Stability of polarized states for diamond valleytronics

The stability of valley polarized electron states is crucial for the development of valleytronics. A long relaxation time of the valley polarization is required to enable operations to be performed on the polarized states. Here, we investigate the stability of valley polarized states in diamond, exp...

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Bibliographic Details
Published in:Applied physics letters 2014-06, Vol.104 (23), p.232105
Main Authors: Hammersberg, J., Majdi, S., Kovi, K. K., Suntornwipat, N., Gabrysch, M., Twitchen, D. J., Isberg, J.
Format: Article
Language:English
Subjects:
Applied physics
Computer simulation
COMPUTERIZED SIMULATION
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COVALENCE
Covalent bonds
DIAMONDS
Electron states
ELECTRON-PHONON COUPLING
ELECTRONS
Engineering Science with specialization in Science of Electricity
MONTE CARLO METHOD
Monte Carlo simulation
PHONONS
POLARIZATION
POLARIZED PRODUCTS
RELAXATION TIME
SCATTERING
STABILITY
SYMMETRY
Teknisk fysik med inriktning mot elektricitetslära
Temperature dependence
Time dependence
TIME-OF-FLIGHT METHOD
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Summary:The stability of valley polarized electron states is crucial for the development of valleytronics. A long relaxation time of the valley polarization is required to enable operations to be performed on the polarized states. Here, we investigate the stability of valley polarized states in diamond, expressed as relaxation time. We have found that the stability of the states can be extremely long when we consider the electron-phonon scattering processes allowed by symmetry considerations. We determine electron-phonon coupling constants by Time-of-Flight measurements and Monte Carlo simulations and use these data to map out the relaxation time temperature dependency. The relaxation time for diamond can be microseconds or longer below 100 K and 100 V/cm due to the strong covalent bond, which is highly encouraging for future use in valleytronic applications.
ISSN:0003-6951
1077-3118
1077-3118
DOI:10.1063/1.4882649