S. Satpathy

University of Missouri

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B. R. K. Nanda

Indian Institute of Technology Madras

Mohammad Sherafati

Medical College of Wisconsin

Sayantika Bhowal

ETH Zurich

Hakim Meskine

Tsinghua University

Churna Bhandari

Iowa State University

K. V. Shanavas

Oak Ridge National Laboratory

Mohammad Mahdi Valizadeh

University of Islamic Studies

Subodha Mishra

Siksha O Anusandhan University

Z. Popović

University of Missouri

Pratik Sahu

Indian Institute of Technology Madras

Cooperative Institutions

University of Missouri

Indian Institute of Technology Madras

Max Planck Society

Max Planck Institute for Solid State Research

University of Illinois Urbana-Champaign

Indian Institute of Technology Delhi

University of Gothenburg

Stanford University

Indian Institute of Science Bangalore

University of Belgrade

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Effect of Broken Time-Reversal Symmetry on the Interaction Between Two Localized Magnetic Moments in a Host Solid

Bulletin of the American Physical Society (2015)

Mohammad Mahdi Valizadeh S. Satpathy

T-symmetry

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Electronic structure ofBa3CuSb2O9: A candidate quantum spin liquid compound

Physical Review B (2014)

K. V. Shanavas Zorica Popović S. Satpathy

Using density-functional methods, we study the electronic structure of ${\mathrm{Ba}}_{3}\mathrm{Cu}{\mathrm{Sb}}_{2}{\mathrm{O}}_{9}$, a candidate material for the quantum spin liquid behavior. We study both the triangular lattice as well as the recently proposed hexagonal lattice structures with flipped Cu-Sb dumbbells. The band structure near the Fermi energy is described very well by a tight-binding Hamiltonian involving the Cu (${e}_{g}$) orbitals, confirming their central role in the physics of the problem. A minimal tight-binding Hamiltonian for the triangular structure is presented. The Cu (${d}^{9}$) ions (a single ${e}_{g}$ hole in the band structure) present in the compound are expected to be Jahn-Teller centers, while the nature of the Jahn-Teller distortions in this material is still under debate. Solving a simple model by exact diagonalization, we show that electronic correlation effects in general enhance the tendency towards a Jahn-Teller distortion by reducing the kinetic energy due to correlation effects. Our density-functional calculations do indeed show a significant Jahn-Teller distortion of the $\mathrm{Cu}{\mathrm{O}}_{6}$ octahedra when we include the correlation effects within the Coulomb-corrected GGA+U method, so that the Jahn-Teller effect is correlation driven. We argue for the presence of a random static Jahn-Teller distortion in the hexagonal structure rather than a dynamical one because of the broken octahedral symmetry around the $\mathrm{Cu}{\mathrm{O}}_{6}$ octahedra and the potential fluctuations inherently present in the system caused by a significant disorder, which is believed to be present, in particular, due to the flipped Cu-Sb dumbbells.

Jahn–Teller effect

Hamiltonian (control theory)

Tight binding

10.1103/physrevb.89.085130

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Citations (17)

Erratum: Eigenstates of Wannier excitons near a semiconductor surface

Physical review. B, Condensed matter (1986)

S. Satpathy

The paper contained the following misprints:(1) After Eq. ( 14), k2= -a2E is the correct definition of k2.(2) (a/2) should be replaced by (2a) in Eqs. ( 23) and ( 24).(3) (2a/k) should be replaced by (a/k) in the definition of a in the line following Eq. ( 16).All calculations reported in the original paper were performed with the correct equations and all numerical results and con- clusions remain unchanged.

Wannier function

Biexciton

10.1103/physrevb.33.8791.3

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Electric Field Tuning of the Rashba Effect

Bulletin of the American Physical Society (2013)

Shanavas Veedu S. Satpathy

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Pressure-induced resonance broadening of exciton line shapes in semiconductors: Direct determination of intervalley scattering rates in GaAs

Physical review. B, Condensed matter (1991)

S. Satpathy M. Chandrasekhar H. R. Chandrasekhar U. D. Venkateswaran

We show that the exciton photoluminescence line shape in the GaAs/${\mathrm{Al}}_{\mathit{x}}$${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$As quantum wells under pressure is broadened by hybridization of the \ensuremath{\Gamma} exciton with the X and the L continua via electron-phonon coupling. Furthermore, we demonstrate the pressure tuning of the resonance-broadening effect which can be used to extract the electron-phonon coupling parameters directly. For GaAs we estimate the intervalley electron-phonon deformation potential ${\mathit{D}}_{\mathrm{\ensuremath{\Gamma}}\mathit{X}}$ to be 10.7\ifmmode\pm\else\textpm\fi{}0.7 eV/\AA{}. The resonance effect should be observable in other semiconductors as well.

Line (geometry)

10.1103/physrevb.44.11339

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Citations (18)

Electronic Structure and Magnetism in La_1-xCa_xMnO_3: %Mean-field Study of a Model Hamiltonian

APS March Meeting Abstracts (1996)

S. Satpathy Saswat Mishra Rahul Pandit

Hamiltonian (control theory)

Magnetism

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One-dimensional photonic crystal: The Kronig-Penney model

Physical review. B, Condensed matter (2003)

Subodha Mishra S. Satpathy

We formulate the photonic band-structure problem for a one-dimensional photonic crystal in terms of the reflection and transmission coefficients, obtaining a transcendental photonic band equation. The reflection and the transmission coefficients may be evaluated by using the standard transfer-matrix method. The structure of the equation reveals the existence of gaps, analogous to the Kronig-Penney model in the electronic band-structure problem. As an example, the photonic band equation is solved for the simple case of the ``Kronig-Penney'' dielectric structure, consisting of alternating slabs of refractive indices ${n}_{1}$ and ${n}_{2}.$

Reflection

Transfer-matrix method (optics)

Transcendental equation

Yablonovite

Transfer matrix

Kramers–Kronig relations

10.1103/physrevb.68.045121

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Citations (45)

Coulomb Catastrophe and the Origin of the Sheet Carrier Density at the n-type LaAlO$_3$/SrTiO$_3$ interface: What do band calculations tell us?

Bulletin of the American Physical Society (2009)

Zoran Popović S. Satpathy Richard Martin