Hole Band Mixing in CdS and CdSe Quantum Dots and Quantum Rods
Using a six-band k·p Hamiltonian for wurtzite lattice, we study the hole ground state symmetry and composition in spherical quantum dots and elongated quantum rods made of CdS and CdSe. The ground state crossovers which occur when changing the nanocrystal size and shape are well understood in terms...
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| Published in: | Journal of physical chemistry. C Vol. 114; no. 18; pp. 8337 - 8342 |
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| Main Authors: | , , |
| Format: | Journal Article |
| Language: | English |
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American Chemical Society
13-05-2010
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| Abstract | Using a six-band k·p Hamiltonian for wurtzite lattice, we study the hole ground state symmetry and composition in spherical quantum dots and elongated quantum rods made of CdS and CdSe. The ground state crossovers which occur when changing the nanocrystal size and shape are well understood in terms of hole band mixing. Contrary to previous belief, the quantum rod ground state crossover with increasing length is shown not to occur at a fixed aspect ratio. The geometry and composition that maximize the spin purity and the intensity of linearly polarized light emission are elucidated. The six-band wurtzite Hamiltonian results for CdSe are compared to those obtained with quasi-cubic four-band and one-band Hamiltonians, and the performance of these simplified Hamiltonians is discussed. |
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| AbstractList | Using a six-band k·p Hamiltonian for wurtzite lattice, we study the hole ground state symmetry and composition in spherical quantum dots and elongated quantum rods made of CdS and CdSe. The ground state crossovers which occur when changing the nanocrystal size and shape are well understood in terms of hole band mixing. Contrary to previous belief, the quantum rod ground state crossover with increasing length is shown not to occur at a fixed aspect ratio. The geometry and composition that maximize the spin purity and the intensity of linearly polarized light emission are elucidated. The six-band wurtzite Hamiltonian results for CdSe are compared to those obtained with quasi-cubic four-band and one-band Hamiltonians, and the performance of these simplified Hamiltonians is discussed. |
| Author | Climente, J. I Planelles, J Rajadell, F |
| Author_xml | – sequence: 1 givenname: J surname: Planelles fullname: Planelles, J – sequence: 2 givenname: F surname: Rajadell fullname: Rajadell, F – sequence: 3 givenname: J. I surname: Climente fullname: Climente, J. I email: josep.planelles@qfa.uji.es |
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| CitedBy_id | crossref_primary_10_1021_acs_chemrev_3c00742 crossref_primary_10_1021_acs_jpcc_6b11240 crossref_primary_10_1088_0953_8984_24_11_115801 crossref_primary_10_1063_5_0032172 crossref_primary_10_1002_adom_202201378 crossref_primary_10_1088_1367_2630_15_9_093009 crossref_primary_10_1039_c3nr03252c crossref_primary_10_1039_C6RA22433D crossref_primary_10_1126_science_1198070 crossref_primary_10_1021_jp407453e crossref_primary_10_1021_acs_chemrev_2c00676 |
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| Title | Hole Band Mixing in CdS and CdSe Quantum Dots and Quantum Rods |
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