Quantum Phenomena Emerging Near a Ferroelectric Critical Point in a Donor–Acceptor Organic Charge-Transfer Complex
RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
Flexible Electronics Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan
Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
Author to whom correspondence should be addressed.
Academic Editors: Anna Painelli and Alberto Girlando
Received: 13 March 2017 / Revised: 1 April 2017 / Accepted: 1 April 2017 / Published: 10 April 2017
When a second-order transition point is decreased to zero temperature, a continuous quantum phase transition between different ground states is realized at a quantum critical point (QCP). A recently synthesized organic charge-transfer complex, TTF-2,5-QBr
, provides a platform for the exploration of the quantum phenomena that accompany a ferroelectric QCP. Here, we summarize the recent results showing the quantum phenomena associated with the ferroelectric QCP in TTF-2,5-QBr
. Whereas the enhanced quantum fluctuations lead to quantitative changes in the critical exponents of the critical phenomena, they qualitatively change the nature of the domain-wall kinetics from thermally activated motion to temperature-independent tunneling motion. The present findings highlight the great influence of quantum fluctuations on the low-temperature physical properties and suggest that TTF-2,5-QBr
is a model system for the uniaxial ferroelectric QCP.
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MDPI and ACS Style
Kagawa, F.; Horiuchi, S.; Tokura, Y. Quantum Phenomena Emerging Near a Ferroelectric Critical Point in a Donor–Acceptor Organic Charge-Transfer Complex. Crystals 2017, 7, 106.
Kagawa F, Horiuchi S, Tokura Y. Quantum Phenomena Emerging Near a Ferroelectric Critical Point in a Donor–Acceptor Organic Charge-Transfer Complex. Crystals. 2017; 7(4):106.
Kagawa, Fumitaka; Horiuchi, Sachio; Tokura, Yoshinori. 2017. "Quantum Phenomena Emerging Near a Ferroelectric Critical Point in a Donor–Acceptor Organic Charge-Transfer Complex." Crystals 7, no. 4: 106.
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