Shreekantha Sil, Santanu K. Maiti, Arunava Chakrabarti
Electronic transport in closed loop structures is addressed within a
tight-binding formalism and in the presence of both the Rashba and Dresselhaus
spin-orbit interactions. It has been shown that any one of the spin-orbit
fields can be estimated precisely if the other one is known, by observing
either the transmission resonance or anti-resonance of unpolarized electrons.
The result is obtained through an exact analytic calculation for a simple
square loop, and through a numerically exact formulation for a circular ring.
The magnetic field controls the transmission spectrum in a non-trivial way, and
coupled with the loop geometry it opens up the possibility of measuring the
strength of a spin-orbit interaction. The zero field transmission spectrum
obtained from a simple square loop is found to be in sharp contrast to that
obtained from a ring structure. The sensitivity of the spin transport on the
geometry of the interferometer is discussed in details with simple examples.
View original:
http://arxiv.org/abs/1201.4633
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