Colored noise-controlled electroconvection

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05215
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Mathematical physics/Fundamental condensed matter physics
• Research Institution: Kyushu Institute of Technology
• Principal Investigator: Huh Jong-Hoon 九州工業大学, 大学院情報工学研究院, 教授 (50325578)
• Research Collaborator: Yano Yoshimitsu
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 液晶 / ノイズ / 電気対流 / 非平衡系 / 進行波 / カラーノイズ

Outline of Final Research Achievements

We investigated the influence of external noise on electroconvection patterns in liquid crystals.
1) By considering the characteristic time (or, cutoff frequency fc) of colored noise, the threshold of electroconvection was successfully explained, which had been limited in white noise. 2) In the case of the long characteristic times (i.e., low fc), the threshold was deviated from the revised theory considering colored noise, but it was able to be corrected by controlling the internal noise (i.e., thermal fluctuations of the director of liquid crystals) under a magnetic field. 3) Under appropriate colored noises, inverse stochastic resonance was discovered. 4) Defect-free electroconvection, which is realized in the one-dimensional cells employing the in-plane switching mode, elucidated the influence of noise on the traveling waves.

Free Research Field

非平衡系