Jamali, Shirin and Joshi, Gajadhar and Malissa, Hans and Lupton, John M. and Boehme, Christoph (2017) Monolithic OLED-Microwire Devices for Ultrastrong Magnetic Resonant Excitation. NANO LETTERS, 17 (8). pp. 4648-4653. ISSN 1530-6984, 1530-6992
Full text not available from this repository. (Request a copy)Abstract
Organic light-emitting diodes (OLEDs) make highly sensitive probes to test magnetic resonance phenomena under unconventional conditions since spin precession controls singlet-triplet transitions of electron-hole pairs, which in turn give rise to distinct recombination currents in conductivity. Electron paramagnetic resonance can therefore be detected in the absence of spin polarization. We exploit this characteristic to explore the exotic regime of ultrastrong light matter coupling, where the Rabi frequency of a charge carrier spin is of the order of the transition frequency of the two-level system. To reach this domain, we have to lower the Zeeman splitting of the spin states, defined by the static magnetic field B-0, and raise the strength of the oscillatory driving field of the resonance, B-1. This is achieved by shrinking the OLED and bringing the source of resonant radio frequency (RF) radiation as close as possible to the organic semiconductor in a monolithic device structure, which incorporates an OLED fabricated directly on top of an RF microwire within one monolithic thin-film device structure. With an RF driving power in the milliwatt range applied to the microwire, the regime of bleaching and inversion of the magnetic resonance signal is reached due to the onset of the spin-Dicke effect. In this example of ultrastrong light-matter coupling, the individual resonant spin transitions of electron-hole pairs become indistinguishable with respect to the driving field, and superradiance of the magnetic dipole transitions sets in.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | DOUBLE-QUANTUM DOT; COHERENT MANIPULATION; SPINS; SEMICONDUCTORS; Organic light-emitting diodes; conducting polymers; spin-dependent recombination; electron paramagnetic resonance; spin collectivity |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group John Lupton |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:16 |
| Last Modified: | 20 Feb 2019 07:49 |
| URI: | https://pred.uni-regensburg.de/id/eprint/1423 |
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