Novel 2D electron gases at the surface of transition-metal oxides
DIPC Seminars
- Speaker
-
Andrés F. Santander-Syro (CSNSM – Université Paris-Sud, France)
- When
-
2015/09/18
14:00 - Place
- Donostia International Physics Center
- Add to calendar
-
iCal
**Novel 2D electron gases at the surface of transition-metal oxides**
** **
Andrés F. Santander-Syro
CSNSM – Université Paris-Sud (France)
Transition-metal oxides (MOs) show remarkable properties, such as high-
temperature superconductivity or large magnetoresistance. The realization of
two-dimensional electron gases (2DEGs) at surfaces or interfaces of TMOs, a
field of current intense research, is crucial for harnessing the
functionalities of these materials for future applications. Additionally,
these 2DEGs offer the possibility to explore new physics emerging from the
combined effects of electron correlations and low-dimensional confinement.
Recently, we discovered that 2DEGs can be simply realized at the surface of
various insulating transparent TMOs, such as the quantum paraelectric SrTiO3
[1] or the strong spin-orbit coupled KTaO3 [2]. In this talk, I will show that
by choosing various surface terminations one can additionally tailor the
electronic structure and symmetries of these 2DEGs [3-4], paving the way for
the quest of topological states in correlated oxides. Furthermore, I will
discuss our latest observation of a giant spin splitting, of 100 meV, of bands
with opposite spin chiralities in the 2DEG at the surface of SrTiO3 [5]. These
results show that confined electronic states at oxide surfaces can be endowed
with novel properties, not present in the bulk, which are promising for
technological applications.
[1] A. F. Santander-Syro _et al_., Nature **469** , 189 (2011).
[2] A. F. Santander-Syro _et al_., Phys. Rev. B **86** , 121107(R) (2012).
[3] C. Bareille _et al_., Sci. Rep. **4** , 3586 (2014).
[4] T. C. Rödel _et al_., Phys. Rev. Applied **1** , 051002 (2014).
[5] A. F. Santander-Syro _et al_ , Nature Mater. **13** , 1085 (2014).