Ferromagnetic spin coupling as the origin of 0.7 anomaly in quantum point contacts.

Abstract Submitted for the Mar09 Meeting of the American Physical Society

Submitted for the MAR09 Meeting of The American Physical Society Ferromagnetic spin coupling as the origin of 0.7 anomaly in quantum point contacts1 KARAN ARYANPOUR, JONG E. HAN, Department of Physics, SUNY at Buffalo — We study one-dimensional itinerant electron models with ferromagnetic coupling to investigate the origin of 0.7 anomaly in quantum point contacts (QPC). Linear conductance calcu...

Conductance Anomalies in Transport through Quantum Dots and Quantum Point contacts

Dienstag, 23. Mai 2017 17.15 Uhr Stuttgarter Physikalisches Kolloquium Max-Planck-Institut für Festkörperforschung Max-Planck-Institut für Intelligente Systeme Fachbereich Physik, Universität Stuttgart Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, 70569 Stuttgart-Büsnau Ansprechpartner: Christian Ast E-Mail: [email protected] Telefon: 0711 689-5250 Quantum dots and quantum poi...

The theory of the ”0.7 anomaly” in quantum point contacts

The phenomenology of the ”0.7 anomaly” in quantum point contacts is fully explained in terms of a quasi-localized state, which forms as the point contact opens up. Detailed numerical calculations within spin-density functional theory indeed confirm the emergence of such a state. Quantitative calculations of the conductance and the noise are obtained using a model based on these observations, an...

امواج اسپین و ناهمسانگردی تک جهتی در دولایه‌ایهای نازک فرومغناطیسپادفرومغناطیسی

  In this paper a simple model calculation of spin wave is given for the ferromagtic layer in ultra thin ferromagnetic/antiferromagnetic bilayer. In this model the magnetic layer is assumed as an isolated layer but the effect of antiferromagnetic layer on ferromagnetic layer and unidirectional anisotropy, is given in the effective field applied on each spin. The thin layer is assumed as two-dim...

Scanning gate imaging of quantum point contacts and the origin of the 0.7 anomaly