Mass enhancement and electron–hole coupling in InAs/GaSb bilayers studied by cyclotron resonance

✍ Scribed by C Petchsingh; R.J Nicholas; K Takashina; N.J Mason; J Zeman

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 178 KB
• Volume: 12
• Category: Article
• ISSN: 1386-9477
• DOI: 10.1016/s1386-9477(01)00272-7

✦ Synopsis

We report a study of cyclotron resonance (CR) in a bilayer-bipolar InAs=GaSb structure and the in uence of the spatial separation between the electrons and holes. At low magnetic ÿelds we ÿnd that the cyclotron mass of the electrons can double when the electrons and holes have a very small separation. At higher cyclotron energies we ÿnd that the CR lines are split by a series of resonances which are due to interband coupling, and which also increase rapidly in magnitude when the electron-hole separation is decreased. At very high ÿelds, in the quantum limit a new series of couplings is observed, with the resonances being split by energies in the range of 3-12 meV.