Microscopic physical origin of polarization induced large tunneling electroresistance in tetragonal-phase BiFeO3

AbstractThe most characteristic hallmark of life is its homochirality: all biomolecules are usually of one hand, e.g. on Earth life uses only L-amino acids for protein synthesis and not their D mirror images. We therefore suggest that a search for extra-terrestrial life can be approached as a Search for Extra- Terrestrial Homochirality (SETH). The natural choice for a SETH instrument is optical rotation, and we describe a novel miniaturized space polarimeter, called the SETH Cigar, which could be used to detect optical rotation as the homochiral signature of life on other planets. Moving parts are avoided by replacing the normal rotating polarizer by multiple fixed polarizers at different angles as in the eye of the bee. We believe that homochirality may be found in the subsurface layers on Mars as a relic of extinct life, and on other solar system bodies as a sign of advanced pre-biotic chemistry. We discuss the chiral GC-MS planned for the Roland lander of the Rosetta mission to a comet and conclude with theories of the physical origin of homochirality.

Download Full-text

Ferroelectric Domain Structure of Pb(Zr.52Ti.48)03

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s1431927600000933 ◽

1980 ◽

Vol 38 ◽

pp. 214-215

Author(s):

E.K. Goo ◽

R.K. Mishra

Keyword(s):

Phase Transformation ◽

Domain Structure ◽

Tetragonal Phase ◽

Ferroelectric Domain ◽

Cubic Phase ◽

Ion Milling ◽

Thin Foils ◽

Ferroelectric Domain Structure ◽

Ferroelectric Domains

Ferroelectric domains are twins that are formed when PZT undergoes a phase transformation from a non-ferroelectric cubic phase to a ferroelectric tetragonal phase upon cooling below ∼375°C.,1 The tetragonal phase is spontaneously polarized in the direction of c-axis, making each twin a ferroelectric domain. Thin foils of polycrystalline Pb (Zr.52Ti.48)03 were made by ion milling and observed in the Philips EM301 with a double tilt stage.

Download Full-text

The physical origin of hydrophobicity

Biochemistry & Molecular Biology Journal ◽

10.21767/2471-8084-c1-008 ◽

2018 ◽

Vol 04 ◽

Author(s):

Joze Grdadolnik ◽

Franci Merzel ◽

Franc Avbelj

Keyword(s):

Physical Origin

Download Full-text

Phase transformation and preferred orientation in carboxylate derived ZrO2 thin films on silicon substates

Journal of Materials Research ◽

10.1557/jmr.1992.3065 ◽

1992 ◽

Vol 7 (11) ◽

pp. 3065-3071 ◽

Cited By ~ 4

Author(s):

Peir-Yung Chu ◽

Isabelle Campion ◽

Relva C. Buchanan

Keyword(s):

Thin Films ◽

Heat Treatment ◽

Phase Transformation ◽

Heating Rate ◽

Tetragonal Phase ◽

Monoclinic Phase ◽

Preferred Orientation ◽

Si Substrate ◽

Interfacial Diffusion ◽

Deposited Films

Phase transformation and preferred orientation in ZrO2 thin films, deposited on Si(111) and Si(100) substrates, and prepared by heat treatment from carboxylate solution precursors were investigated. The deposited films were amorphous below 450 °C, transforming gradually to the tetragonal and monoclinic phases on heating. The monoclinic phase developed from the tetragonal phase displacively, and exhibited a strong (111) preferred orientation at temperature as low as 550 °C. The degree of preferred orientation and the tetragonal-to-monoclinic phase transformation were controlled by heating rate, soak temperature, and time. Interfacial diffusion into the film from the Si substrate was negligible at 700 °C and became significant only at 900 °C, but for films thicker than 0.5 μm, overall preferred orientation exceeded 90%.

