Anisotropic Exchange Interaction between p-Shell Electron and s-Shell Hole in CdTe/ZnTe Quantum Dots

Shell structure and electron-electron interaction in self-assembled InAs quantum dots

Using far-infrared spectroscopy, we investigate the excitations of selforganized InAs quantum dots as a function of the electron number per dot, 1 ≤ ne ≤ 6, which is monitored in situ by capacitance spectroscopy. Whereas the well-known two-mode spectrum is observed when the lowest (s-) states are filled, we find a rich excitation spectrum for ne ≥ 3, which reflects the importance of electron-el...

FEW ELECTRON QUANTUM DOTS IN InAs/InP CORE SHELL NANOWIRES

Coulomb-interaction-induced incomplete shell filling in the hole system of InAs quantum dots.

We have studied the hole charging spectra of self-assembled InAs quantum dots in perpendicular magnetic fields by capacitance-voltage spectroscopy. From the magnetic-field dependence of the individual peaks we conclude that the s-like ground state is completely filled with two holes but that the fourfold degenerate p shell is only half filled with two holes before the filling of the d shell sta...

Long Electron-Hole Separation of ZnO-CdS Core-Shell Quantum Dots

Fen Xu,† Vyacheslav Volkov,‡ Yimei Zhu,‡ Hanying Bai,† Anthony Rea,§ Nikesh V. Valappil,§ Wei Su,† Xueyun Gao,† Igor L. Kuskovsky,*,§ and Hiroshi Matsui*,† Department of Chemistry and Biochemistry, The City UniVersity of New York Hunter College, 695 Park AVenue, New York, New York 10065, BrookhaVen National Laboratory (BNL), CMP Materials Science Department, Upton, New York 11973, and Departmen...

Shell effects on hole-coupled electron transfer dynamics from CdSe/CdS quantum dots to methyl viologen.

Electron transfer (ET) dynamics from the 1Se electron state in quasi-type II CdSe/CdS core/shell quantum dots (QDs) to adsorbed methyl viologen (MV(2+)) were measured using femtosecond transient absorption spectroscopy. The intrinsic ET rate kET was determined from the measured average number of ET-active MV(2+) per QD, which permits reliable comparisons of variant shell thickness and different...