Oxide interface based quantum wires
Event details
| Date | 25.04.2014 |
| Hour | 14:15 |
| Speaker | Prof. Yoram Dagan, School of Physics and Astronomy, Tel Aviv University, Israel |
| Location | |
| Category | Conferences - Seminars |
Oxide interfaces can have physical properties which are very different from their constituting materials. These properties can manifest themselves in various orders such as superconductivity, magnetism, and ferroelectricity. Of these interfaces probably the most studied one is the interface between the two insulating perovskites: SrTiO3 and LaAlO3, which exhibits properties of a two dimensional electron gas, superconductivity strong spin-orbit interaction and magnetism.
In this talk I will briefly review the state of the art research of oxide interfaces and especially SrTiO3/LaAlO3 interface. I will then describe our findings on nano-sized bridges (nanowires) and our new technique to fabricate quantum wires from such interfaces.
From transport in the nanowires we can probe an anomalous magnetic order consisting of domains with opposite magnetization having a higher coercive field for in-plane orientation. When making the wires even narrower a quantized conductance is observed with discrete steps as a function of gate voltage characteristics of a one dimensional channel. The step size of exactly half the quantum of conductance is an evidence for absence of spin degeneracy.
The possibility to control correlation effects, spin-orbit interactions and coupling to superconductivity makes this wire a laboratory for studying Majorana fermions and spin dependent transport.
Bio: Education
1997-2001
Tel Aviv University
Tel Aviv, Israel
Physics
Ph.D.
Jun 2002
Academic and professional experience
2009-Present
Tel Aviv University
School of Physics and Astronomy
Associate Professor
2005-2009
Tel Aviv University
School of Physics and Astronomy
Senior Lecturer
2002-2005
University of Maryland,
College Park, Maryland,
USA
Center for Superdonductivity Research
Research-Associate
(Post-doc)
In this talk I will briefly review the state of the art research of oxide interfaces and especially SrTiO3/LaAlO3 interface. I will then describe our findings on nano-sized bridges (nanowires) and our new technique to fabricate quantum wires from such interfaces.
From transport in the nanowires we can probe an anomalous magnetic order consisting of domains with opposite magnetization having a higher coercive field for in-plane orientation. When making the wires even narrower a quantized conductance is observed with discrete steps as a function of gate voltage characteristics of a one dimensional channel. The step size of exactly half the quantum of conductance is an evidence for absence of spin degeneracy.
The possibility to control correlation effects, spin-orbit interactions and coupling to superconductivity makes this wire a laboratory for studying Majorana fermions and spin dependent transport.
Bio: Education
1997-2001
Tel Aviv University
Tel Aviv, Israel
Physics
Ph.D.
Jun 2002
Academic and professional experience
2009-Present
Tel Aviv University
School of Physics and Astronomy
Associate Professor
2005-2009
Tel Aviv University
School of Physics and Astronomy
Senior Lecturer
2002-2005
University of Maryland,
College Park, Maryland,
USA
Center for Superdonductivity Research
Research-Associate
(Post-doc)
Practical information
- Informed public
- Free
Organizer
- ICMP (Arnaud Magrez and Raphael Butté)
Contact
- Prof D. Pavuna