Download Full-text

Insights into the Correlation between Tetragonal Phase and Temperature Stability of Potassium Sodium Niobate Based Ceramics from Domain Behaviors

Advanced Electronic Materials ◽

10.1002/aelm.202100257 ◽

2021 ◽

pp. 2100257

Author(s):

Haoyue Xue ◽

Ting Zheng ◽

Jiagang Wu

Keyword(s):

Tetragonal Phase ◽

Temperature Stability ◽

Sodium Niobate ◽

Potassium Sodium Niobate ◽

Potassium Sodium

Download Full-text

Physical origin of the anomalous temperature dependence of the1Syellow exciton luminescence intensity inCu2O

Physical Review B ◽

10.1103/physrevb.25.5519 ◽

1982 ◽

Vol 25 (8) ◽

pp. 5519-5522 ◽

Cited By ~ 33

Author(s):

N. Caswell ◽

P. Y. Yu

Keyword(s):

Temperature Dependence ◽

Luminescence Intensity ◽

Anomalous Temperature Dependence ◽

Exciton Luminescence ◽

Physical Origin ◽

Anomalous Temperature

Download Full-text

Polaritonic XY-Ising machine

Nanophotonics ◽

10.1515/nanoph-2020-0162 ◽

2020 ◽

Vol 9 (13) ◽

pp. 4127-4138 ◽

Cited By ~ 2

Author(s):

Kirill P. Kalinin ◽

Alberto Amo ◽

Jacqueline Bloch ◽

Natalia G. Berloff

Keyword(s):

Dissipative Systems ◽

Phase Information ◽

Physical Origin ◽

Continuous Spin ◽

Network Nodes ◽

Computing Platform ◽

Ability To Act ◽

Spin Hamiltonians ◽

Long Range Interactions ◽

Accuracy And Stability

AbstractGain-dissipative systems of various physical origin have recently shown the ability to act as analogue minimisers of hard combinatorial optimisation problems. Whether or not these proposals will lead to any advantage in performance over the classical computations depends on the ability to establish controllable couplings for sufficiently dense short- and long-range interactions between the spins. Here, we propose a polaritonic XY-Ising machine based on a network of geometrically isolated polariton condensates capable of minimising discrete and continuous spin Hamiltonians. We elucidate the performance of the proposed computing platform for two types of couplings: relative and absolute. The interactions between the network nodes might be controlled by redirecting the emission between the condensates or by sending the phase information between nodes using resonant excitation. We discuss the conditions under which the proposed machine leads to a pure polariton simulator with pre-programmed couplings or results in a hybrid classical polariton simulator. We argue that the proposed architecture for the remote coupling control offers an improvement over geometrically coupled condensates in both accuracy and stability as well as increases versatility, range, and connectivity of spin Hamiltonians that can be simulated with polariton networks.

Download Full-text

Strong and tunable spin–orbit interaction in a single crystalline InSb nanosheet

npj 2D Materials and Applications ◽

10.1038/s41699-020-00184-y ◽

2021 ◽

Vol 5 (1) ◽

Author(s):

Yuanjie Chen ◽

Shaoyun Huang ◽

Dong Pan ◽

Jianhong Xue ◽

Li Zhang ◽

...

Keyword(s):

Layer Structure ◽

Orbit Interaction ◽

Spin Orbit ◽

Device Layer ◽

Physical Origin ◽

Quantum Devices ◽

Spin Orbit Interaction ◽

Topological Quantum ◽

Narrow Bandgap ◽

Dual Gate

AbstractA dual-gate InSb nanosheet field-effect device is realized and is used to investigate the physical origin and the controllability of the spin–orbit interaction in a narrow bandgap semiconductor InSb nanosheet. We demonstrate that by applying a voltage over the dual gate, efficiently tuning of the spin–orbit interaction in the InSb nanosheet can be achieved. We also find the presence of an intrinsic spin–orbit interaction in the InSb nanosheet at zero dual-gate voltage and identify its physical origin as a build-in asymmetry in the device layer structure. Having a strong and controllable spin–orbit interaction in an InSb nanosheet could simplify the design and realization of spintronic deceives, spin-based quantum devices, and topological quantum devices.

Download Full-text