Academics and Past Experience:
Bachelors: IIT Kanpur (CPI 9.3/10.0)
MS: Purdue Univ.
PhD in Condensed matter Physics - Purdue Univ. (GPA: 5.96/6.00)
Post Doctor at Max Planck Institute (Stuttgart)
Postdoc at NTT Basic Research labs (Japan)
Visiting Scientist at IMSc, Chennai
Asst. Prof. at IIT Delhi
Visiting Scientist at Texas Center for Superconductivity, Univ. of Houston
Visiting Fellow at Cavendish Lab, Univ. of Cambridge
Visiting Scholar at Argonne National Lab, USA
Fellowship at the Cavendish Lab (Univ. of Cambridge)
Our (Prof. B. Chakrabarti's and mine) joint proposal for Applied Mathematics and Computational Science
Center at SINP was selected and funded, after screening at IMSc (Chennai) and BARC (Mumbai) in 2004.
David Ross Fellowship at Purdue Univ.
Certificates of merit at IIT Kanpur
State Special Merit Scholarship for several years
National Science Talent Scholarship in Mathematics
Taught advanced courses in Condensed Matter Physics,
Many-body Physics, field theoretic methods in Condensed Matter Physics,
Magnetism, Fermi Liquid theory, etc. Also taught a course in Modern
Physics to undergraduates.
We derived a quasiparticle pseudo Hamiltonian of an infinitesimally
polarized electron gas
which fully takes into account the many-body effects of both charge and spin density
fluctuations. We calculated self-consistently Fermi liquid parameters like the effective
mass, the effective g-factor, spin susceptibility in two-dimensional systems and found
reasonable agreement with experiments. My works on electron gas [see especially PRB 38
10966 (1988); PRB 40 5432, (1990); PRB 49 7887 (1994); PRB 49 14188 (1994)] are
well recognized and distinguished scientists (including Nobel prize winners) cite these works.
In fact G. F. Giuliani and G. Vignale have written a book ["Quantum Theory of the
Electron Liquid" (Cambridge)] in which my work forms a major theme of the chapter
"The normal Fermi liquid" (Ch. 8).
I had included effects of electron-impurity interactions [PRB 44 13101 (1991)] and showed that
the magnetization instability (at filling factor 2 in the quantum Hall regime) predicted by Giuliani
and Quinnin [PRB 31 6228 (1985)] does occur; the experiment (measuring diagonal resistivity
in GaInAs-InP heterostructures) I proposed was carried out by K. von Klitzing et al. [Phys. Rev. B
47 4048 (1993)] and the instability was explicitly demonstrated. The prediction was also
verified by Mike Pepper et al. [PRL 79, 4449, (1997)] through activation transport studies.
Several Nobel prize winners (such as H. L. Stormer, D. C. Tsui, K. v. Klitzing, and
H. Kroemer) and Buckley award winners (such as J. K. Jain, A. H. MacDonald, and S. M. Girvin)
cite this work.
By using novel approaches, we (my student Sanjoy Datta and I) solved the
long-standing problem of analytically obtaining the Peierls instability condition in
the Holstein model [Phys. Rev. B 75, 035124 (2007) and Phys. Rev. B 71, 235118 (2005)]
and predicted the phase diagram away from half-filling.
We (my student Sanjoy Datta and
I) derived an effective d-dimensional Hamiltonian
for a system of hard-core-bosons coupled to optical phonons in a lattice. Away from half-filling,
we show that the presence of next-nearest-neighbor hopping in the effective Hamiltonian leads
to a striking superfluid-to-supersolid transition [Solid State Commun. 150 , 2040 (2010)].
1) "Quantum phase transition and phase diagram at a general filling
spinless one-dimensional Holstein model" at the International seminar
and workshop - (April 10--May 11, 2007) on the "Strong Correlations
and Angle-Resolved Photoemission Spectroscopy" at MPI-Dresden, Germany.
2) "Cooperative Electron-phonon Interactions in One Dimension" at the
Moments and Multiplets in Mott Materials program (Aug. 13--Dec. 14, 2007)
at KITP, Santa Barbara, USA.
3) "Cooperative Electron-phonon Interactions in One Dimension" at
Purdue Univ. (USA), Dec. 7 (2007).
4) "Cooperative Jahn-Teller effect in manganite chains", Oct. 22 (2007) at
TCM group seminar, Cavendish lab, Univ. of Cambridge (UK).
5) "Cooperative electron-phonon interactions in molecular chains"
at Imperial College (London, UK), Jan. 15 (2008).
6) "Cooperative Jahn-Teller effect in low-dimensional manganites"
at Univ. of Leicester (UK), Jan. 23 (2008).
7) "Cooperative electron-phonon interactions in molecular chains"
at Univ. of Bristol (UK) , Feb. 13 (2008).
8) "Magnetic-oxide nanoelectronics" at workshop on "Challenges
in nanoelectronics" at Saha Inst. on Nov. 27 (2008).
