Transport in Random Quantum Dot Superlattices Typeset Using Revt E X 1
نویسندگان
چکیده
We present a novel model to calculate single-electron states in random quantum dot superlattices made of wide-gap semiconductors. The source of disorder comes from the random arrangement of the quantum dots (configu-rational disorder) as well as spatial inhomogeneities of their shape (morphological disorder). Both types of disorder break translational symmetry and prevent the formation of minibands, as occurs in regimented arrays of quantum dots. The model correctly describes channel mixing and broadening of allowed energy bands due to elastic scattering by disorder.
منابع مشابه
Crossover of Magnetoconductance Autocorrelation for a Ballistic Chaotic Quantum Dot Typeset Using Revt E X
The autocorrelation function C ';" (('; ") = hg('; ") g(' + '; " + ")i (' and " are rescaled magnetic ux and energy) for the magnetoconductance of a ballistic chaotic quantum dot is calculated in the framework of the su-persymmetric non-linear-model. The Hamiltonian of the quantum dot is modelled by a Gaussian random matrix. The particular form of the symmetry breaking matrix is found to be rel...
متن کاملSequential Tunneling in Doped Superlattices: Fingerprints of Impurity Bands Typeset Using Revt E X 1
Electrical transport through weakly-coupled doped superlattices is investigated theoretically. For all dopings we find negative differential conductivity at sufficiently high electric fields. In low-doped samples the presence of impurity bands modifies the current-voltage characteristics substantially and we find two different current peaks whose relative height is changing with the electron te...
متن کاملFrom Surface to Random Criticality in Layered Planar Ising Models. Typeset Using Revt E X
A general case of a spatially nonuniform planar layered Ising model, or an equivalent quantum Ising chain, is analysed with an exact functional real space renormalization group. Various surface, finite size, quasiperiodic and random layer (McCoy-Wu) universality classes are obtained and discussed within a single theoretical framework leading to new insights into the nature of random criticality...
متن کاملDesign of low power random number generators for quantum-dot cellular automata
Quantum-dot cellular automata (QCA) are a promising nanotechnology to implement digital circuits at the nanoscale. Devices based on QCA have the advantages of faster speed, lower power consumption, and greatly reduced sizes. In this paper, we are presented the circuits, which generate random numbers in QCA. Random numbers have many uses in science, art, statistics, cryptography, gaming, gambli...
متن کاملDesign of low power random number generators for quantum-dot cellular automata
Quantum-dot cellular automata (QCA) are a promising nanotechnology to implement digital circuits at the nanoscale. Devices based on QCA have the advantages of faster speed, lower power consumption, and greatly reduced sizes. In this paper, we are presented the circuits, which generate random numbers in QCA. Random numbers have many uses in science, art, statistics, cryptography, gaming, gambli...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2008