Nonadiabatic quantum fluctuations in the neutral ground state of tetrathiafulvalene- p -chloranil

2019 ◽  
Vol 100 (20) ◽  
Author(s):  
Yuko Watanabe ◽  
Hideo Ando ◽  
Akira Takahashi ◽  
Norikazu Tomita
Keyword(s):  
Ground State ◽  
Quantum Fluctuations ◽  
Neutral Ground

Loss of classicality in the alternating spin-½/spin-1 chain, in the presence of next-neighbor couplings and Dzyaloshinskii-Moriya interactions

2022 ◽  
Author(s):  
Abhiroop Lahiri ◽  
Swapan K Pati
Keyword(s):  
Ground State ◽  
Nearest Neighbor ◽  
Spiral Structure ◽  
Exchange Interactions ◽  
Quantum Fluctuations ◽  
Wave Theory ◽  
Range Order ◽  
Density Matrix Renormalization Group ◽  
Density Matrix Renormalization ◽  
Spin Spiral

Abstract We have considered and alternating spin-½/spin-1 chain with nearest-neighbor (J1), next-nearest neighbor (J2) antiferromagnetic Heisenberg interactions along with z-component of the Dzyaloshinskii-Moriya(DM) (Dz) interaction. The Hamiltonian has been studied using (a) Linear Spin-Wave Theory(LSWT) and (b) Density Matrix Renormalization Group (DMRG). The system had been reported earlier as a classical ferrimagnet only when nearest neighbor exchange interactions are present. Both the antiferromagnetic next-nearest neighbor interactions and DM interactions introduce strong quantum fluctuations and due to which all the signatures of ferrimagnetism vanishes. We find that the nonzero J2 introduces strong quantum fluctuations in each of the spin sites due to which the z-components of both spin-1 and spin-1/2 sites average out to be zero. The ground state becomes a singlet. The presence of J1 along with Dzintroduces a short range order but develops long range order along the XY plane. J1 along with J2induces competing phases with structure factor showing sharp and wide peaks, at two different angles reflecting the spin spiral structure locally as well as in the underlying lattice. Interestingly, we find that the Dz term removes the local spin spiral structure in z-direction, while developing a spiral order in the XY plane.

Influence of quantum fluctuations on the ground state of quasi-one-dimensional triangular antiferromagnet

2000 ◽  
Vol 284-288 ◽  
pp. 1623-1624
Author(s):  
B.S. Dumesh ◽  
V.A. Panfilov ◽  
A.M. Tikhonov ◽  
D.N. Fourzikov
Keyword(s):  
Ground State ◽  
Quantum Fluctuations ◽  
One Dimensional

Antiparallel-Aligned Neutral-Ground-State and Zwitterionic Chromophores as a Nonlinear Optical Material

2006 ◽  
Vol 128 (21) ◽  
pp. 6847-6853 ◽  
Author(s):  
Yi Liao ◽  
Sanchali Bhattacharjee ◽  
Kimberly A. Firestone ◽  
Bruce E. Eichinger ◽  
Rajan Paranji ◽  
...  
Keyword(s):  
Ground State ◽  
Nonlinear Optical ◽  
Optical Material ◽  
Nonlinear Optical Material ◽  
Neutral Ground

scholarly journals QUANTUM FLUCTUATIONS OF THE ANGULAR MOMENTUM AND ENERGY OF THE GROUND STATE

1998 ◽  
Vol 13 (01) ◽  
pp. 33-37 ◽  
Author(s):  
M. N. SERGEENKO
Keyword(s):  
Angular Momentum ◽  
Ground State ◽  
Three Dimensional ◽  
Quantum Fluctuations ◽  
Schrödinger’S Equation ◽  
Schrödinger's Equation

Quasiclassical solution of the three-dimensional Schrödinger's equation is given. It is shown apparently that the exitence of nonzero minimal angular momentum M0=ℏ/2 corresponds to the quantum fluctuations of the angular momentum and contributes to the energy of the ground state.

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