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Phys. Rev. Lett. 74, 450 - 453 (1995)

Evidence for a Stable Excitonic Ground State in a Spatially Separated Electron-Hole System

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J. -P. Cheng
Francis Bitter National Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

J. Kono and B. D. McCombe
Department of Physics, State University of New York at Buffalo, Buffalo, New York 14260

I. Lo, W. C. Mitchel, and C. E. Stutz
WL/MLPO and WL/ELRA, Wright Laboratory, Wright-Patterson Air Force Base, Ohio 45433-6533

Received 3 March 1994

Far-infrared magnetospectroscopy on InAs/AlxGa1-xSb quantum-well structures has revealed new transitions (X lines) when sufficient holes (in AlxGa1-xSb) coexist with electrons (in InAs) and the magnetic field is high enough. The electron-related X line is about 3 meV above electron cyclotron resonance, has roughly the same slope vs magnetic field, and increases in intensity with increasing hole density or decreasing temperature. This line is assigned to an internal excitonic transition and provides evidence for the existence of an excitonic ground state.


©1995 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.74.450
DOI: 10.1103/PhysRevLett.74.450
PACS: 73.20.Dx, 71.35.+z, 78.66.Fd

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