The 0.5 plateau

Add to your list(s) Download to your calendar using vCal

• Dr. Rolf Crook (Semiconductor Physics Group, Cavendish Laboratory)
• Monday 16 October 2006, 14:15-15:15
• Mott Seminar Room, Cavendish Laboratory, Department of Physics.

If you have a question about this talk, please contact K DAS GUPTA.

Structure in 1D conductance below 2e²/h is of particular interest to researchers because new electron interaction effects may be dominant and because theory is incomplete. The 0.7 structure and the related 0.7 analog have been the focus of research. But there is another feature – the 0.5 plateau (at B=0). Although the 0.5 plateau has been reported several times in the past, it never received much attention perhaps because it is somewhat enigmatic. I’ll describe data from an induced GaAs quantum wire which exhibits a clear additional conductance plateau at 0.5*2e²/h in zero magnetic field. The plateau was most pronounced when the potential landscape was tuned to be symmetric using low-temperature scanning-probe techniques. Source-drain energy-spectroscopy and temperature response support the hypothesis that the origin of the plateau is the spontaneous spin-polarization of the transport electrons – a ferromagnetic phase. Such devices may have applications in the field of spintronics, to either generate or detect a spin polarized current without the complications associated with external magnetic fields or magnetic materials.

This talk is part of the Semiconductor Physics series.

This talk is included in these lists:

• All Cavendish Laboratory Seminars
• All Talks (aka the CURE list)
• Centre for Health Leadership and Enterprise
• Featured lists
• ME Seminar
• Mott Seminar Room, Cavendish Laboratory, Department of Physics
• Neurons, Fake News, DNA and your iPhone: The Mathematics of Information
• School of Physical Sciences
• Semiconductor Physics
• Thin Film Magnetic Talks

Note that ex-directory lists are not shown.