TY - GEN
T1 - A wide GaAs/GaAlAs quantum well simultaneously containing two dimensional electrons and holes
AU - Jensen, Ane
AU - Utko, Magdalena
AU - Lindelof, Poul Erik
AU - Takashina, Kei
AU - Hirayama, Yoshiro
PY - 2008
Y1 - 2008
N2 - We report on a novel 200 nm wide GaAs/GaAlAs quantum well, which can contain either electrons or holes. The structure has a p-doped layer above the quantum well, and a superlattice (AlAs/GaAs) barrier below shielding the quantum well from the highly n-doped 311A GaAs substrate, which acts as a back-gate. p-Hall bars are fabricated with ohmic Au/Zn p-contacts, and n-Hall bars are fabricated by etching away the p-doped top layer and applying ohmic Au/Ge/Ni contacts. There is an overlapping region of the back-gate voltage where a two dimensional electron gas is induced in the n-Hall bars and a two dimensional hole gas still exists in the p-Hall bars. This unique system allows for devices, where coupling between high quality electron and hole gases is controlled by the back-gate.
AB - We report on a novel 200 nm wide GaAs/GaAlAs quantum well, which can contain either electrons or holes. The structure has a p-doped layer above the quantum well, and a superlattice (AlAs/GaAs) barrier below shielding the quantum well from the highly n-doped 311A GaAs substrate, which acts as a back-gate. p-Hall bars are fabricated with ohmic Au/Zn p-contacts, and n-Hall bars are fabricated by etching away the p-doped top layer and applying ohmic Au/Ge/Ni contacts. There is an overlapping region of the back-gate voltage where a two dimensional electron gas is induced in the n-Hall bars and a two dimensional hole gas still exists in the p-Hall bars. This unique system allows for devices, where coupling between high quality electron and hole gases is controlled by the back-gate.
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U2 - 10.1142/9789812814623_0044
DO - 10.1142/9789812814623_0044
M3 - Conference contribution
AN - SCOPUS:84903893747
SN - 9812814612
SN - 9789812814616
T3 - MS+S 2006 - Controllable Quantum States: Mesoscopic Superconductivity and Spintronics, Proceedings of the International Symposium
SP - 277
EP - 281
BT - MS+S 2006 - Controllable Quantum States
PB - World Scientific Publishing Co. Pte Ltd
T2 - 4th International Symposium on Mesoscopic Superconductivity and Spintronics, MS+S 2006
Y2 - 27 February 2006 through 2 March 2006
ER -