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Density-Dependent Spin Polarization in Ultra-Low-Disorder Quantum Wires

2002; American Physical Society; Volume: 89; Issue: 24 Linguagem: Inglês

10.1103/physrevlett.89.246801

1092-0145

DJ Reilly, TM Buehler, Jeremy L. O’Brien, A. R. Hamilton, Andrew S. Dzurak, R. G. Clark, B. E. Kane, L. N. Pfeiffer, K. W. West,

Semiconductor materials and devices

There is controversy as to whether a one-dimensional (1D) electron gas can spin polarize in the absence of a magnetic field. Together with a simple model, we present conductance measurements on ultra-low-disorder quantum wires supportive of a spin polarization at B=0. A spin energy gap is indicated by the presence of a feature in the range (0.5-0.7)x2e(2)/h in conductance data. Importantly, it appears that the spin gap is not constant but a function of the electron density. Data obtained using a bias spectroscopy technique are consistent with the spin gap widening further as the Fermi level is increased.