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  1. Book ; Online: Frequency-dependent Faraday and Kerr rotation in anisotropic nonsymmorphic Dirac semimetals

    Chakraborty, Amarnath / Bian, Guang / Vignale, Giovanni

    2023  

    Abstract: We calculate the frequency-dependent longitudinal and Hall conductivities and the Faraday and Kerr rotation angles for a single sheet of anisotropic Dirac semimetal protected by nonsymmorphic symmetry in the presence of a Zeeman term coupling to the out- ... ...

    Abstract We calculate the frequency-dependent longitudinal and Hall conductivities and the Faraday and Kerr rotation angles for a single sheet of anisotropic Dirac semimetal protected by nonsymmorphic symmetry in the presence of a Zeeman term coupling to the out-of-plane component of the spin. While the Zeeman term causes a rotation of the plane of polarization of the light, the anisotropy causes the appearance of an elliptically polarized component in an initially linearly polarized beam. The two effects can be combined in a single complex Faraday rotation angle. At the zero-frequency limit, we find a finite value of the Faraday rotation angle, which is given by $2\alpha_F$, where $\alpha_F$ is the effective fine structure constant associated with the velocity of the linearly dispersing Dirac fermions. We also find a logarithmic enhancement of the Faraday (and Kerr) rotation angles as the frequency of the light approaches the absorption edge associated with the Zeeman-induced gap. While the enhancement is reduced by impurity scattering, it remains significant for an attainable level of material purity. These results indicate that two-dimensional Dirac materials protected by nonsymmorphic symmetry are responsive to Zeeman couplings and can be used as platforms for magneto-optic applications, such as the realization of polarization-rotating devices.

    Comment: 25 pages, 7 Figures
    Keywords Condensed Matter - Mesoscale and Nanoscale Physics ; Condensed Matter - Materials Science ; Condensed Matter - Strongly Correlated Electrons ; Physics - Optics
    Subject code 535
    Publishing date 2023-02-10
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article: An extension of cancer immunotherapy with dostarlimab, the PD1-PD L1 pathway blocker.

    Biswas, Sitangshu Sekhar / BabuV, Sarath / Chakraborty, Abhipsa / Chakraborty, Amarnath / Jayashankar, Hasheetha / Swamynathan, Kudiyarasan

    Heliyon

    2023  Volume 9, Issue 12, Page(s) e23169

    Abstract: Cancer immunotherapy is a treatment that uses the body's own immune system to fight against cancer. Malignant cells in the human body have the ability to mutate themselves in such a way that they can escape from immune system surveillance and proliferate. ...

    Abstract Cancer immunotherapy is a treatment that uses the body's own immune system to fight against cancer. Malignant cells in the human body have the ability to mutate themselves in such a way that they can escape from immune system surveillance and proliferate. So, if the human immune system could be boosted or its surveillance and defensive mechanisms improved so that our bodies can detect cancer cells and kill them by combining all of the human body's defensive mechanisms, it would be much easier to deal with cancer. A recent trial at Memorial Sloan Kettering Cancer Center in New York found that by using a drug called Dostarlimab, rectal adenocarcinoma could be cured by boosting the human immune system to detect and kill cancer cells. This could be considered a validated extension of cancer immunotherapy. This paper will explain how dostarlimab works on the body's immune system and destroys cancer cells in a simple way that anyone who is not in the medical field also can understand.
    Language English
    Publishing date 2023-12-01
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 2835763-2
    ISSN 2405-8440
    ISSN 2405-8440
    DOI 10.1016/j.heliyon.2023.e23169
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Label-Free Cysteamine-Capped Silver Nanoparticle-Based Colorimetric Assay for Hg(II) Detection in Water with Subnanomolar Exactitude

    Bhattacharjee, Yudhajit / Chakraborty Amarnath

    ACS sustainable chemistry . 2014 Sept. 02, v. 2, no. 9

    2014  

    Abstract: Precisely probing heavy metal pollutants in water warrants novel methods and materials. To this end, functionalization of nanoparticles using biologically important substances through a green route is a novel aspect in the design of an optical sensor. In ...

