+1; and -11.85 V, (b) near Vn, the voltage arbitrarily assigned on G versus bias voltage.
Mentions: When many Quantum Dots are coupled under one contact, due to the good coupling between the wave functions of the QDs to the wave functions of the defects, uncontrollable oscillations referred to as telegraph noise appeared. Figure 3 shows a typical case of many Si-QDs with size approximately 3 nm. The switching speed changes from approximately 2 s to more than 10 s. Note that ΔG = G2 - G1 = 420 - 260 μS = 160 μS - 4G0, indicating that 4 electrons participated in the conduction process. We have observed oscillations lasting for an entire day. But, in some cases oscillation stops after only 900 s as if we have used up the QDs involved [18].

Bottom Line: Superlattice is simply a way of forming a uniform continuum for whatever purpose at hand.However, new opportunities in component-based nanostructures may lead the field of endeavor to new heights.The all important translational symmetry of solids is relaxed and local symmetry is needed in nanosolids.

View Article: PubMed Central - HTML - PubMed

Affiliation: University of North Carolina at Charlotte, Charlotte, NC 28223 USA. Tsu@uncc.edu.

ABSTRACT
Superlattices were introduced 40 years ago as man-made solids to enrich the class of materials for electronic and optoelectronic applications. The field metamorphosed to quantum wells and quantum dots, with ever decreasing dimensions dictated by the technological advancements in nanometer regime. In recent years, the field has gone beyond semiconductors to metals and organic solids. Superlattice is simply a way of forming a uniform continuum for whatever purpose at hand. There are problems with doping, defect-induced random switching, and I/O involving quantum dots. However, new opportunities in component-based nanostructures may lead the field of endeavor to new heights. The all important translational symmetry of solids is relaxed and local symmetry is needed in nanosolids.

No MeSH data available.