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Induced magnetism versus Kondo screening in alternating Mott-metal layers (2013)

Aleksander Zujev and Pinaki Sengupta

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2013-09-13

Description: Author(s): Aleksander Zujev and Pinaki Sengupta We investigate the magnetic properties of a heterostructure comprised of alternating metallic and Mott insulating layers of fermions with varying interlayer hybridization. Results from large-scale quantum Monte Carlo simulations at half-filling show clear evidence of induced magnetism in the metalli... [Phys. Rev. B 88, 094415] Published Thu Sep 12, 2013

Keywords: Magnetism

Print ISSN: 1098-0121

Electronic ISSN: 1095-3795

Topics: Physics

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Probing supersymmetry using event shape variables at the 8 TeV LHC (2012)

Rajdeep M. Chatterjee, Monoranjan Guchait, and Dipan Sengupta

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-10-11

Description: Author(s): Rajdeep M. Chatterjee, Monoranjan Guchait, and Dipan Sengupta We have revisited the prospects of supersymmetry searches at the LHC with 7 TeV energy along with the prediction of the discovery potential at 8 TeV energy assuming an integrated luminosity 5 fb -1 and 20 fb -1 with minimal supergravity/minimal supersymmetric standard model as a model framework. We ... [Phys. Rev. D 86, 075014] Published Wed Oct 10, 2012

Keywords: Beyond the standard model

Print ISSN: 0556-2821

Electronic ISSN: 1089-4918

Topics: Physics

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How constrained is the constrained MSSM? (2012)

Diptimoy Ghosh, Monoranjan Guchait, Sreerup Raychaudhuri, and Dipan Sengupta

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-09-11

Description: Author(s): Diptimoy Ghosh, Monoranjan Guchait, Sreerup Raychaudhuri, and Dipan Sengupta We study the allowed parameter space of the constrained minimal supersymmetric Standard Model (cMSSM) in the light of direct searches, constraints from B -physics (including the recent measurement of the branching ratio for B s → μ + μ - ) and the dark matter relic density. For low or moderate values of tan... [Phys. Rev. D 86, 055007] Published Mon Sep 10, 2012

Keywords: Beyond the standard model

Print ISSN: 0556-2821

Electronic ISSN: 1089-4918

Topics: Physics

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Low-temperature thermodynamic properties near the field-induced quantum critical point in NiCl_{2}-4SC(NH_{2})_{2} (2012)

Franziska Weickert, Robert Küchler, Alexander Steppke, Luis Pedrero, Michael Nicklas, Manuel Brando, Frank Steglich, Marcelo Jaime, Vivien S. Zapf, Armando Paduan-Filho, Khaled A. Al-Hassanieh, Cristian D. Batista, and Pinaki Sengupta

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-05-09

Description: Author(s): Franziska Weickert, Robert Küchler, Alexander Steppke, Luis Pedrero, Michael Nicklas, Manuel Brando, Frank Steglich, Marcelo Jaime, Vivien S. Zapf, Armando Paduan-Filho, Khaled A. Al-Hassanieh, Cristian D. Batista, and Pinaki Sengupta We present a comprehensive experimental and theoretical investigation of the thermodynamic properties: specific heat, magnetization, and thermal expansion in the vicinity of the field-induced quantum critical point (QCP) around the lower critical field H c 1 ≈2 T in NiCl 2 -4SC(NH 2 ) 2 . A T 3/2 behavior in ... [Phys. Rev. B 85, 184408] Published Tue May 08, 2012

Keywords: Magnetism

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Probing a mixed neutralino dark matter model at the 7 TeV LHC (2012)

Monoranjan Guchait, D. P. Roy, and Dipan Sengupta

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-23

Description: Author(s): Monoranjan Guchait, D. P. Roy, and Dipan Sengupta We have analyzed the prospect of probing a nonuniversal gaugino mass model of mixed bino-Higgsino dark matter at the current 7 TeV run of LHC. It provides cosmologically compatible dark matter relic density over two broad bands of parameters, corresponding to m g ˜ 〈 m q ˜ and m g ˜ ∼ m q ˜ . The supersymmetr... [Phys. Rev. D 85, 035024] Published Wed Feb 22, 2012

Keywords: Beyond the standard model

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Electronic ISSN: 1089-4918

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Event-shape selection cuts for supersymmetry searches at the LHC with 7 TeV energy (2011)

Monoranjan Guchait and Dipan Sengupta

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2011-09-14

Description: Author(s): Monoranjan Guchait and Dipan Sengupta We investigate the prospects of supersymmetry searches at the LHC with 7 TeV energy. A new set of selection cuts is proposed based on event shapes to control backgrounds. Our preliminary studies show that it is possible to minimize backgrounds to a significantly low level and a conservative estimate... [Phys. Rev. D 84, 055010] Published Tue Sep 13, 2011

Keywords: Beyond the standard model

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Magnetoelectric effects in an organometallic quantum magnet (2011)

V. S. Zapf, P. Sengupta, C. D. Batista, F. Nasreen, F. Wolff-Fabris, and A. Paduan-Filho

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-04-15

Description: Author(s): V. S. Zapf, P. Sengupta, C. D. Batista, F. Nasreen, F. Wolff-Fabris, and A. Paduan-Filho Metal-organic materials constitute a new field in which to search for ferroelectricity and coupling between electricity and magnetism. We observe a magnetic field-induced change in the electric polarization, ΔP(H), that reaches 50 μC/m^{2} in single crystals of NiCl_{2} –4SC(NH_{2} )_{2} (DTN). ... [Phys. Rev. B 83, 140405] Published Thu Apr 14, 2011

Keywords: Magnetism

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Interplay between crystal electric field and magnetic exchange anisotropies in the heavy-fermion antiferromagnet YbRhSb under pressure (2012)

K. Umeo, H. Yamane, H. Kubo, Y. Muro, F. Nakamura, T. Suzuki, T. Takabatake, K. Sengupta, M. K. Forthaus, and M. M. Abd-Elmeguid

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-01-13

Description: Author(s): K. Umeo, H. Yamane, H. Kubo, Y. Muro, F. Nakamura, T. Suzuki, T. Takabatake, K. Sengupta, M. K. Forthaus, and M. M. Abd-Elmeguid [Phys. Rev. B 85, 024412] Published Thu Jan 12, 2012

Keywords: Magnetism

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Suppressing defect production during passage through a quantum critical point (2014)

Jay D. Sau and K. Sengupta

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-09-23

Description: Author(s): Jay D. Sau and K. Sengupta We show that a closed quantum system driven through a quantum critical point with two rates ω1 (which controls its proximity to the quantum critical point) and ω2 (which controls the dispersion of the low-energy quasiparticles at the critical point) exhibits novel scaling laws for defect density n a... [Phys. Rev. B 90, 104306] Published Mon Sep 22, 2014

Keywords: Dynamics, dynamical systems, lattice effects

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Dynamic freezing and defect suppression in the tilted one-dimensional Bose-Hubbard model (2014)

U. Divakaran and K. Sengupta

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2014-11-20

Description: Author(s): U. Divakaran and K. Sengupta We study the dynamics of a tilted one-dimensional Bose-Hubbard model for two distinct protocols using numerical diagonalization for a finite sized system (N≤18). The first protocol involves periodic variation of the effective electric field E seen by the bosons which takes the system twice (per driv... [Phys. Rev. B 90, 184303] Published Wed Nov 19, 2014

Keywords: Dynamics, dynamical systems, lattice effects

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