No abstract

Spin state switching of the DNA sequences due to external stimuli is investigated theoretically. A molecular-based memory or logic device such as a spin switch could be directly realized within an electronic circuit. The DNA system is subjected an electrical potential difference through the metal leads for controling the spin transport. The spectral analysis of spin states demonstrates that voltage operates as a crucial tool to turns the switch on. The width of functional voltage range changes when the system is subjected to an external magnetic field. The magnetic field reduces the system symmetry and drives the system to the extended state. Hence, the voltage and magnetic field can modulate the spin transport properties of DNA. The ability to control the spin localization/delocalization states in DNA chains opens up a new approach for efficient computation and data storage.

Investigating the dynamical behavior of a system is an effective method to predict and control its future behavior. Studying the dynamic behavior of a virus can prevent the pathogenicity of a virus and save human lives during the disease epidemic. If the transmission of information from the virus genome to the environment is locked, the pathogenicity of the virus stops. Information transmission can be checked via the investigation of the spin information transport. In the current study, we have characterized the dynamical behavior of the virus by studying the spin transport through its RNA chain to estimate the information transfer path in the system. A voltage generator with adjustable frequency as a control system has been designed using the control theory of chaotic systems. Our aim is disturbing and reduces the transmitted information from viruses to the environment. The external stimuli can propel the system to the locked information transfer situation. Applying an external field noise with a specific frequency range ($200-500~GHz$) controlled through the external controller system can destroy the information transmitted by the virus to the environment. Disturbance intensity as a control parameter adjusts the external field frequency to push the system to the chaotic behavior which will be able to lock the information transfer and then prevent the spread of the epidemic.