    Abstract Precisely probing heavy metal pollutants in water warrants novel methods and materials. To this end, functionalization of nanoparticles using biologically important substances through a green route is a novel aspect in the design of an optical sensor. In this article we report a green preparative strategy for the synthesis of cysteamine stabilized silver nanoparticles (Ag-Nps) in aqueous medium. The water-soluble Ag-Nps are found to be highly sensitive and selective for rapid colorimetric detection of Hg(II) ion with a limit of detection (LOD) of 0.273 nM (55 ppt). This system also enables us to detect Hg(II) through the naked eye with an LOD of 2.73 nM (0.55 ppb) which is below the World Health Organization (WHO) permissible limit (10 nM or 2 ppb). Cysteamine undergoes cooperative coordination with the mercury ion leading to spontaneous formation of a mercury–cysteamine complex and consequently forms Ag–Hg nanoalloy, which in turn changes the surface plasmon property of Ag-Nps to allow detection of Hg(II) ion with subnanomolar precision. Furthermore, Ag-Nps were tested for detection of Hg(II) in different real water samples with satisfying recoveries over 96–102%.
    Keywords alloy nanoparticles ; colorimetry ; cysteamine ; detection limit ; heavy metals ; mercury ; nanosilver ; pollutants ; silver ; World Health Organization
    Language English
    Dates of publication 2014-0902
    Size p. 2149-2154.
    Publishing place American Chemical Society
    Document type Article
    ISSN 2168-0485
    DOI 10.1021/sc500339n
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Solvent free, phosphine free Pd-catalyzed annulations of aryl bromides with diarylacetylenes

    Bej, Ansuman / Chakraborty, Amarnath / Sarkar, Amitabha

    RSC advances. 2013 Aug. 19, v. 3, no. 36

    2013  

    Abstract: Palladium nanoparticles and sodium acetate catalyze the reaction of aryl bromide with diarylacetylene to produce annulated products in good yield. One equivalent of PEG-600 serves as the solvent. This procedure is compatible with a wide variety of ... ...

    Abstract Palladium nanoparticles and sodium acetate catalyze the reaction of aryl bromide with diarylacetylene to produce annulated products in good yield. One equivalent of PEG-600 serves as the solvent. This procedure is compatible with a wide variety of functional groups.
    Keywords bromides ; catalytic activity ; moieties ; nanoparticles ; palladium ; phosphine ; sodium acetate ; solvents
    Language English
    Dates of publication 2013-0819
    Size p. 15812-15819.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ISSN 2046-2069
    DOI 10.1039/c3ra41924j
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  5. Book ; Online: Observation of 2D Weyl Fermion States in Epitaxial Bismuthene

    Lu, Qiangsheng / Reddy, P. V. Sreenivasa / Jeon, Hoyeon / Mazza, Alessandro R. / Brahlek, Matthew / Wu, Weikang / Yang, Shengyuan A. / Cook, Jacob / Conner, Clayton / Zhang, Xiaoqian / Chakraborty, Amarnath / Yao, Yueh-Ting / Tien, Hung-Ju / Tseng, Chun-Han / Yang, Po-Yuan / Lien, Shang-Wei / Lin, Hsin / Chiang, Tai-Chang / Vignale, Giovanni /
    Li, An-Ping / Chang, Tay-Rong / Moore, Rob G. / Bian, Guang

    2023  

    Abstract: A two-dimensional (2D) Weyl semimetal featuring a spin-polarized linear band dispersion and a nodal Fermi surface is a new topological phase of matter. It is a solid-state realization of Weyl fermions in an intrinsic 2D system. The nontrivial topology of ...

    Abstract A two-dimensional (2D) Weyl semimetal featuring a spin-polarized linear band dispersion and a nodal Fermi surface is a new topological phase of matter. It is a solid-state realization of Weyl fermions in an intrinsic 2D system. The nontrivial topology of 2D Weyl cones guarantees the existence of a new form of topologically protected boundary states, Fermi string edge states. In this work, we report the realization of a 2D Weyl semimetal in monolayer-thick epitaxial bismuthene grown on SnS(Se) substrate. The intrinsic band gap of bismuthene is eliminated by the space-inversion-symmetry-breaking substrate perturbations, resulting in a gapless spin-polarized Weyl band dispersion. The linear dispersion and spin polarization of the Weyl fermion states are observed in our spin and angle-resolved photoemission measurements. In addition, the scanning tunneling microscopy/spectroscopy reveals a pronounced local density of states at the edge, suggesting the existence of Fermi string edge states. These results open the door for the experimental exploration of the exotic properties of Weyl fermion states in reduced dimensions.

    Comment: 5 figures
    Keywords Condensed Matter - Materials Science ; Condensed Matter - Mesoscale and Nanoscale Physics
    Subject code 530 ; 539
    Publishing date 2023-03-06
    Publishing country us
    Document type Book ; Online
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  6. Article ; Online: A new synthetic route to Lindqvist type clusters [(n-Bu4N)x][M'M5O19] [when x = 2, M' = M = Mo or W; x = 3, M' = Mo, M = W] from metal carbonyl precursors [(CO)5ML] [M = Mo, W; L= CO, C(OMe)(Me)].