9) "Quantum phase transition in an anisotropic
Heisenberg model" at meeting on "Entanglement in quantum condensed
matter systems" in IMSc (Chennai), 1-2 Dec. 2008.
10) "Quantum phase transition due to cooperative electron-phonon interaction
in low-dimensional systems" at "Indian condensed matter workshop"
organized by ICTS of TIFR, 9-22 Dec. (2008).
11) "Supersolidity in a Bose-Holstein model" at the
Low Dimensional Electron Systems program (Jan. 20 -June 12, 2009)
at KITP, Santa Barbara, USA.
12) "Orbital ordering in undoped manganites via a generalized
at the ICTS CONDENSED MATTER PROGRAMME 2009, 5-22 Dec (2009).
13) "Supersolidity in a Bose-Holstein model" in the two-day
A. J. Leggett’s visit to SINP (27-28 Jan./2010).
14) "Phase diagram of the one-dimensional Hubbard-Holstein model" at
"International Conference-cum-School on Strongly Correlated and Disordered
Systems" held at IISc, Bangalore from Dec. 9 - 22, 2011.
15) "Study of maximal bipartite entanglement and robustness in
resonating-valence-bond states" at IMSC on 7/Dec./2011.
16) "Strong multiferroicity and giant magnetoelectric effect in
at the international conference on "Correlated Oxides: novel
quantum states, device physics and energy technologies"
March-April 2012, Cambridge Univ.
17) "Modeling multiferroicity in manganite heterostructures by
including cooperative electron-phonon interaction" at the
discussion meeting, entitled "New functionalities in electronic
and magnetic materials'', SSCU, IISc, October 18-20, 2012.
18) "Polaron dynamics and decoherence in an interacting
system coupled to optical phonon environment" at the "Meeting on
quantum information processing and applications'' Harish-Chandra
Research Institute, Allahabad (India), Dec. 2-8, 2013.
19) "Polaron dynamics and decoherence in an interacting
system coupled to optical phonon environment" at I.I.T. Madras
20) "An analysis of the extremely anisotropic next-nearest-neighbour
Heisenberg Model" at IMSC (Chennai) on 4/Feb./2014.
21) Key-note talk on "Oxide devices -- the next revolution'' at the
National Seminar (2014) on ``Recent Advances in Physics''
at Berhampur Univ. jointly organized by Berhampur Univ. and IOP (Bhubaneswar).
22) Colloquium on "Oxide electronics -- an answer to the
at IISER Bhopal on 4/Sept./2015.
23) "Oxide double quantum dot: an answer to the qubit problem?"
at the "Meeting on quantum information processing and applications"
Harish-Chandra Research Institute, Allahabad (India); Dec. 7-13 (2015).
24) "Oxide double quantum dot – an answer to the qubit problem?"
Condensed Matter Seminar, Physics dept., Purdue; 19/Feb./2016
25) "Oxide systems – an answer to the qubit problem?"
Material Science Seminar, Argonne National Lab; 2/March/2016
26) "Oxide systems – an answer to the qubit problem?"
Condensed Matter Seminar, Physics dept., Univ. of Illinois at Urbana-Champaign 10/March/16
27) Plenary lecture on "Oxide devices – the best replacement for semiconductor devices?'' at the
International meeting on ``Highly Correlated Systems-IMHCS-2017''
at Mahatma Gandhi Univ., Kerala, 24-26 March 2017.
"Phase diagram of one-dimensional Hubbard-Holstein model at
Sahinur Reja, Sudhakar Yarlagadda, Peter B. Littlewood,
Phys. Rev. B 84, 085127 (2011).
"Using many-body entanglement for coordinated action in game
Sudhakar Yarlagadda, Econophysics & Economics of Games, Social Choices and
Quantitative Techniques (NEW ECONOMIC WINDOWS , Springer 2010).
"Supersolidity for hard-core-bosons coupled to optical
Sanjoy Datta and Sudhakar Yarlagadda, Solid State Communications 150 , 2040 (2010).
"Orbital ordering in undoped manganites via a generalized
S. Yarlagadda, P. B. Littlewood, M. Mitra, R. K. Monu,
Phys. Rev. B 80, 235123 (2009).
"Cooperative electron-phonon interaction in molecular chains",
Sudhakar Yarlagadda, arXiv:0712.0366
"Phase transition and phase diagram at a general
the spinless one-dimensional Holstein Model",
Sanjoy Datta and Sudhakar Yarlagadda, Phys. Rev. B 75, 035124 (2007).
''Many-Polaron Effects in the Holstein Model'',
Sanjoy Datta, Arnab Das, and Sudhakar Yarlagadda, Phys. Rev. B, 71 235118 (2005).
''An analytic treatment of the Gibbs-Pareto behavior in
Arnab Das and Sudhakar Yarlagadda, Physica A, 353 529 (2005)
(cond-mat/0409329; old version cond-mat/0310343).
