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Doubling of Landau levels in GaAs/AlGaAs heterostructures
Keshav N. Shrivastava
Usually the Landau levels are given by (n+1/2)\hbarω_c with \hbarω_c=eB/mc. We find that there are clusters of electrons with localization so that the orbital angular momentum is n…
Microwave resonance in 2D Wigner crystals
Keshav N. Shrivastava
Recent experimental measurements of the microwave absorption in the frequency range 1-4 GHz show peaks at several values of the filling factor,ν=nh/eB. Since the filling factor mul…
Clustering in quantum Hall effect: Spin-charge coupling
Keshav N. Shrivastava
The effective fractional charges like 17/4 or 19/4 are explained by our angular momentum theory. These fractions do not arise from the odd denominator rule. Due to spin polarizatio…
Comments on `` Scattering of bunched fractionally charged quasiparticles" by Chung, Heiblem and Umansky, cond-mat/0305325
Keshav N. Shrivastava
In the experiments, the quantity measurd is the product of the charge and the magnetic field from which fractional charge is deduced. There is no objection to measuring the fractio…
New Resonances Along with Cyclotron Resonance in Heterostructures
Keshav N. Shrivastava
The usual cyclotron resonance occurs at ω_c=eB/m*c which is independent of spin. The new resonances depend on spin. The new resonances occur at ω_{c\pm}=(1/2)g_{\pm}eB/m*c where (1…
Thermoelectric power in between two plateaus in quantum Hall effect
Keshav N. Shrivastava
We have considered the response at two energies corresponding to two plateaus in the quantum Hall effect. Since the thermoelectric power involves the derivative of conductivity wit…