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Boson-Induced Orbital Kondo Effect

100%

Lipiński S.

Acta Physica Polonica A

2008

vol. 113

issue 1

549-552

The single dot in magnetic field and double quantum dot with broken spin-orbital symmetry are discussed in the boson field environment. It is shown that the time dependent potential induces the Kondo effect, provided that the single boson energy compensates the spin or orbital splitting. The photon induced recovery of orbital degeneracy can occur within the same spin channel or with the spin mixing. In the former case the spin polarized photocurrent is expected.

Electroluminescence Investigation of the Lateral Field Distribution in AlGaN/GaN HEMTs for Power Applications

63%

Baeumler M., Polyakov V., Gütle F., Dammann M., Benkhelifa F., Waltereit P., Reiner R., Müller S., Wespel M., Quay R., Mikulla M., Wagner J., Ambacher O.

Acta Physica Polonica A

2014

vol. 125

issue 4

982-985

The lifetime and stability of AlGaN/GaN heterostructure field effect transistors at high power levels can be enhanced by introducing field plates to reduce electric field peaks in the gate-drain region. Simulations of the electric field distribution along the channel using the 2D ATLAS software from Silvaco indicate that above a characteristic drain source voltage three spatially separated electric field peaks appear, one located at the drain-side edge of the gate foot, one at the end of the drain-sided gate field plate, and one at the end of the source shield field plate. The close correlation between lateral electric field and the electroluminescence due to hot electron related intra-band transitions can be very helpful when optimizing the electric field distribution in high power devices. Electroluminescence microscopy images of devices with gate and source shield field plate reveal the peaks located at the locations of enhanced electric field. By studying the voltage dependence of the electroluminescence peaks the influence of the field plates on the electric field distribution in source drain direction can be visualized.

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2 Acta Physica Polonica A

1 2014

1 2008

1 Ambacher O.

1 Baeumler M.

1 Benkhelifa F.

1 Dammann M.

1 Gütle F.

1 Lipiński S.

1 Mikulla M.

1 Müller S.

1 Polyakov V.

1 Quay R.

1 Reiner R.

1 Wagner J.

1 Waltereit P.

1 Wespel M.

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Boson-Induced Orbital Kondo Effect

Electroluminescence Investigation of the Lateral Field Distribution in AlGaN/GaN HEMTs for Power Applications