Back to Search
Start Over
Single-electron capacitance spectroscopy of a few electron box
- Source :
- Physica B: Condensed Matter. 189:117-124
- Publication Year :
- 1993
- Publisher :
- Elsevier BV, 1993.
-
Abstract
- This paper presents a technique which permits a quantitative spectroscopy of discrete quantum levels in structures containing as few as one electron. The ground state energy in a quantum dot can be measured for an arbitrary number of electrons and followed as a function of magnetic field. The method involves monitoring the capacitance signal resulting from the tunneling of single electrons. In a microscopic capacitor fabricated in GaAs we study the confined states of a single 1 μm disk to which electrons can tunnel from a nearby metallic layer. Charge transfer occurs only for bias voltages at which a quantum level is resonant with the Fermi energy of the metallic layer. This creates a sequence of distinct capacitance peaks whose bias positions can ve directly converted to an energy scale to determine the electronic spectrum of the confined structure. The evolution of the spectrum in magnetic field allows deduction of the nature of the bound states.
- Subjects :
- Materials science
Condensed matter physics
Fermi energy
Electron
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
Condensed Matter Physics
Molecular physics
Capacitance
Electronic, Optical and Magnetic Materials
Quantum dot
Bound state
Electrical and Electronic Engineering
Ground state
Spectroscopy
Quantum tunnelling
Subjects
Details
- ISSN :
- 09214526
- Volume :
- 189
- Database :
- OpenAIRE
- Journal :
- Physica B: Condensed Matter
- Accession number :
- edsair.doi...........d1c5bb3ae296c5addd62694339676bb2