The oxyborate FeOBO presents a charge density wave (CDW) transition close to room temperature. As we show here, this is associated with a well defined anomaly in the specific heat. Below this transition, when applying in a single crystal of FeOBO a DC voltage above a temperature dependent threshold, a high current is liberated in this material. We study the conduction in single crystals of FeOBO with voltage applied parallel and perpendicular to the crystallographic c axis direction. The observed currents are attributed to the depinning of charge ordered domains above a threshold voltage V that gives rise to a collective conduction due to coherent domains. Compliance limited DC data shows that above a lower threshold voltage depinning is smooth and follows a power law scaling. Similar depinning with power law scaling is also revealed in the AC conductivity.
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http://dx.doi.org/10.1088/1361-648X/aa6960 | DOI Listing |
J Phys Condens Matter
September 2024
School of Physical Science and Technology, Soochow University, Suzhou 215006, People's Republic of China.
Nonlinear transport behavior is one of the signatures of the formation of electronic crystals such as charge density wave (CDW), as it provides evidence for their collective motion. Such experimental evidence has been widely reported in quasi-one-dimensional (1D) materials but is rarely studied in 2D systems. Only a few studies on the RTematerials have been previsouly reported.
View Article and Find Full Text PDFSci Adv
July 2023
Department of Physics, Van der Waals Materials Research Center, Yonsei University, Seoul 03722, Republic of Korea.
Graphene, with superior electrical tunabilities, has arisen as a multifunctional insertion layer in vertically stacked devices. Although the role of graphene inserted in metal-semiconductor junctions has been well investigated in quasi-static charge transport regime, the implication of graphene insertion at ultrahigh frequencies has rarely been considered. Here, we demonstrate the diode operation of vertical Pt/n-MoSe/graphene/Au assemblies at ~200-GHz cutoff frequency (f).
View Article and Find Full Text PDFPhys Rev Lett
June 2023
Department of Mathematics, King's College London, London WC2R 2LS, United Kingdom.
We introduce a simple model of diffusive jump process where a fee is charged for each jump. The nonlinear cost function is such that slow jumps incur a flat fee, while for fast jumps the cost is proportional to the velocity of the jump. The model-inspired by the way taxi meters work-exhibits a very rich behavior.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
February 2023
Hunan Joint International Research Center for Carbon Dioxide Resource Utilization, State Key Laboratory of Powder Metallurgy, School of Physics and Electronics, Central South University, Changsha, 410083, Hunan, P.R. China.
Photoelectrochemical (PEC) water splitting is a promising approach for renewable solar light conversion. However, surface Fermi level pinning (FLP), caused by surface trap states, severely restricts the PEC activities. Theoretical calculations indicate subsurface oxygen vacancy (sub-O ) could release the FLP and retain the active structure.
View Article and Find Full Text PDFRep Prog Phys
August 2022
Laboratoire de physique, Département de physique de l'ENS, École normale supérieure, UPMC Univ. Paris 06, CNRS, PSL Research University, 75005 Paris, France.
Domain walls in magnets, vortex lattices in superconductors, contact lines at depinning, and many other systems can be modeled as an elastic system subject to quenched disorder. The ensuing field theory possesses a well-controlled perturbative expansion around its upper critical dimension. Contrary to standard field theory, the renormalization group (RG) flow involves a function, the disorder correlator Δ(), and is therefore termed the functional RG.
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