Download PDF by (auth.), B. Kramer (eds.): Electronic Transport. Part 1: Quantum Point Contacts and

By (auth.), B. Kramer (eds.)

ISBN-10: 3540617418

ISBN-13: 9783540617419

ISBN-10: 3540699899

ISBN-13: 9783540699897

This sequence of Landolt-Börnstein volumes is summarizing our present wisdom of the phenomena of mesoscopic quantum structures with spatial extensions among these of atoms and usual macroscopic solids. At low temperatures, they're acknowledged to turn into "quantum robotically coherent" with states that reach over the entire system.

Show description

Read Online or Download Electronic Transport. Part 1: Quantum Point Contacts and Quantum Wires PDF

Best nonfiction_12 books

Read e-book online The Sudoku Effect: Universities in the Vicious Circle of PDF

This ebook indicates that the advent of the eu credits move method (ECTS) of credits issues as a brand new accounting unit at universities has resulted in elevated paperwork and the schoolmaster-style regimentation of Bachelor’s and Master’s classes. It explains how, as a result of strain of getting to plot each operating hour of learning upfront, a ‘Sudoku impact’ is created by means of the need to mix classes, assessments and modules in this sort of means that the issues ‘add up’.

Download PDF by S. Albeverio, P. Kurasov: Singular perturbations of differential operators : solvable

Differential (and extra common self-adjoint) operators related to singular interactions come up evidently in a variety of issues comparable to, classical and quantum physics, chemistry, and electronics. This publication offers a scientific mathematical research of those operators, with specific emphasis on spectral and scattering difficulties.

Synthetic Polymer-Polymer Composites by Debes Bhattacharyya;Stoyko Fakirov PDF

This ebook presents one other strategy for the alternative of glass and different inorganic fibers as reinforcement for polymer composites. The fabrics applied contain man made, petroleum-based polymers yet ready right here they arrive within the type of fibers, micro- or nanofibrils. even though this strategy doesn't have the benefits of common fibers being biodegradable and hence environmentally innocuous.

Download PDF by Stefan Nimmrichter: Macroscopic Matter Wave Interferometry

Matter‐wave interferometry is a promising and profitable solution to discover actually macroscopic quantum phenomena and probe the validity of quantum idea on the borderline to the vintage global. certainly, we might quickly witness quantum superpositions with nano to micrometer-sized items. but, venturing deeper into the macroscopic area isn't just an experimental but in addition a theoretical endeavour: new interferometers needs to be conceived, assets of noise and decoherence pointed out, measurement results understood and attainable ameliorations of the idea taken into consideration.

Extra resources for Electronic Transport. Part 1: Quantum Point Contacts and Quantum Wires

Example text

44) nm Here tnm are the transmission amplitudes between tranverse modes m and n far from the constriction. The essence of the problem lies in the mode conversion which takes place at the entrance and exit of the QPC. Even in the absence of adiabatic transport, as discussed above, the states with lateral-quantization energy well below the Fermi energy couple well to the reservoirs and are almost perfectly transmitted (Tn = |tnn |2 ≈ 1). Indeed, for the simplified problem of a semiinfinite channel the transmission approaches unity very quickly as a function of the dimensionless parameter ∆ = kF w /π as shown in Fig.

7 Impurities Although the conductance quantization is a manifestation of ‘perfect’ transmission, a QPC is an inherently mesoscopic device and it is therfore to be expected that disorder will play a role in the determination of the individual device characteristics. The na¨ıve expectation that the Landolt-B¨ ornstein New Series III/34B(1) Ref. p. 72] Quantized transport 39 impurity configuration in the immediate vicinity of the QPC will produce a characteristic device ‘fingerprint’ has indeed been theoretically confirmed.

However, such fluctuations are not seen in the conductance of a QPC due to the filtering action of the channel modes [93M2]. Any fluctuations of the surrounding diffusive region are suppressed by a factor of 2(n/N ) where n is the number of channel modes and N the number of modes in the reservoir within an inelastic scattering length of the constriction. The lack of good quantization in channels whose length is considerably shorter than the elastic mean free path in high quality heterostructures has led to investigations of the role of the random impurity potential generated by the donors in the dopant layer [91N, 91L1].

Download PDF sample

Electronic Transport. Part 1: Quantum Point Contacts and Quantum Wires by (auth.), B. Kramer (eds.)

by Edward

Rated 4.15 of 5 – based on 46 votes