Wannier–Stark resonances in Zener tunneling diodes with GaAs/AlAs superlattices

✍ Scribed by K. Murayama; H. Nagasawa; S. Ozaki; M. Morifuji; C. Hamaguchi; A. Di Carlo; P. Vogl; G. Böhm; G. Weimann

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 78 KB
• Volume: 20
• Category: Article
• ISSN: 0749-6036
• DOI: 10.1006/spmi.1996.0106

✦ Synopsis

We present DC transport measurements of the valence to conduction band (Zener) tunneling current in a p-i-n diode with an ultrathin intrinsic layer containing a (GaAs) 5 /(AlAs) 2 multi-quantum well structure. According to recent theoretical predictions, the DC current should show maxima as a function of the reverse bias voltage that reflect the formation of Wannier-Stark resonances. So far, Wannier-Stark resonances have only been observed optically and never in a regime of strong Zener tunneling. Experimentally, we find the second derivative of the current-voltage characteristics to show a weak oscillatory structure indeed, indicating the existence of Wannier-Stark resonances in Zener tunneling.