Heisenberg spin exchange in some enzymatically spin-labeled single-stranded nucleic acids

1986 ◽  
Vol 67 (1) ◽  
pp. 125-128 ◽  
Author(s):  
Shih-Chung Kao ◽  
Albert M Bobst
Keyword(s):  
Nucleic Acids ◽  
Spin Exchange ◽  
Heisenberg Spin ◽  
Heisenberg Spin Exchange

scholarly journals Valley interference and spin exchange at the atomic scale in silicon

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
B. Voisin ◽  
J. Bocquel ◽  
A. Tankasala ◽  
M. Usman ◽  
J. Salfi ◽  
...  
Keyword(s):  
Spin Exchange ◽  
Atomic Scale ◽  
Scanning Tunneling ◽  
Coulomb Interactions ◽  
Tunneling Microscopy ◽  
Quantum Process ◽  
Strongly Coupled ◽  
Heisenberg Spin ◽  
Heisenberg Spin Exchange ◽  
Complex Phenomena

AbstractTunneling is a fundamental quantum process with no classical equivalent, which can compete with Coulomb interactions to give rise to complex phenomena. Phosphorus dopants in silicon can be placed with atomic precision to address the different regimes arising from this competition. However, they exploit wavefunctions relying on crystal band symmetries, which tunneling interactions are inherently sensitive to. Here we directly image lattice-aperiodic valley interference between coupled atoms in silicon using scanning tunneling microscopy. Our atomistic analysis unveils the role of envelope anisotropy, valley interference and dopant placement on the Heisenberg spin exchange interaction. We find that the exchange can become immune to valley interference by engineering in-plane dopant placement along specific crystallographic directions. A vacuum-like behaviour is recovered, where the exchange is maximised to the overlap between the donor orbitals, and pair-to-pair variations limited to a factor of less than 10 considering the accuracy in dopant positioning. This robustness remains over a large range of distances, from the strongly Coulomb interacting regime relevant for high-fidelity quantum computation to strongly coupled donor arrays of interest for quantum simulation in silicon.

ESR Studies of Heisenberg Spin Exchange. II. Effects of Radical Charge and Size

1970 ◽  
Vol 52 (5) ◽  
pp. 2511-2522 ◽  
Author(s):  
Michael P. Eastman ◽  
Gerald V. Bruno ◽  
Jack H. Freed
Keyword(s):  
Spin Exchange ◽  
Heisenberg Spin ◽  
Heisenberg Spin Exchange

ESR Studies of Heisenberg Spin Exchange. III. An ELDOR Study

1970 ◽  
Vol 52 (1) ◽  
pp. 321-327 ◽  
Author(s):  
Michael P. Eastman ◽  
Gerald V. Bruno ◽  
Jack H. Freed
Keyword(s):  
Spin Exchange ◽  
Heisenberg Spin ◽  
Heisenberg Spin Exchange
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