" Jahn-Teller polarons and their superconductivity in a molecular conductor",
R. Ramakumar and Sudhakar Yarlagadda, Phys. Rev. B, 69 104519 (2004).
" Holstein polarons, Frohlich coupling and superconductivity in a molecular conductor",
R. Ramakumar and Sudhakar Yarlagadda, Phys. Rev. B, 67 214502 (2003).
"Analytic treatment of a trading market model", Arnab
Das and Sudhakar Yarlagadda,
Physica Scripta T106 39 (2003).
" Microscopic approach to electron-phonon interaction physics
in half-doped manganites",
Sudhakar Yarlagadda, IJMPB 15 No. 27, 3529 (2001).
"Mean-field approach to charge, orbital, and spin
ordering in manganites",
Sudhakar Yarlagadda and C. S. Ting, IJMPB 15 2719 (2001).
"Colossal magnetoresistance using the small polaron
picture with finite band width effects",
Sudhakar Yarlagadda, Phys. Rev. B, 62 14828 (2000).
"Mixed charge-spin response functions of an arbitrarily
polarized electron gas",
Sudhakar Yarlagadda, Solid State Commun., 116 167 (2000).
Comment on "Spin dependent hopping and colossal
negative magnetoresistance in
epitaxial NdSrMnO3 films in fields upto 50T",
Sudhakar Yarlagadda, Phys. Rev. Lett., 84 4017 (2000).
"Screened interaction and self-energy in an
infinitesimally polarized electron gas via
Sudhakar Yarlagadda and G. F. Giuliani, Phys. Rev. B, 61 12556 (2000).
Selected Earlier Publications:
``Towards a new picture of the fractional quantum Hall
S. Yarlagadda, Physica B, 223-224, 640 (1996).
``Many-body local fields and Fermi liquid parameters in a quasi-two-dimensional electron liquid'',
S. Yarlagadda and G. F. Giuliani, Phys. Rev. B. 49, 14188 (1994).
``Landau theory of the Fermi liquids and the
S. Yarlagadda and G. F. Giuliani, Phys. Rev. B. 49, 14172 (1994).
``Quasiparticle pseudo hamiltonian of an infinitesimally polarized Fermi liquid'',
S. Yarlagadda and G. F. Giuliani, Phys. Rev. B. 49, 7887 (1994).
``Fermi liquid theory in the low density two-dimensional Hubbard model'',
S. Yarlagadda and S. Kurihara, Phys. Rev. B. 48, 10 567 (1993).
``Negative thermodynamic density of states and charge density wave
instability in the lowest Landau level'',
S. Yarlagadda, Phys. Rev. B 48, 4707 (1993).
``Magnetization instabilities at tilted magnetic fields in the quantum Hall regime'',
S. Yarlagadda, Phys. Rev. B 44, 13101 (1991).
``Nuclear spin relaxation due to a two-dimensional electron gas'',
S. Yarlagadda and R. R. Gerhardts,
Proceedings of the 20th International Conference on the Physics of Semiconductors, Thessaloniki, Greece,
edited by E.M. Anastassakis and J.D. Joannopoulos (World Scientific, Singapore, 1990), p. 993.
``Many-body local fields and quasiparticle renormalization effects in two dimensional electronic systems'',
S. Yarlagadda and G. F. Giuliani, Surface Science,
229, 410 (1990).
``Spin susceptibility in a two-dimensional electron gas'',
S. Yarlagadda and G. F. Giuliani, Phys. Rev. B 40, 5432 (1989).
``Exact asymptotic behavior of the charge and spin susceptibilities in an interacting Fermi liquid'',
S. Yarlagadda and G. F. Giuliani, Phys. Rev. B 39, 3386 (1989).
``Quasiparticle energy and interaction in a normal electron liquid'',
S. Yarlagadda and G. F. Giuliani, Solid State Commun. 69, 677 (1989).
``Many-body effective mass and anomalous g factor in inversion layers'',
S. Yarlagadda and G. F. Giuliani, Phys. Rev. B 38, 10966 (1988).
One of the editors of proceedings of the International
Conference on Strongly Correlated
Electron Systems (SCES-Y2k) published in IJMPB 15 Nos. 19&20 (2001).
One of the editors of proceedings of the International Workshop on Econophysics of
Wealth Distributions (Springer 2005).
Current Research Interests:
Manganite physics (CMR, charge, orbital, and spin ordering,
etc.), Transition metal oxides in general,
Oxide heterostructures, Hubbard-Holstein model, Study of coexisting long-range orders (e.g., superconductivity
and charge-density-wave), Molecular superconductivity, Econophysics, Quantum computation and
quantum information, Many-body effects in electron gas, Quantum Hall effect, Fermi liquid theory,
and Many-body physics in general.
Argonne National Lab:
Prof. Peter Littlewood
Prof. G.F. Giuliani
Prof. A. W. Overhauser
Texas Center for Superconductivity, Univ. of Houston:
Prof. C.S. Ting
Max Planck Inst., Stuttgart:
Prof. K. von Klitzing
Prof. G. Baskaran
Prof. P. Majumdar