Magnetic phase diagram and spin-Hall effect in the Rashba-Kondo model

Datum

10.07.2017

Zeit

11:00 - 12:00

Sprecher

Dr. Sanjeev Kumar

Zugehörigkeit

Indian Institute of Science Education (IISER) Mohali, India

Sprache

en

Hauptthema

Materialien

Andere Themen

Materialien, Physik

Host

Grit Rötzer

Beschreibung

Motivated by the search for materials and mechanisms that support large spin-Hall conductivity, we study a model of conductions electrons coupled to a lattice of localized magnetic moments. The itinerant electrons also experience a Rashba spin-orbit coupling -- leading to a Rashba-Kondo model. The model can be realized at the interface between a magnetic insulator and a metal, or even in the famous LAO-STO interfacial conduction layer (Nature Physics 9, 626(2013)). Recently, it was shown that the magnetic ordering can dramatically enhance the spin-Hall effect (Phys. Rev. B 95, 045146(2017)). However, a consistent calculation on the model requires construction of a magnetic phase diagram before attempting the study of the spin-Hall effect. We take up this task in the present study and construct variational phase diagram for the model. A variety of non-collinear and non-coplanar magnetic states are present as ground states of the model. We examine the spin-Hall conductivity in different magnetic phases, and as a function of Rashba spin-orbit coupling. Finally a general issue with spin-Hall conductivity calculations, which has to do with a proper definition of the spin current operator, is discussed.

Links

• Seminars at the IFW

Letztmalig verändert: 10.07.2017, 09:58:17