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Long spin-flip time and large Zeeman splitting of holes in type-II ZnTe/ZnSe submonolayer quantum dots

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.5041478· OSTI ID:1610735
 [1];  [2];  [2];  [3];  [3];  [4];  [5];  [6];  [2]
  1. Queens College of City Univ. of New York (CUNY), Flushing, NY (United States); City Univ. of New York (CUNY), NY (United States). Graduate Center; DOE/OSTI
  2. Queens College of City Univ. of New York (CUNY), Flushing, NY (United States); City Univ. of New York (CUNY), NY (United States). Graduate Center
  3. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab), and Dept. of Physics
  4. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
  5. City Univ. of New York (CUNY), NY (United States). Graduate Center; National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  6. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Quantum Measurement Division and Joint Quantum Inst.
+ Show Author Affiliations

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 sp3s* 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.

Research Organization:
City Univ. of New York (CUNY), NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF)
Grant/Contract Number:
SC0003739
OSTI ID:
1610735
Alternate ID(s):
OSTI ID: 1606059
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 14 Vol. 124; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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