טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
Ph.D Thesis
Ph.D StudentBolker Asaf
SubjectMeasurement of Quantization Effects in Low Dimensional
Diamond Systems
DepartmentDepartment of Physics
Supervisors Professor Emeritus Rafael Kalish
Dr. Cecile Saguy
Full Thesis textFull thesis text - English Version


Abstract

Diamond has regained interest in recent years due to the unique optical properties of its color centers (such as the negatively charged nitrogen-vacancy center [NV-]), the ability to control its conductivity by applying various terminations to its surface and the fact that it is a non-cytotoxic and biocompatible material. In addition diamond can be produced in the form of nano particles, paving the way to a variety of exciting applications ranging from easily positioned single photon sources to cell biomarkers and nanometric drug delivery platforms. However, the use of these low dimensional diamond systems and the development of new applications based on the quantum properties of diamond require a better understanding of their electronic properties.

In this work the electronic properties of low dimensional diamond systems are probed using scanning tunneling microscopy (STM) and spectroscopy (STS), which enable the measurement of the local density of state (LDOS) at sub-nanometer spatial resolution.

The work examines in detail low dimensional diamond systems ranging from  2D confined hole layer created by hydrogen termination and humidity exposure of the diamond surface (electrochemical transfer doping model) to the 0D confinement and Coulomb blockade in single isolated nanodiamonds.

The results of this work include the first direct measurement of the electronic structure of the quantum well that is formed on the transfer doped diamond surface, and the first experimental evidence of quantum confinement effects in single isolated nano-diamonds that start at 4.5nm crystallites.