Ballistic thermopower of suspended semiconductor Hall bars with two dimensional electron gas

2nd International School and Conference Saint-Petersburg OPEN on Optoelectronics, Photonics, Engineering and Nanostructures

Zhdanov, E.Yu.^1,2 ; Pogosov, A.G.^1,2 ; Budantsev, M.V.^1 ; Pokhabov, D.A.^1,2 ; Bakarov, A.K.^1 ; Toropov, A.I.^1

Institute of Semiconductor Physics, SB RAS, Novosibirsk, Russia^1

Novosibirsk State University, Novosibirsk, Russia^2

关键词: Ballistic electron transport;    Ballistic regime;    Heat transport;    Nonlinear effect;    Semiconductor nanostructures;    Square lattices;    Suspended structure;    Thermopower measurements;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/643/1/012079/pdf
DOI  :  10.1088/1742-6596/643/1/012079

来源: IOP

【 摘 要 】

We study ballistic electron transport in suspended semiconductor nanostructures containing high mobility two dimensional electron gas structured with periodical square lattice of artificial scatters - antidots. Thermopower demonstrates magnetic field commensurability oscillations resulting from geometrical resonances similar to those earlier observed in magnetoresistance, thus indicating the retaining of the ballistic regime in thermopower measurement on suspended structures and the validity of the Mott rule in this case. In spite of peculiarities of the heat transport in suspended structures leading to the observed anomalies in non-linear effects, the amplitude of thermopower oscillations remains unchanged after the suspension. This can be explained by short Thouless time compared to the time of electron- phonon interaction.