David A. Williams
Hitachi
168 Papers
721 Citations
David A. Williams is an academic researcher from Hitachi. The author has contributed to research in topics: Quantum dot & Coulomb blockade. The author has an hindex of 21, co-authored 168 publications. Previous affiliations of David A. Williams include University of Nottingham.
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Papers
Charge-qubit operation of an isolated double quantum dot.
TL;DR: This work has investigated coherent time evolution of pseudomolecular states of an isolated (leadless) silicon double quantum dot, where operations are carried out via capacitively coupled elements.
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Coulomb blockade anisotropic magnetoresistance effect in a (Ga,Mn)As single-electron transistor.
Joerg Wunderlich,Tomas Jungwirth,Bernd Kaestner,Andrew C. Irvine,Alexander B. Shick,N. W. B. Stone,Kaiyou Wang,U. Rana,A. D. Giddings,C. T. Foxon,R. P. Campion,David A. Williams,B. L. Gallagher +12 more
TL;DR: Effective kinetic-exchange model calculations in (Ga,Mn)As show chemical potential anisotropies consistent with experiment and ab initio calculations in transition metal systems suggest that this generic effect persists to high temperatures in metal ferromagnets with strong spin-orbit coupling.
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Large tunneling anisotropic magnetoresistance in (Ga,Mn)As nanoconstrictions.
A. D. Giddings,A. D. Giddings,M. N. Khalid,Tomas Jungwirth,Joerg Wunderlich,Shazia Yasin,R. P. Campion,K. W. Edmonds,Jairo Sinova,Kenchi Ito,Kaiyou Wang,David A. Williams,B. L. Gallagher,C. T. Foxon +13 more
TL;DR: In this paper, a large tunneling anisotropic magnetoresistance (TAMR) was observed in the same lateral geometry as AMR. The TAMR does not require noncollinear magnetization on either side of the constriction.
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Ultrafast Acoustic Phonon Ballistics in Semiconductor Heterostructures
TL;DR: In this paper, a longitudinal acoustic phonon pulse is generated at a preselected depth within a highly confined region through the coherent nonequilibrium deformation potential which was previously unobserved in such structures.
77
Huge tunnelling anisotropic magnetoresistance in (Ga,Mn)As nanoconstrictions
A. D. Giddings,Oleg Makarovsky,M. N. Khalid,Shazia Yasin,K. W. Edmonds,R. P. Campion,Jörg Wunderlich,Tomas Jungwirth,David A. Williams,B. L. Gallagher,C. T. Foxon +10 more
TL;DR: A large tunneling anisotropic magnetoresistance (TAMR) in (Ga,Mn)As lateral nanoconstrictions indicates that TAMR may be observable in other materials showing room temperature AMR and demonstrates that the physics of nanocontacts magnetoresistive devices can be much richer than previously thought.
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