2004/01/19 by W. Desrat, F. Giazotto, Francesco Giazotto +9
Mathematics · Physics and Astronomy · #Condensed matter physics #Electron #Energy (signal processing) #Field (mathematics) #Landau quantization #Mathematics #Physics #Physics of Superconductivity and Magnetism #Quantum Hall effect #Quantum and electron transport phenomena #Quantum mechanics #Semiconductor Quantum Structures and Devices #Spin (aerodynamics) #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.69.245324
7 pages, 5 figures
arxiv created 2004/01/19 · openalex publication_date 2004/06/28 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report magnetotransport measurements on high-mobility two-dimensional electron systems (2DESs) confined in In0.75Ga0.25As∕In0.75Al0.25As single quantum wells. Several quantum Hall states are observed in a wide range of temperatures and electron densities, the latter controlled by a gate voltage down to values of 1\ifmmode×\else\texttimes\fi1011\phantom\rule0.3em0excm^\ensuremath-2. A tilted-field configuration is used to induce Landau level crossings and magnetic transitions between quantum Hall states with different spin polarizations. A large filling factor dependent effective electronic g-factor is determined by the coincidence method and cyclotron resonance measurements. From these measurements the change in exchange-correlation energy at the magnetic transition is deduced. These results demonstrate the impact of many-body effects in tilted-field magnetotransport of high-mobility 2DESs confined in In0.75Ga0.25As∕In0.75Al0.25As quantum wells. The large tunability of electron density and effective g-factor, in addition, make this material system a promising candidate for the observation of a large variety of spin-related phenomena.