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  • 1
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    Upper bound for the s−d exchange integral in n-(Ga,Mn)N:Si from magnetotransport studies (2015)
    American Physical Society (APS)
    Details
    Publication Date: 2015-05-15
    Description: Author(s): R. Adhikari, W. Stefanowicz, B. Faina, G. Capuzzo, M. Sawicki, T. Dietl, and A. Bonanni A series of recent magneto-optical studies pointed to contradicting values of the s − d exchange energy N 0 α in Mn-doped GaAs and GaN as well as in Fe-doped GaN. Here, a strong sensitivity of weak-localization phenomena to symmetry-breaking perturbations (such as spin-splitting and spin-disorder scatte... [Phys. Rev. B 91, 205204] Published Tue May 12, 2015
    Keywords: Semiconductors I: bulk
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Controlling a three dimensional electron slab of graded AlxGa1−xN (2016)
    American Institute of Physics (AIP)
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    Publication Date: 2016-01-12
    Description: Polarization induced degenerate n -type doping with electron concentrations up to ∼10 20  cm −3 is achieved in graded Al x Ga 1− x N layers ( x : 0% → 37%) grown on unintentionally doped and on n -doped GaN:Si buffer/reservoir layers by metal organic vapor phase epitaxy. High resolution x-ray diffraction, transmission electron microscopy, and electron dispersive x-ray spectroscopy confirm the gradient in the composition of the Al x Ga 1− x N layers, while Hall effect studies reveal the formation of a three dimensional electron slab, whose conductivity can be adjusted through the GaN(:Si) buffer/reservoir.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 3
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    Rashba semiconductor as spin Hall material: Experimental demonstration of spin pumping in wurtzite n-GaN:Si (2016)
    American Physical Society (APS)
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    Publication Date: 2016-09-01
    Description: Author(s): R. Adhikari, M. Matzer, A. Tarazaga Martín-Luengo, M. C. Scharber, and A. Bonanni Pure spin currents in semiconductors are essential for implementation in the next generation of spintronic elements. Heterostructures of III-nitride semiconductors are currently employed as central building blocks for lighting and high-power devices. Moreover, the long relaxation times and the spin-… [Phys. Rev. B 94, 085205] Published Wed Aug 31, 2016
    Keywords: Semiconductors I: bulk
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Conformation of a flexible polymer in explicit solvent: Accurate solvation potentials for Lennard-Jones chains (2015)
    American Institute of Physics (AIP)
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    Publication Date: 2015-11-24
    Description: The conformation of a polymer chain in solution is coupled to the local structure of the surrounding solvent and can undergo large changes in response to variations in solvent density and temperature. The many-body effects of solvent on the structure of an n -mer polymer chain can be formally mapped to an exact n -body solvation potential. Here, we use a pair decomposition of this n -body potential to construct a set of two-body potentials for a Lennard-Jones (LJ) polymer chain in explicit LJ solvent. The solvation potentials are built from numerically exact results for 5-mer chains in solvent combined with an approximate asymptotic expression for the solvation potential between sites that are distant along the chain backbone. These potentials map the many-body chain-in-solvent problem to a few-body single-chain problem and can be used to study a chain of arbitrary length, thereby dramatically reducing the computational complexity of the polymer chain-in-solvent problem. We have constructed solvation potentials at a large number of state points across the LJ solvent phase diagram including the vapor, liquid, and super-critical regions. We use these solvation potentials in single-chain Monte Carlo (MC) simulations with n ≤ 800 to determine the size, intramolecular structure, and scaling behavior of chains in solvent. To assess our results, we have carried out full chain-in-solvent MC simulations (with n ≤ 100) and find that our solvation potential approach is quantitatively accurate for a wide range of solvent conditions for these chain lengths.
