Speaker
Michael Pepper
Description
In this lecture a review of work performed with K.J. Thomas,
T.M. Chen, A.C.Graham,D.A. Ritchie, I. Farrer will be
presented on the role of momentum in determining the
transport properties of electrons in 1D nanostructures
formed from the GaAs-AlGaAs heterostructure. It will be
shown that by applying a source-drain voltage the energy
bands corresponding to the two directions of momentum can be
manipulated, (1). This technique gives considerable
understanding of the spin splitting in the channel which
seems to occur spontaneously, allowing measurements of such
properties as an interaction enhanced g value, (2-4).
When electrons move in one direction only they adopt a
ferromagnetic configuration, a variety of experiments will
be described which illustrate this effect, including the
coherence length of the spin polarisation, (5).
1. “Nonlinear transport in a single-mode one-dimensional electron gas.” Thomas K. J., Nicholls J. T., Simmons M. Y., Pepper M., Mace D. R., Ritchie D. A., Phil. Mag. B, 77,1213-1218. 1998.
2. “Direct observation of non-equilibrium spin populations in quasi-one-dimensional nanostructures” Chen T. -M., Graham A. C., Pepper M., Farrer I., Ritchie D. A., Anderson D. and Jones G. A. C., 2010, Nano Lett., 10, 2330–2334.
3. “Odd-even spin effects and variation of g factor in a quasi-one-dimensional subband”, Chen T-M., Graham A. C., Pepper M., Sfigakis F., Farrer I. and Ritchie D. A., 2009, Phys. Rev. B, 79, 081301 – 4
4. “Bias-controlled spin polarization in quantum wires” Chen T-M., Graham A. C., Pepper M., Farrer I. and Ritchie D. A., Appl. Phys. Lett., 93, 032101, 2008
5. “All-electrical injection and detection of a spin polarized current using a 1D conductor”, T.-M. Chen, M. Pepper, I. Farrer, G. A. C. Jones, D. A. Ritchie, arXiv:1202.5606, 2012
1. “Nonlinear transport in a single-mode one-dimensional electron gas.” Thomas K. J., Nicholls J. T., Simmons M. Y., Pepper M., Mace D. R., Ritchie D. A., Phil. Mag. B, 77,1213-1218. 1998.
2. “Direct observation of non-equilibrium spin populations in quasi-one-dimensional nanostructures” Chen T. -M., Graham A. C., Pepper M., Farrer I., Ritchie D. A., Anderson D. and Jones G. A. C., 2010, Nano Lett., 10, 2330–2334.
3. “Odd-even spin effects and variation of g factor in a quasi-one-dimensional subband”, Chen T-M., Graham A. C., Pepper M., Sfigakis F., Farrer I. and Ritchie D. A., 2009, Phys. Rev. B, 79, 081301 – 4
4. “Bias-controlled spin polarization in quantum wires” Chen T-M., Graham A. C., Pepper M., Farrer I. and Ritchie D. A., Appl. Phys. Lett., 93, 032101, 2008
5. “All-electrical injection and detection of a spin polarized current using a 1D conductor”, T.-M. Chen, M. Pepper, I. Farrer, G. A. C. Jones, D. A. Ritchie, arXiv:1202.5606, 2012
