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Institution

Solid State Physics Laboratory

FacilityDelhi, India
About: Solid State Physics Laboratory is a facility organization based out in Delhi, India. It is known for research contribution in the topics: Quantum dot & Dielectric. The organization has 1754 authors who have published 2597 publications receiving 50601 citations.


Papers
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Journal ArticleDOI
TL;DR: Recently, a lot of attention has been paid to infrared imaging using uncooled microbolometer detectors, primarily because of their low-cost, and wide military and civilian applications as mentioned in this paper.
Abstract: Recently, a lot of attention has been paid to infrared imaging using uncooled microbolometer detectors, primarily because of their low cost, and wide military and civilian applications This paper reviews the basic principles of these detectors and some of the important works done internationally in this field This paper presents some of the research work on titanium microbolometer carried out at Solid State Physics Laboratory, Delhi Defence Science Journal, 2009, 59(6), pp580-589 , DOI:http://dxdoiorg/1014429/dsj591562

96 citations

Journal ArticleDOI
TL;DR: In this article, the dependence of hyperfine fields at 0 \ifmmode^\circ\else\textdegree\fi{}K at octahedral ($B$) and tetrahedral ($A$) sites in ferrites on the kind of nearest neighbors is discussed in terms of supertransferred hyperfine field.
Abstract: The dependence of hyperfine fields at 0 \ifmmode^\circ\else\textdegree\fi{}K at ${\mathrm{Fe}}^{57}$ nuclei in octahedral ($B$) and tetrahedral ($A$) sites in ferrites on the kind of nearest neighbors is discussed in terms of supertransferred hyperfine fields ${H}_{\mathrm{S}\mathrm{}\mathrm{THF}}$. An expression for ${H}_{\mathrm{S}\mathrm{}\mathrm{THF}}$ involving the various covalency parameters is derived using the linear co involving the various covalency parameters is derived using the linear combination-of-atomic-orbitals (LCAO) method. From experimental results and the derived expression for ${H}_{\mathrm{S}\mathrm{}\mathrm{THF}}$, the various covalency parameters are determined for ${\mathrm{Fe}}^{3+}$ ions in both $A$ and $B$ sites. It is found that the ${\mathrm{Fe}}^{3+}$($A$)-${\mathrm{O}}^{2\ensuremath{-}}$ bond is considerably more covalent than the ${\mathrm{Fe}}^{3+}(B)\ensuremath{-}{\mathrm{O}}^{2\ensuremath{-}}$ bond and that the transfer of ${\mathrm{O}}^{2\ensuremath{-}}$ $2p$ electrons into ${\mathrm{Fe}}^{3+}$ $4s$ orbitals is proportional to the transfer into ${\mathrm{Fe}}^{3+}$ $3d$ orbitals. We have also found that the hyperfine fields in the various ferrimagnetic spinels can be explained to a large extent by considering only the changes in ${H}_{\mathrm{S}\mathrm{}\mathrm{THF}}$.

95 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present time-resolved measurements of electron transport through a quantum dot using a nearby quantum point contact as a charge detector, and they have used the framework of full counting statistics to model the experimental data.
Abstract: We present time-resolved measurements of electron transport through a quantum dot. The measurements were performed using a nearby quantum point contact as a charge detector. The rates for tunneling through the two barriers connecting the dot to source and drain contacts could be determined individually. In the high bias regime, the method was used to probe excited states of the dot. Furthermore, we have detected bunching of electrons, leading to super-Poissonian noise. We have used the framework of full counting statistics to model the experimental data. The existence of super-Poissonian noise suggests a long relaxation time for the involved excited state, which could be related to the spin relaxation time.

94 citations

Journal ArticleDOI
TL;DR: This work uses a linear triple-quantum-dot array to demonstrate a coherent time evolution of two interacting distant spins via a quantum mediator, which may provide a new route for scaling up spin qubit circuits using quantum dots, and aid in the simulation of materials and molecules with non-nearest-neighbour couplings.
Abstract: Coherent interactions at a distance provide a powerful tool for quantum simulation and computation. The most common approach to realize an effective long-distance coupling 'on-chip' is to use a quantum mediator, as has been demonstrated for superconducting qubits and trapped ions. For quantum dot arrays, which combine a high degree of tunability with extremely long coherence times, the experimental demonstration of the time evolution of coherent spin-spin coupling via an intermediary system remains an important outstanding goal. Here, we use a linear triple-quantum-dot array to demonstrate a coherent time evolution of two interacting distant spins via a quantum mediator. The two outer dots are occupied with a single electron spin each, and the spins experience a superexchange interaction through the empty middle dot, which acts as mediator. Using single-shot spin readout, we measure the coherent time evolution of the spin states on the outer dots and observe a characteristic dependence of the exchange frequency as a function of the detuning between the middle and outer dots. This approach may provide a new route for scaling up spin qubit circuits using quantum dots, and aid in the simulation of materials and molecules with non-nearest-neighbour couplings such as MnO (ref. 27), high-temperature superconductors and DNA. The same superexchange concept can also be applied in cold atom experiments.

94 citations

Journal ArticleDOI
TL;DR: In this article, the quasiharmonic free energy of (100), (110), and (111) surfaces within the slab model was computed for the surface instabilities of copper metal and it was shown that a loose-packed surface would melt prior to a close-packed one if contractive surface relaxations are neglected.
Abstract: The surface instabilities of copper metal are studied by computing the quasiharmonic free energy of (100), (110), and (111) surfaces within the slab model. We find that a loose-packed surface would melt prior to a close-packed one if contractive surface relaxations are neglected. The inclusion of surface contractions can reverse the order of these instabilities in agreement with recent experiments.

93 citations


Authors

Showing all 1757 results

NameH-indexPapersCitations
Alain Dufresne11135845904
Yang Ren7988026341
Klaus Ensslin7063821385
Werner Wegscheider6993321984
Takashi Takahashi6542414234
Liu Hao Tjeng6432213752
Nicholas E. Geacintov6345315636
Manfred Sigrist6146818362
Thomas Ihn6147514159
Takafumi Sato5926311032
Christoph Stampfer5931514422
Christian Colliex5828914618
Takashi Mizokawa5740011697
Eberhard Bodenschatz5737413208
Bertram Batlogg551909459
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20231
202210
202174
202087
201992
201878