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Energy gaps and interaction blockade in confined quantum systems
K Capelle1, M Borgh, K Kärkkäinen
1Departamento de Física e Informática, Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil.
Physical Review Letters
|August 7, 2007
Summary
Strongly confined particles exhibit unique properties, differing from atomic electrons. Single-particle eigenvalues accurately predict many-body energies and gaps in systems like quantum dots and trapped atoms.
Area of Science:
- Condensed Matter Physics
- Quantum Mechanics
- Atomic Physics
Background:
- Electrons in atoms and molecules show specific behaviors under confinement.
- Understanding many-body particle properties is crucial for quantum systems.
- Transport blockade phenomena are linked to the derivative discontinuity in functionals.
Purpose of the Study:
- To investigate universal properties of strongly confined particles.
- To explore the relationship between single-particle eigenvalues and many-body properties.
- To generalize the understanding of transport blockade phenomena.
Main Methods:
- Analysis of harmonically confined systems.
- Calculation of many-body particle addition and removal energies.
- Examination of energy gaps using single-particle eigenvalues.
Main Results:
- Strongly confined particles display properties distinct from atomic electrons.
- Single-particle eigenvalues accurately predict many-body energies and gaps in quantum dots and trapped atoms.
- Coulomb blockade is a specific instance of a general transport blockade phenomenon.
Conclusions:
- Universal properties of strongly confined particles are significantly different from those of electrons in atoms.
- The derivative discontinuity of the exchange-correlation functional broadly explains transport blockade phenomena.
- A novel van der Waals blockade is predicted in cold atom gases within traps.
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