G. Baskaran
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View article: Boson bloom
Boson bloom Open
The year 2024 marks the 100th anniversary of the first article on Bose statistics. Bose breathed life into the Planck distribution of radiation by a microscopic derivation (Bose 1924 Z. Phys. 26 178), adding a new insight, namely indisting…
View article: Metastable Kitaev Spin Liquids in Isotropic Quantum Heisenberg Magnets
Metastable Kitaev Spin Liquids in Isotropic Quantum Heisenberg Magnets Open
Metastable states with surprising properties abound in Hilbert space. We study unfrustrated isotropic spin-\half Heisenberg models in honeycomb lattice and find emergence of \textit{metastable Kitaev spin liquids having a 2-spin nematic lo…
View article: Broad Band Mott Localization is all you need for Hot Superconductivity: Atom Mott Insulator Theory for Cu-Pb Apatite
Broad Band Mott Localization is all you need for Hot Superconductivity: Atom Mott Insulator Theory for Cu-Pb Apatite Open
A hypothetical non-dimerized Cu chain in equilibrium is a spin-\half atom Mott insulator (AMI), eventhough its band width is high ~ 10 eV. This RVB reservoir has a large exchange coupling J ~ 2 eV. This idea of, \textit{broad band Mott loc…
View article: Being the Carer in the Household: A Study on the Role of Gender in Care Narratives
Being the Carer in the Household: A Study on the Role of Gender in Care Narratives Open
The word ‘Carer’ is mostly associated with a woman and an image that pop up in one’s mind while reading its definition. It has been socially constructed that nurturing a child, nursing the sick and caring for the needy are all the responsi…
View article: Study of Style and Stylistics in Farley Mowat's People of the Deer
Study of Style and Stylistics in Farley Mowat's People of the Deer Open
The article attempts to evaluate Farley Mowat's People of the Deer in terms of style and stylistic perspectives. Mowat (1921- 2014) is a well-known Canadian author. In the usage of the language resource, he has exhibited an excellent degre…
View article: Wohlleben Effect and Emergent Pi junctions in superconducting Boron doped Diamond thin films
Wohlleben Effect and Emergent Pi junctions in superconducting Boron doped Diamond thin films Open
Diamond is an excellent band insulator. However, boron (B) doping is known to induce superconductivity. We present two interesting effects in superconducting B doped diamond (BDD) thin films: i) Wohlleben effect (paramagnetic Meissner effe…
View article: J. Robert Schrieffer (1931–2019)
J. Robert Schrieffer (1931–2019) Open
With the passing away of Robert Schrieffer a few days ago, one of the pioneering figures in modern theoretical physics is no more. Schrieffer, as a Ph D student, working with his mentor John Bardeen and postdoctoral colleague Leon Cooper, …
View article: Singlet Reservoir Theory of Ambient Tc Granular Superconductivity in Monovalent Metal Nanostructures
Singlet Reservoir Theory of Ambient Tc Granular Superconductivity in Monovalent Metal Nanostructures Open
Monovalent metals contain half filled band (HFB) of s-electrons. Emphasizing importance of Coulomb repulsions in HFB in 2D and 1D monovalent systems we sketched a theory (2018) for ambient temperature granular superconductivity reported by…
View article: Theory of Confined High Tc Superconductivity in Monovalent Metals
Theory of Confined High Tc Superconductivity in Monovalent Metals Open
Monovalent non-transition metals are robust Fermi liquids. They defy superconductivity even at lowest temperatures (Li is a minor exception:Tc $\approx$ 0.4 mK). However, Thapa and Pandey \cite{ThapaPandey} have recently reported signals f…
View article: Resonating valence bonds and spinon pairing in the Dicke model
Resonating valence bonds and spinon pairing in the Dicke model Open
Resonating valence bond (RVB) states are a class of entangled quantum many body wavefunctions with great significance in condensed matter physics. We propose a scheme to synthesize a family of RVB states using a cavity QED setup with two-l…
View article: Report on 1803.03267v1
Report on 1803.03267v1 Open
Resonating valence bond (RVB) states are a class of entangled quantum many body wavefunctions with great significance in condensed matter physics.We propose a scheme to synthesize a family of RVB states using a cavity QED setup with two-le…
View article: Theory of Emergent Josephson Lattice in Neutral Twisted Bilayer Graphene (Moiŕe is Different)
Theory of Emergent Josephson Lattice in Neutral Twisted Bilayer Graphene (Moiŕe is Different) Open
