scholarly journals Direct Observation at Room Temperature of the Orthorhombic Weyl Semimetal Phase in Thin Epitaxial MoTe2

2018 ◽  
Vol 28 (33) ◽  
pp. 1802084 ◽  
Author(s):  
Polychronis Tsipas ◽  
Sotirios Fragkos ◽  
Dimitra Tsoutsou ◽  
Carlos Alvarez ◽  
Roberto Sant ◽  
...  
Keyword(s):  
Direct Observation ◽  
Room Temperature ◽  
Weyl Semimetal

Direct observation of modulation structure in room-temperature multiferroic Bi4.2K0.8Fe2O9+δ

2021 ◽  
Vol 196 ◽  
pp. 113752
Author(s):  
Lu Zhang ◽  
Huanfang Tian ◽  
Sining Dong ◽  
Dong Yang ◽  
Xiaoguang Li ◽  
...  
Keyword(s):  
Direct Observation ◽  
Room Temperature

scholarly journals Direct Observation of Dynamic Symmetry Breaking above Room Temperature in Methylammonium Lead Iodide Perovskite

2016 ◽  
Vol 1 (4) ◽  
pp. 880-887 ◽  
Author(s):  
Alexander N. Beecher ◽  
Octavi E. Semonin ◽  
Jonathan M. Skelton ◽  
Jarvist M. Frost ◽  
Maxwell W. Terban ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Direct Observation ◽  
Room Temperature ◽  
Dynamic Symmetry ◽  
Lead Iodide ◽  
Methylammonium Lead Iodide

scholarly journals Quantized thermoelectric Hall effect induces giant power factor in a topological semimetal

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Fei Han ◽  
Nina Andrejevic ◽  
Thanh Nguyen ◽  
Vladyslav Kozii ◽  
Quynh T. Nguyen ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Hall Effect ◽  
Power Factor ◽  
Room Temperature ◽  
Waste Heat ◽  
Quantum Limit ◽  
Topological Materials ◽  
Weyl Semimetal ◽  
Topological Semimetals ◽  
Electronic Entropy

AbstractThermoelectrics are promising by directly generating electricity from waste heat. However, (sub-)room-temperature thermoelectrics have been a long-standing challenge due to vanishing electronic entropy at low temperatures. Topological materials offer a new avenue for energy harvesting applications. Recent theories predicted that topological semimetals at the quantum limit can lead to a large, non-saturating thermopower and a quantized thermoelectric Hall conductivity approaching a universal value. Here, we experimentally demonstrate the non-saturating thermopower and quantized thermoelectric Hall effect in the topological Weyl semimetal (WSM) tantalum phosphide (TaP). An ultrahigh longitudinal thermopower $$S_{xx} \sim 1.1 \times 10^3 \, \mu \, {\mathrm{V}} \, {\mathrm{K}}^{ - 1}$$ S x x ~ 1.1 × 1 0 3 μ V K − 1 and giant power factor $$\sim 525 \, \mu \, {\mathrm{W}} \, {\mathrm{cm}}^{ - 1} \, {\mathrm{K}}^{ - 2}$$ ~ 525 μ W cm − 1 K − 2 are observed at ~40 K, which is largely attributed to the quantized thermoelectric Hall effect. Our work highlights the unique quantized thermoelectric Hall effect realized in a WSM toward low-temperature energy harvesting applications.

scholarly journals A room-temperature ferroelectric semimetal

2019 ◽  
Vol 5 (7) ◽  
pp. eaax5080 ◽  
Author(s):  
Pankaj Sharma ◽  
Fei-Xiang Xiang ◽  
Ding-Fu Shao ◽  
Dawei Zhang ◽  
Evgeny Y. Tsymbal ◽  
...  
Keyword(s):  
First Principles ◽  
Electrical Transport ◽  
Room Temperature ◽  
Electric Polarization ◽  
First Principles Calculations ◽  
New Class ◽  
Weyl Semimetal ◽  
Ferroelectric Domain Structure ◽  
Ferroelectric Domains ◽  
Crystalline Metal

Coexistence of reversible polar distortions and metallicity leading to a ferroelectric metal, first suggested by Anderson and Blount in 1965, has so far remained elusive. Electrically switchable intrinsic electric polarization, together with the direct observation of ferroelectric domains, has not yet been realized in a bulk crystalline metal, although incomplete screening by mobile conduction charges should, in principle, be possible. Here, we provide evidence that native metallicity and ferroelectricity coexist in bulk crystalline van der Waals WTe2by means of electrical transport, nanoscale piezoresponse measurements, and first-principles calculations. We show that, despite being a Weyl semimetal, WTe2has switchable spontaneous polarization and a natural ferroelectric domain structure at room temperature. This new class of materials has tantalizing potential for functional nanoelectronics applications.

Direct observation of resistive switching memories behavior from nc-Si embedded in SiO2 at room temperature

2012 ◽  
Vol 358 (17) ◽  
pp. 2348-2352 ◽  
Author(s):  
Guoyin Xia ◽  
Zhongyuan Ma ◽  
Xiaofan Jiang ◽  
Huafeng Yang ◽  
Jun Xu ◽  
...  
Keyword(s):  
Resistive Switching ◽  
Direct Observation ◽  
Room Temperature

Direct Observation of Modulation Structure in Room Temperature Multiferroic Bi 4.2K 0.8Fe 2O 9+δ

2020 ◽  
Author(s):  
Lu Zhang ◽  
Huanfang Tian ◽  
Sining Dong ◽  
Dong Yang ◽  
Xiaoguang Li ◽  
...  
Keyword(s):  
Direct Observation ◽  
Room Temperature
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