arXiv subjects

D. Tang

Publications and source records attributed to D. Tang.

2 recordsLinked to original sources

arXiv2007

GaAs:Mn nanowires grown by molecular beam epitaxy of (Ga,Mn)As at MnAs segregation conditions

GaAs:Mn nanowires were obtained on GaAs(001) and GaAs(111)B substrates by molecular beam epitaxial growth of (Ga,Mn)As at conditions leading to MnAs phase separation. Their density is proportional to the density of catalyzing MnAs nanoislands, which can be controlled by the Mn flux and/or the substrate temperature. Being rooted in the ferromagnetic semiconductor (Ga,Mn)As, the nanowires combine one-dimensional properties with the magnetic properties of (Ga,Mn)As and provide natural, self assembled structures for nanospintronics.

cond-mat.mtrl-sci↗

arXiv1994

Conductance of an Artificial Atom in Strong Magnetic Fields

The conductance resulting from resonant tunneling through a droplet of $N \sim 30$ electrons is used to measure its chemical potential $μ_N$. Abrupt shifts of $μ_N$ occur at sharply defined values of the magnetic field, at which the state of the droplet changes. These are used to study part of the phase-diagram of the droplet in strong magnetic fields; we find evidence for a new phase in the spin polarized regime. We make a detailed comparison between theory and experiment: Hartree-Fock provides a quantitative description of the measurements when both spin-split states of the lowest orbital Landau level are occupied and a qualitative one in the spin polarized regime.

cond-mat↗