TY - JOUR
T1 - Quantum diffusion in the strong tunneling regime
AU - Paul, Nisarga
AU - Amir, Ariel
N1 - Publisher Copyright: © 2019 American Physical Society.
PY - 2019/7
Y1 - 2019/7
N2 - We study the spread of a quantum-mechanical wave packet in a noisy environment, modeled using a tight-binding Hamiltonian. Despite the coherent dynamics, the fluctuating environment may give rise to diffusive behavior. When correlations between different level-crossing events can be neglected, we use the solution of the Landau-Zener problem to find how the diffusion constant depends on the noise. We also show that when an electric field or external disordered potential is applied to the system, the diffusion constant is suppressed with no drift term arising. The results are relevant to various quantum systems, including exciton diffusion in photosynthesis and electronic transport in solid-state physics.
AB - We study the spread of a quantum-mechanical wave packet in a noisy environment, modeled using a tight-binding Hamiltonian. Despite the coherent dynamics, the fluctuating environment may give rise to diffusive behavior. When correlations between different level-crossing events can be neglected, we use the solution of the Landau-Zener problem to find how the diffusion constant depends on the noise. We also show that when an electric field or external disordered potential is applied to the system, the diffusion constant is suppressed with no drift term arising. The results are relevant to various quantum systems, including exciton diffusion in photosynthesis and electronic transport in solid-state physics.
UR - http://www.scopus.com/inward/record.url?scp=85073650684&partnerID=8YFLogxK
U2 - https://doi.org/10.1103/PhysRevB.100.024110
DO - https://doi.org/10.1103/PhysRevB.100.024110
M3 - مقالة
SN - 2469-9950
VL - 100
SP - 1-
JO - Physical review. B
JF - Physical review. B
IS - 2
M1 - 024110
ER -