Zobrazeno 1 - 10
of 732
pro vyhledávání: '"Kopp, T."'
Publikováno v:
J. Phys.: Condens. Matter 31, 295601 (2019)
We investigate the effect of oxygen vacancies and hydrogen dopants at the surface and inside slabs of LaAlO3, SrTiO3, and LaAlO3/SrTiO3 heterostructures on the electronic properties by means of electronic structure calculations as based on density fu
Externí odkaz:
http://arxiv.org/abs/1803.01382
Publikováno v:
J. Phys.: Condens. Matter 29, 095501 (2017)
The role of electronic correlation effects for a realistic description of the electronic properties of LaAlO3/SrTiO3 heterostructures as covered by the on-site Coulomb repulsion within the GGA+U approach is investigated. Performing a systematic varia
Externí odkaz:
http://arxiv.org/abs/1607.03945
Autor:
Zabaleta, J., Borisov, V. S., Wanke, R., Jeschke, H. O., Parks, S. C., Baum, B., Teker, A., Harada, T., Syassen, K., Kopp, T., Pavlenko, N., Valentí, R., Mannhart, J.
Two-dimensional electron systems with fascinating properties exist in multilayers of standard semiconductors, on helium surfaces, and in oxides. Compared to the two-dimensional (2D) electron gases of semiconductors, the 2D electron systems in oxides
Externí odkaz:
http://arxiv.org/abs/1605.08528
Autor:
Piyanzina, I. I., Lysogorskiy, Yu. V., Varlamova, I. I., Kiiamov, A. G., Kopp, T., Eyert, V., Nedopekin, O. V., Tayurskii, D. A.
Publikováno v:
J. Low Temp. Phys. 185, 597-602 (2016)
Recently, it was established that a two-dimensional electron system can arise at the interface between two oxide insulators LaAlO3 and SrTiO3. This paradigmatic example exhibits metallic behaviour and magnetic properties between non-magnetic and insu
Externí odkaz:
http://arxiv.org/abs/1601.04009
Publikováno v:
Phys. Rev. B 88, 201104(R) (2013)
The emergence of magnetism in otherwise nonmagnetic compounds and its underlying mechanisms have become the subject of intense research. Here we demonstrate that the nonmagnetic oxygen vacancies are responsible for an unconventional magnetic state co
Externí odkaz:
http://arxiv.org/abs/1308.5319
Autor:
Berner, G., Sing, M., Fujiwara, H., Yasui, A., Saitoh, Y., Yamasaki, A., Nishitani, Y., Sekiyama, A., Pavlenko, N., Kopp, T., Richter, C., Mannhart, J., Suga, S., Claessen, R.
Publikováno v:
Phys. Rev. Lett. 110, 247601 (2013)
The interface between LaAlO3 and SrTiO3 hosts a two-dimensional electron system of itinerant carriers, although both oxides are band insulators. Interface ferromagnetism coexisting with superconductivity has been found and attributed to local moments
Externí odkaz:
http://arxiv.org/abs/1301.2824
Publikováno v:
Phys. Rev. B 86, 064431 (2012)
We show that oxygen vacancies at titanate interfaces induce a complex multiorbital reconstruction which involves a lowering of the local symmetry and an inversion of t2g and eg orbitals resulting in the occupation of the eg orbitals of Ti atoms neigh
Externí odkaz:
http://arxiv.org/abs/1204.4711
Publikováno v:
Phys. Rev. B 84, 100510(R) (2011)
We discuss a scenario for interface-induced superconductivity involving pairing by dipolar excitations proximate to a two-dimensional electron system controlled by a transverse electric field. If the interface consists of transition metal oxide mater
Externí odkaz:
http://arxiv.org/abs/1108.1942
Publikováno v:
Phys. Rev. Lett. 108, 117002 (2012)
Strong correlations are known to severely reduce the mobility of charge carriers near half-filling and thus have an important influence on the current carrying properties of grain boundaries in the high-$T_c$ cuprates. In this work we present an exte
Externí odkaz:
http://arxiv.org/abs/1106.5759
Publikováno v:
Phys. Rev. B 85, 020407(R) (2012)
Ferromagnetism and superconductivity are in most cases adverse. However, recent experiments reveal that they coexist at interfaces of LaAlO3 and SrTiO3. We analyze the magnetic state within density functional theory and provide evidence that magnetis
Externí odkaz:
http://arxiv.org/abs/1105.1163