TY - JOUR
T1 - Oscillatory tunnel splittings in spin systems
T2 - A discrete wentzel-kramers-brillouin approach
AU - Garg, Anupam
PY - 1999/1/1
Y1 - 1999/1/1
N2 - Certain spin Hamiltonians that give rise to tunnel splittings that are viewed in terms of interfering instanton trajectories are restudied using a discrete WKB method, that is more elementary, and also yields wave functions and preexponential factors for the splittings. A novel turning point inside the classically forbidden region is analyzed, and a general formula is obtained for the splittings. The result is applied to the \Fe8 system. A previous result for the oscillation of the ground state splitting with external magnetic field is extended to higher levels.
AB - Certain spin Hamiltonians that give rise to tunnel splittings that are viewed in terms of interfering instanton trajectories are restudied using a discrete WKB method, that is more elementary, and also yields wave functions and preexponential factors for the splittings. A novel turning point inside the classically forbidden region is analyzed, and a general formula is obtained for the splittings. The result is applied to the \Fe8 system. A previous result for the oscillation of the ground state splitting with external magnetic field is extended to higher levels.
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U2 - 10.1103/PhysRevLett.83.4385
DO - 10.1103/PhysRevLett.83.4385
M3 - Article
AN - SCOPUS:0001748438
SN - 0031-9007
VL - 83
SP - 4385
EP - 4388
JO - Physical review letters
JF - Physical review letters
IS - 21
ER -