    Thakur, Arunabha / Chakraborty, Amarnath / Ramkumar, V / Ghosh, Sundargopal

    Dalton transactions (Cambridge, England : 2003)

    2009  , Issue 36, Page(s) 7552–7558

    Abstract: Two fully oxidized [(n-Bu4N)2][Mo6O19], 7 and [(n-Bu4N)2][W6O19], 8 and one mixed-metal, mixed-valence one electron reduced [(n-Bu4N)3][MoW5O19], 9 cluster have been synthesized under biphasic reaction conditions from group VI metal carbonyls or Fischer ... ...

    Abstract Two fully oxidized [(n-Bu4N)2][Mo6O19], 7 and [(n-Bu4N)2][W6O19], 8 and one mixed-metal, mixed-valence one electron reduced [(n-Bu4N)3][MoW5O19], 9 cluster have been synthesized under biphasic reaction conditions from group VI metal carbonyls or Fischer carbene complexes, [(CO)5M=C(OMe)Me] (M = Mo, W) in yields of 73, 77 and 71% respectively. All the clusters have been characterized by IR, 1H and 13C NMR spectra, and crystal structure determinations. Additionally, the composition of 9 has also been supported by mass spectrometry (MALDI-TOF), inductively coupled plasma (ICP) and energy-dispersive X-ray (EDX) analysis. This novel and mild route offers distinct improvements over earlier methods of synthesis for Lindqvist type mixed-valence mixed-metal polyoxometalate cluster.
    Language English
    Publishing date 2009-09-28
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472887-4
    ISSN 1477-9234 ; 1364-5447 ; 0300-9246 ; 1477-9226
    ISSN (online) 1477-9234 ; 1364-5447
    ISSN 0300-9246 ; 1477-9226
    DOI 10.1039/b908348k
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: A new bio-active surface for protein immobilisation via copper-free ‘click’ between azido SAM and alkynyl Fischer carbene complex

    Sawoo, Sudeshna / Dutta, Piyali / Chakraborty, Amarnath / Mukhopadhyay, Rupa / Bouloussa, Othman / Sarkar, Amitabha

    Chemical communications. 2008 Nov. 20, , no. 45

    2008  

    Abstract: Fischer carbene complex anchored on glass or silicon surface using a Cu-free ‘click’ reaction allows facile and swift covalent grafting of protein molecules like Bovine Serum Albumin (BSA). ...

    Abstract Fischer carbene complex anchored on glass or silicon surface using a Cu-free ‘click’ reaction allows facile and swift covalent grafting of protein molecules like Bovine Serum Albumin (BSA).
    Keywords bovine serum albumin ; carbenes ; chemical reactions ; glass ; silicon
    Language English
    Dates of publication 2008-1120
    Size p. 5957-5959.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 1472881-3
    ISSN 1364-548X ; 1359-7345 ; 0009-241X
    ISSN (online) 1364-548X
    ISSN 1359-7345 ; 0009-241X
    DOI 10.1039/b813296h
    Database NAL-Catalogue (AGRICOLA)

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  8. Article: A new bio-active surface for protein immobilisation via copper-free 'click' between azido SAM and alkynyl Fischer carbene complex.

    Sawoo, Sudeshna / Dutta, Piyali / Chakraborty, Amarnath / Mukhopadhyay, Rupa / Bouloussa, Othman / Sarkar, Amitabha

    Chemical communications (Cambridge, England)

    2008  , Issue 45, Page(s) 5957–5959

    Abstract: Fischer carbene complex anchored on glass or silicon surface using a Cu-free 'click' reaction allows facile and swift covalent grafting of protein molecules like Bovine Serum Albumin (BSA). ...

    Abstract Fischer carbene complex anchored on glass or silicon surface using a Cu-free 'click' reaction allows facile and swift covalent grafting of protein molecules like Bovine Serum Albumin (BSA).
    MeSH term(s) Animals ; Azides/chemical synthesis ; Azides/chemistry ; Cattle ; Dansyl Compounds/chemical synthesis ; Dansyl Compounds/chemistry ; Immobilized Proteins/chemistry ; Methane/analogs & derivatives ; Methane/chemistry ; Serum Albumin, Bovine/chemistry ; Silicates/chemical synthesis ; Silicates/chemistry ; Spectrometry, Fluorescence
    Chemical Substances Azides ; Dansyl Compounds ; Immobilized Proteins ; Silicates ; carbene (2465-56-7) ; Serum Albumin, Bovine (27432CM55Q) ; Methane (OP0UW79H66) ; dansyl chloride (QMU9166TJ4)
    Language English
    Publishing date 2008-12-07
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1472881-3
    ISSN 1364-548X ; 1359-7345 ; 0009-241X
    ISSN (online) 1364-548X
    ISSN 1359-7345 ; 0009-241X
    DOI 10.1039/b813296h
    Database MEDical Literature Analysis and Retrieval System OnLINE

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