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Ji H, Dhomkar S, Wu R, Ludwig J, Lu Z, Smirnov D, Tamargo MC, Bryant GW, Kuskovsky IL. Long spin-flip time and large Zeeman splitting of holes in type-II ZnTe/ZnSe submonolayer quantum dots. JOURNAL OF APPLIED PHYSICS 2018; 124:10.1063/1.5041478. [PMID: 31274882 PMCID: PMC6604638 DOI: 10.1063/1.5041478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Accepted: 09/22/2018] [Indexed: 06/09/2023]
Abstract
The Zeeman splitting and degree of circular polarization (DCP) of photoluminescence (PL) from type-II submonolayer ZnTe/ZnSe quantum dots (QDs) have been investigated in magnetic fields up to 18 T. To explain the observed relative intensities and energy positions of the σ+ and the σ- PL, a non-Boltzmann distribution for holes with ultra-long spin-flip time, confined to submonolayer QDs, is proposed. The g-factor of electrons, located in the ZnSe barriers, was obtained from fitting the temperature dependence of the DCP, and its value is in excellent agreement with that of bulk ZnSe. The g-factor of type-II excitons was extracted by analyzing the Zeeman splitting, from which the g-factor of holes confined within submonolayer ZnTe QDs was found to be ~2.65 ± 0.40. This value is considerably larger than that in bulk ZnTe. Tight-binding calculations using an sp 3 s* model were employed to understand the origin of such an increase. The results of the simulation match the experiment and show that the enhancement of the hole g-factor is mostly caused by a reduced orbital contribution to Zeeman splitting arising from the submonolayer thickness of these QDs.
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Affiliation(s)
- H. Ji
- Department of Physics, Queens College of CUNY, Queens, New York 11367, USA
- The Graduate Center of CUNY, New York, New York 10016, USA
| | - S. Dhomkar
- Department of Physics, Queens College of CUNY, Queens, New York 11367, USA
- The Graduate Center of CUNY, New York, New York 10016, USA
| | - R. Wu
- Department of Physics, Queens College of CUNY, Queens, New York 11367, USA
- The Graduate Center of CUNY, New York, New York 10016, USA
| | - J. Ludwig
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA
- Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
| | - Z. Lu
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA
- Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
| | - D. Smirnov
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA
| | - M. C. Tamargo
- The Graduate Center of CUNY, New York, New York 10016, USA
- Department of Chemistry, City College of CUNY, New York, New York 10031, USA
| | - G. W. Bryant
- Quantum Measurement Division and Joint Quantum Institute, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8423, USA
| | - I. L. Kuskovsky
- Department of Physics, Queens College of CUNY, Queens, New York 11367, USA
- The Graduate Center of CUNY, New York, New York 10016, USA
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Warnock J, Jonker BT, Petrou A, Chou WC, Liu X. Exciton energies in shallow quantum wells and spin superlattices. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:17321-17330. [PMID: 10008342 DOI: 10.1103/physrevb.48.17321] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Fu LP, Yu WY, Petrou A, Warnock J, Jonker BT. Competing spin exchange interactions in Zn1-xMnxSe/Zn1-yFeySe multiple-quantum-well structures. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:18272-18275. [PMID: 10008473 DOI: 10.1103/physrevb.48.18272] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Smyth JF, Tulchinsky DA, Awschalom DD, Samarth N, Luo H, Furdyna JK. Femtosecond scattering dynamics in magnetic semiconductor spin superlattices. PHYSICAL REVIEW LETTERS 1993; 71:601-604. [PMID: 10055317 DOI: 10.1103/physrevlett.71.601] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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