Strain Induced Vertical and Lateral Correlations in Quantum Dot Superlattices
نویسندگان
چکیده
منابع مشابه
Strain distribution in GaN/AlN quantum-dot superlattices
The two-dimensional strain distribution in a GaN/AlN quantum-dot QD superlattice is measured from high-resolution transmission electron microscopy images using the geometrical phase analysis. The results are compared to elastic theoretical calculations using a combination of Fourier transform and Green’s function techniques. The GaN/AlN system appears to be a model system for a comparison betwe...
متن کاملStrain-induced quantum ring hole states in a gated vertical quantum dot.
We have experimentally investigated the hole states in a gated vertical strained Si/SiGe quantum dot. We demonstrate the inhomogeneous-strain relaxation on the lateral surface creates a ringlike potential near the perimeter of the dot, which can confine hole states exhibiting quantum ring characteristics. The magnetotunneling spectroscopy exhibits the predicted periodicity of energy states in p...
متن کاملSuperconductivity in quantum-dot superlattices composed of quantum wire networks
Based on calculations using the local density approximation, we propose quantum wire networks with square and plaquette type lattice structures that form quantum dot superlattices. These artificial structures are well described by the Hubbard model. Numerical analysis reveals a superconducting ground state with transition temperatures Tc of up to 90 mK for the plaquette, which is more than doub...
متن کاملOptical phonons in self-assembled Ge quantum dot superlattices: Strain relaxation effects
We present Raman scattering by optical phonons in self-assembled Ge quantum dot superlattices grown by solid-source molecular beam epitaxy. The Ge quantum dots are vertically correlated and have different average sizes and dot morphologies. The GeGe optical phonon frequency was mainly caused by strain relaxation effects. Experimentally observed GeGe optical phonon modes were compared with calcu...
متن کاملBinary quantum-dot superlattices: the beauty and the science
In nanoscience, two main ambitions are the control of the structure of an extended system up to the last atom, and to establish the relationship between the assembled structure and its properties. In the field of colloidal nanocrystals, these ambitions emerge on two scales: (i) the atomic scale, in controlling the crystal structure and understanding the ensuing properties (ii) the nanocrystal s...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review Letters
سال: 1999
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.83.356