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics (AIP)
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  • 5
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    Fast Bayesian inference of the multivariate Ornstein-Uhlenbeck process (2018)
    American Physical Society (APS)
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    Publication Date: 2018-07-27
    Description: Author(s): Rajesh Singh, Dipanjan Ghosh, and R. Adhikari The multivariate Ornstein-Uhlenbeck process is used in many branches of science and engineering to describe the regression of a system to its stationary mean. Here we present an O ( N ) Bayesian method to estimate the drift and diffusion matrices of the process from N discrete observations of a sample ... [Phys. Rev. E 98, 012136] Published Thu Jul 26, 2018
    Keywords: Statistical Physics
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    Repeated catastrophic valley infill following medieval earthquakes in the Nepal Himalaya (2015)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2015-12-18
    Description: Geomorphic footprints of past large Himalayan earthquakes are elusive, although they are urgently needed for gauging and predicting recovery times of seismically perturbed mountain landscapes. We present evidence of catastrophic valley infill following at least three medieval earthquakes in the Nepal Himalaya. Radiocarbon dates from peat beds, plant macrofossils, and humic silts in fine-grained tributary sediments near Pokhara, Nepal's second-largest city, match the timing of nearby M 〉 8 earthquakes in ~1100, 1255, and 1344 C.E. The upstream dip of tributary valley fills and x-ray fluorescence spectrometry of their provenance rule out local sources. Instead, geomorphic and sedimentary evidence is consistent with catastrophic fluvial aggradation and debris flows that had plugged several tributaries with tens of meters of calcareous sediment from a Higher Himalayan source 〉60 kilometers away.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schwanghart, Wolfgang -- Bernhardt, Anne -- Stolle, Amelie -- Hoelzmann, Philipp -- Adhikari, Basanta R -- Andermann, Christoff -- Tofelde, Stefanie -- Merchel, Silke -- Rugel, Georg -- Fort, Monique -- Korup, Oliver -- New York, N.Y. -- Science. 2016 Jan 8;351(6269):147-50. doi: 10.1126/science.aac9865. Epub 2015 Dec 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Earth and Environmental Science, University of Potsdam, Potsdam, Germany. w.schwanghart@geo.uni-potsdam.de. ; Institute of Earth and Environmental Science, University of Potsdam, Potsdam, Germany. ; Institute of Geographical Sciences, Freie Universitat Berlin, Berlin, Germany. ; Institute of Engineering, Tribhuvan University, Kathmandu, Nepal. ; Helmholtz-Zentrum Potsdam, German Centre for Geosciences GFZ, Germany. ; Helmholtz-Zentrum Dresden-Rossendorf, Helmholtz Institute Freiberg for Resource Technology, Dresden, Germany. ; CNRS UMR 8586 Prodig, Departement de Geographie, Universite Paris-Diderot-SPC, Paris, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26676354" target="_blank"〉PubMed〈/a〉
    Keywords: Cities ; Disasters/*history ; Earthquakes/*history/mortality ; Fossils ; Geologic Sediments/chemistry ; History, Medieval ; Humans ; Nepal ; Plants/chemistry ; Radiometric Dating ; Rivers ; Soil/chemistry ; Spectrometry, X-Ray Emission
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Kumar, Adhikari, and Dua Reply: (2017)
    American Physical Society (APS)
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    Publication Date: 2017-09-02
    Description: Author(s): Ashutosh Kumar, R. Adhikari, and Arti Dua [Phys. Rev. Lett. 119, 099802] Published Thu Aug 31, 2017
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 8
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    Universal Hydrodynamic Mechanisms for Crystallization in Active Colloidal Suspensions (2016)
    American Physical Society (APS)
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    Publication Date: 2016-11-24
    Description: Author(s): Rajesh Singh and R. Adhikari The lack of detailed balance in active colloidal suspensions allows dissipation to determine stationary states. Here we show that slow viscous flow produced by polar or apolar active colloids near plane walls mediates attractive hydrodynamic forces that drive crystallization. Hydrodynamically mediat… [Phys. Rev. Lett. 117, 228002] Published Wed Nov 23, 2016
    Keywords: Polymer, Soft Matter, Biological, Climate, and Interdisciplinary Physics
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 9
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    Should coastal planners have concern over where land ice is melting? (2017)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2017-11-16
    Description: There is a general consensus among Earth scientists that melting of land ice greatly contributes to sea-level rise (SLR) and that future warming will exacerbate the risks posed to human civilization. As land ice is lost to the oceans, both the Earth’s gravitational and rotational potentials are perturbed, resulting in strong spatial patterns in SLR, termed sea-level fingerprints. We lack robust forecasting models for future ice changes, which diminishes our ability to use these fingerprints to accurately predict local sea-level (LSL) changes. We exploit an advanced mathematical property of adjoint systems and determine the exact gradient of sea-level fingerprints with respect to local variations in the ice thickness of all of the world’s ice drainage systems. By exhaustively mapping these fingerprint gradients, we form a new diagnosis tool, henceforth referred to as gradient fingerprint mapping (GFM), that readily allows for improved assessments of future coastal inundation or emergence. We demonstrate that for Antarctica and Greenland, changes in the predictions of inundation at major port cities depend on the location of the drainage system. For example, in London, GFM shows LSL that is significantly affected by changes on the western part of the Greenland Ice Sheet (GrIS), whereas in New York, LSL change predictions are greatly sensitive to changes in the northeastern portions of the GrIS. We apply GFM to 293 major port cities to allow coastal planners to readily calculate LSL change as more reliable predictions of cryospheric mass changes become available.
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
    Published by American Association for the Advancement of Science (AAAS)
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  • 10
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    Direct verification of the fluctuation-dissipation relation in viscously coupled oscillators (2017)
    American Physical Society (APS)
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    Publication Date: 2017-11-11
    Description: Author(s): Shuvojit Paul, Abhrajit Laskar, Rajesh Singh, Basudev Roy, R. Adhikari, and Ayan Banerjee The fluctuation-dissipation relation, a central result in nonequilibrium statistical physics, relates equilibrium fluctuations in a system to its linear response to external forces. Here we provide a direct experimental verification of this relation for viscously coupled oscillators, as realized by ... [Phys. Rev. E 96, 050102(R)] Published Fri Nov 10, 2017
    Keywords: Statistical Physics
    Print ISSN: 1539-3755
    Electronic ISSN: 1550-2376
    Topics: Physics
    Published by American Physical Society (APS)
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