Single particle and collective localization around ν=1 integer quantum hall plateau in a high mobility two-dimensional electron system

In a two-dimensional electron system, different topologically protected bulk orders can occur depending upon the competition between electron-electron interaction and the disorder potential. In the middle of ν=1 plateau the bulk corresponds to single particle localization, Anderson Insulator, whereas the flanks correspond to a periodic arrangement. This type of localization corresponds to the appearance of Wigner crystal known as Integer Quantum Hall Wigner Solid (IQHWS). The phase boundaries of these states and other properties will be discussed as obtained from transport measurements in modern GaAs samples.