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Electronic structure of atomically coherent square semiconductor superlattices with dimensionality below two
- Source :
- Physical Review B, 88 (11), 2013, Physical Review B: Condensed Matter and Materials Physics (1998-2015), Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2013, 88, pp.115431-1-9. ⟨10.1103/PhysRevB.88.115431⟩, Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2013, 88, pp.115431-1-9. ⟨10.1103/PhysRevB.88.115431⟩
- Publication Year :
- 2013
- Publisher :
- American Physical Society (APS), 2013.
-
Abstract
- The electronic structure of recently synthesized square superlattices with atomic coherence composed of PbSe, CdSe, or CdTe nanocrystals (NCs) attached along {100} facets is investigated using tight-binding calculations. In experimental realizations of these systems [W. H. Evers et al., Nano Lett. 13, 2317 (2013)], NC facets are atomically bonded, resulting in single-crystalline sheets, which, due to their nanogeometry, have an effective dimensionality below two. We predict electronic structures composed of successive bands formed by strong coupling between the wave functions of nearest-neighbor NCs. This coupling is mainly determined by the number of atoms at the NC bonding plane. The band structures deviate markedly from that of the corresponding two-dimensional (2D) quantum well; the 2D case can be recovered, however, if the effects of the nanogeometry are gradually reduced. The width of the bands can reach hundreds of meV, ascribing highly promising transport properties to square superlattices. The band edges are located at k=0 except for PbSe superlattices, where their position in k space surprisingly depends on the parity of the number of {100} atomic planes in the NCs. Our calculations demonstrate that semiconductors with dimensionality below two have a strong potential for (opto-)electronic, photovoltaic, and spintronic applications.
- Subjects :
- Materials science
Spintronics
Condensed matter physics
business.industry
Superlattice
Physics [G04] [Physical, chemical, mathematical & earth Sciences]
02 engineering and technology
Electronic structure
021001 nanoscience & nanotechnology
Condensed Matter Physics
7. Clean energy
01 natural sciences
Electronic, Optical and Magnetic Materials
Atomic coherence
[SPI]Engineering Sciences [physics]
Semiconductor
Physique [G04] [Physique, chimie, mathématiques & sciences de la terre]
0103 physical sciences
Nano
010306 general physics
0210 nano-technology
business
Quantum well
Curse of dimensionality
Subjects
Details
- ISSN :
- 1550235X and 10980121
- Volume :
- 88
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi.dedup.....60f06330950ec12c2d4b51897b1c477f