Dynamics of quantum entanglement in a zigzag graphene nanoribbon

We study the dynamics of entanglement between two edge spins in a zigzag graphene nanoribbon (ZGNR) which is thermalized with a reservoir at temperature T. The results show that the entanglement evolution displays oscillating behaviors in the presence of an external magnetic field. Such oscillating behaviors of entanglement strongly depend on the field frequency and relative location between two inter-edge coupled spins. At some critical field frequencies, the entanglement exhibits a periodic structure. When the temperature is low, the oscillating patterns of entanglement are quite regular and symmetrical. When the temperature is high, the patterns of entanglement evolution occur irregular distortions due to the thermal fluctuations. However, the entanglement between two inter-edge coupled spins in ZGNR still exists a nontrivial value even at room temperature.

Automated summary

In a zigzag graphene nanoribbon thermalized with a reservoir at temperature T, entanglement dynamics between two edge spins display oscillating behaviors in the presence of an external magnetic field. The oscillations strongly depend on the field frequency and relative location between spins. At critical field frequencies, the entanglement shows a periodic structure. Regular and symmetrical oscillating patterns occur at low temperatures, while irregular distortions appear at high temperatures due to thermal fluctuations. Even at room temperature, entanglement between two edge spins in ZGNR still maintains a nontrivial value.