Solid State Physics Laboratory

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.

Coexistence of weak localization and a metallic phase in Si/SiGe quantum wells

Abstract: Magnetoresistivity measurements on p-type Si/SiGe quantum wells reveal the coexistence of a metallic behavior and weak localization. Deep in the metallic regime, pronounced weak localization reduces the metallic behavior around zero magnetic field without destroying it. In the insulating phase, a positive magnetoresistivity emerges close to B=0, possibly related to spin-orbit interactions.

Novel scheme to improve SnO2/SAW sensor performance for NO2 gas by detuning the sensor oscillator frequency

Abstract: A new method has been devised for obtaining fast NO2 gas sensing characteristics by using detuned SnO2/SAW sensor oscillator. The deposited SnO2 thin films were polycrystalline showing XRD reflections corresponding to (1 0 1) and (2 1 1) planes of rutile structure. The frequency of the sensor remained tuned for SnO2 layer of small thickness (

An Investigation of the Ground State of Cr$^{2+}$ in MgO Based on Thermal Conductivity Measurements

Abstract: Measurements of the thermal conductivity of MgO doped with chromium in the temperature range 0.4 to 300 K indicate the existence of resonant scattering by Cr 2+ ions at 5.2 and 21 cm -1 . These measurements confirm that the ion cannot be described by simple crystal field theory or by static Jahn-Teller theory, but they are consistent with the dynamic Jahn-Teller theory of Fletcher & Stevens (1969) with the parameters 8 (tunnelling frequency) = 16 cm -1 and D (spin-orbit splitting) = 4 cm -1 . It is not possible to determine the sign of the anharmonic term, B , from the measurements. These parameters differ significantly from those determined by Fletcher & Stevens and those determined by Ham (1971) from acoustic paramagnetic resonance data for Cr 2+ in MgO. The data also appear to confirm earlier indications that strong coupled mode effects are present. The scattering in a Ni-doped specimen was found to be largely due to the difference in mass between the Ni and Mg ions, whereas that in Fe-doped specimens was largely due to a process resonant at ca . 100 cm -1 .

Large Nuclear Spin Polarization in Gate-Defined Quantum Dots Using a Single-Domain Nanomagnet

Abstract: The electron-nuclei (hyperfine) interaction is central to spin qubits in solid state systems. It can be a severe decoherence source but also allows dynamic access to the nuclear spin states. We study a double quantum dot exposed to an on-chip single-domain nanomagnet and show that its inhomogeneous magnetic field crucially modifies the complex nuclear spin dynamics such that the Overhauser field tends to compensate external magnetic fields. This turns out to be beneficial for polarizing the nuclear spin ensemble. We reach a nuclear spin polarization of $\ensuremath{\simeq}50%$, unrivaled in lateral dots, and explain our manipulation technique using a comprehensive rate equation model.