Probing energy barriers and quantum confined states of buried semiconductor heterostructures with ballistic carrier injection: An experimental study

Probing energy barriers and quantum confined states of buried semiconductor heterostructures with ballistic carrier injection: An experimental study

A three-terminal spectroscopy that probes both subsurface energy barriers and interband optical transitions in a semiconductor heterostructure is demonstrated. A metal-base transistor with a unipolar p-type semiconductor collector embedding InAs/GaAs quantum dots QDs is studied. Using minorityor majority-carrier injection, ballistic electron emission spectroscopy and its related hot-carrier sca...

Probing a topological quantum critical point in semiconductor-superconductor heterostructures

Sumanta Tewari,1 J. D. Sau,2 V. W. Scarola,3 Chuanwei Zhang,4 and S. Das Sarma2 1Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, USA 2Condensed Matter Theory Center and Joint Quantum Institute, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA 3Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA 4Depar...

"Spin Injection and Scattering in Semiconductor Heterostructures"*

Efforts to implement semiconductor-based spintronic devices have been crippled by the lack of an efficient and practical means to electrically inject spin-polarized carriers into a semiconductor heterostructure. Spin injection from semimagnetic semiconductor contacts (ZnMnSe/AlGaAs/GaAs) has produced electron spin polarizations of ~ 85% in the GaAs QW [1]. Several factors potentially limit spin...

Carrier-carrier relaxation kinetics in quantum well semiconductor structures with nonparabolic energy bands

Energy states and exchange energy of coupled double quantum dot in a magnetic field

The ground state energies of two interacting electrons confined in a coupled double quantum dot (DQD) presented in a magnetic field has been calculated by solving the relative Hamiltonian using variational and exact diagonalization methods. The singlet-triplet transitions in the angular momentum and spin of the quantum dot ground state had been shown .We have studied the magnetic field versus c...