Document Type
Article
Original Publication Date
2008
Journal/Book/Conference Title
Physical Review B
Volume
78
Issue
19
DOI of Original Publication
10.1103/PhysRevB.78.193306
Date of Submission
April 2015
Abstract
We report a measurement of the ensemble-averaged transverse spin relaxation time (T∗2) in bulk and few molecules of the organic semiconductor tris-(8-hydroxyquinolinolato aluminum) or Alq3. This system exhibits two characteristic T∗2 times: the longer of which is temperature independent and the shorter is temperature dependent, indicating that the latter is most likely limited by spin-phonon interaction. Based on the measured data, we infer that the single-particle T2 time is probably long enough to meet Knill’s criterion for fault-tolerant quantum computing even at room temperature. Alq3 is also an optically active organic, and we propose a simple optical scheme for spin qubit readout. Moreover, we found that the temperature-dependent T∗2 time is considerably shorter in bulk Alq3powder than in few molecules confined in 1–2-nm-sized cavities. Because carriers in organic molecules are localized over individual molecules or atoms but the phonons are delocalized, we believe that this feature is caused by phonon bottleneck effect.
Rights
Kanchibotla, B., Pramanik, S., Bandyopadhyay, S., et al. Transverse spin relaxation time in organic molecules. Physical Review B, 78, 193306 (2008). Copyright © 2008 American Physical Society.
Is Part Of
VCU Electrical and Computer Engineering Publications
Comments
Originally published by the American Physical Society at: http://dx.doi.org/10.1103/PhysRevB.78.193306