`More is Different' (Anderson, 1972) in graphene. A bilayer and a twist spring surprises. Recently discovered superconductivity (T$_c\approx$ 1.7 K) at an ultra low doping density $\sim 10^{11}$cm${}^{-2}$ has alerted the community to look…
View article: Resonating Valence Bond Theory of Superconductivity: Beyond Cuprates
Resonating Valence Bond Theory of Superconductivity: Beyond Cuprates Open
Resonating valence bond (RVB) theory of high Tc superconductivity, an electron correlation based mechanism, began as an insightful response by Anderson, to Bednorz and Muller's discovery of high Tc superconductivity in cuprates in late 198…
View article: Generating resonating-valence-bond states through Dicke subradiance
Generating resonating-valence-bond states through Dicke subradiance Open
Dicke's original thought experiment with two spins coupled to a photon mode has recently been experimentally realized. We propose extending this experiment to N spins and show that it naturally gives rise to highly entangled states. In par…
View article: Valence Bond Order and Antiferromagnetism in Silicene - ab initio Results
Valence Bond Order and Antiferromagnetism in Silicene - ab initio Results Open
Silicene and Graphene are similar and have $π$-$π^*$ bands. However band width in silicene is only a third of graphene. It results in a substantial increase in the ratio of Hubbard U to band width W, U/W $\sim$ 0.5 in graphene to $\sim 1$ …
View article: Theory of Ultra Low Tc Superconductivity in Bismuth: Tip of an Iceberg ?
Theory of Ultra Low Tc Superconductivity in Bismuth: Tip of an Iceberg ? Open
Superconductivity with an ultra low Tc $\sim$ 0.5 mK was discovered recently in bismuth, a semimetal. To develop a model and scenario for Bi we begin with a cubic reference lattice, close to A7 (dimerized cubic) structure of Bi. Three vale…
View article: Two Mott Insulator Theory of Superconductivity in K$_3$X (X: picene, .. p-terphenyl, .. C$_{60}$)
Two Mott Insulator Theory of Superconductivity in K$_3$X (X: picene, .. p-terphenyl, .. C$_{60}$) Open
We look for unifying aspects behind superconductivity in aromatic hydrocarbon and fullerene family K$_3$X (X: picene, .. p-terphenyl, .. C$_{60}$). Aromatic hydrocarbon molecules support RVB states. Consequent stability (aromaticity) makes…
View article: My Random Walks in Anderson's Garden
My Random Walks in Anderson's Garden Open
Anderson's Garden is a drawing presented to Philip W. Anderson on the eve of his 60th birthday celebration, in 1983. This cartoon (Fig. 1), whose author is unknown, succinctly depicts some of Anderson's pre-1983 works, as a blooming garden…
View article: RVB States in doped Band Insulators from Coloumb forces: Theory and a case study of Superconductivity in BiS$_2$ Layers
RVB States in doped Band Insulators from Coloumb forces: Theory and a case study of Superconductivity in BiS$_2$ Layers Open
Doped band insulators, HfNCl, WO$_3$, diamond, Bi$_2$Se$_3$, \bis2 families, STO/LAO interface, gate doped SrTiO$_3$ and MoS$_2$ etc. are unusual superconductors. With an aim to build a general theory for superconductivity in doped band in…
View article: Elements of Syncretism in Nayantara Sahgal's Mistaken Identity
Elements of Syncretism in Nayantara Sahgal's Mistaken Identity Open
In the novel Mistaken Identity, Nayantara Sahgal rivets her focus on syncretism, a phenomenon that is very delicate, especially in a country having a diversified culture like India. Her concern for a united nation caught within the clutche…
View article: Emergent Mott Insulators and Possibility of High Tc Superconductivity in Pressurized Molecular Solids, H2S, SiH4, H2 etc
Emergent Mott Insulators and Possibility of High Tc Superconductivity in Pressurized Molecular Solids, H2S, SiH4, H2 etc Open
Paired valence electrons forming covalent bonds in molecues are confined cooper pair correlations. High pressure dissociates molecules in solid H2S, SiH4, H2 etc. and form extended structures. However, valence electrons are resilient and c…
View article: Majorana Fermi Sea in Insulating SmB6: A proposal and a Theory of Quantum Oscillations in Kondo Insulators
Majorana Fermi Sea in Insulating SmB6: A proposal and a Theory of Quantum Oscillations in Kondo Insulators Open
In an exciting development, SmB6, a Kondo insulator has been shown to exhibit bulk quantum oscillations. We propose that SmB6 is a bulk scalar Majorana Fermi Liquid} (MFL) with a finite gap for charge and spin excitations. In their study o…