Quantum Hall effect in 2 dimensional GaInAs structure


Autoria(s): Kuzmina, Kseniia
Data(s)

30/05/2013

30/05/2013

2013

Resumo

Transport properties of GaAs / δ – Mn / GaAs / InxGa1-xAs / GaAs structure with Mn δ – layer, which is separated from InxGa1-xAs quantum well (QW) by 3 nm thick GaAs spacer was investigated. This structure with high mobility was characterized by X-ray difractometry and reflectometry. Transport and electrical properties of the structure were measured by using Pulsed Magnetic Field System (PMFS). During investigation of the Shubnikov – de Haas and the Hall effects the main parameters of QW structure such as cyclotron mass, Fermi level, g – factor, Dingle temperature and concentration of holes were estimated. Obtained results show high quality of the prepared structure. However, anomalous Hall effect at temperatures 2.09 K, 3 K, 4.2 K is not clearly observed. Attempts to identify magnetic moment were made. For this purpose the polarity of the filed was changed to the opposite at each shot. As a result hysteresis loop was not observed in the magnetic field dependences of the anomalous Hall resistivity.This can be attributed to the imperfection of the experimental setup.

Identificador

http://www.doria.fi/handle/10024/90619

URN:NBN:fi-fe201305283757

Idioma(s)

en

Palavras-Chave #transport properties #2 dimensional structure #quantum well #magnetoresistance #the quantum Hall effect #the anomalous Hall effect #Shubnikov – de Haas oscillations
Tipo

Master's thesis

Diplomityö