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Amitabh Joshi Anuranjan Anand Balasubramanian Sundaram C. P. Rajendran C.N.R Rao 
C.N.R Rao Chandrabhas Narayana Diwakar S. Venkatesan Eswaramoorthy MG.U. Kulkarni 
Ganesh Subramanian Govindaraju T H Ila Hemalatha Balaram James P. Clement Chelliah 
Jayanta Haldar K. B. Sinha K.S. Narayan Kanishka Biswas Kaustuv Sanyal 
Kavita Jain Krishnan V.Kundu Tapas K.M. R. S. Rao Maneesha Inamdar 
Meheboob Alam Meher K. Prakash Namita Surolia Narasimha Roddam Premkumar Senguttuvan 
Rajesh Ganapathy Ranjan Datta Ranjani Viswanatha Ravi Manjithaya S. N. Bhat 
Santosh Ansumali Santosh Ansumali Sarit S. Agasti Sebastian C Peter Sheeba Vasu 
Shivaprasad S. M.Shobhana Narasimhan Sreenivas K. R.Sridhar Rajaram Srikanth Sastry 
Subi Jacob George Subir K. Das Sundaresan A.Swapan Pati Tapas Kumar Maji 
Udaykumar Ranga Umesh V. Waghmare Valdiya K. S.Vidhyadhiraja N. S.Vidya T. N. C. 

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  1. Sudeshna Sen and N. S. Vidhyadhiraja, Protocols for characterising quantum transport through nano-structures, Applied Physics Letters 101, 133106 (2012).

  2. Monojit Bag, N. S. Vidhyadhiraja and K. S. Narayan, Fluctuations in Photocurrent of Bulk Heterojunction Polymer Solar Cells – A Valuable Tool to Understand Microscopic and Degradation Processes, Applied Physics Letters 101, 043903 (2012). ,

    Commentary:  The first experimental observations of current noise in organic bulk-heterojunction solar cells are reported and analysed. The noise spectrum has a usual 1/fa form at low frequencies. At frequencies of ~ 8-10kHz, a broad maximum shows up. This intriguing feature is a direct evidence of hidden cyclostationary processes in the system. The maximum depends strongly on the background intensity, the extent of degradation and temperature. A kinetic Monte Carlo (KMC) simulation of charge transport in a disordered system has been carried out to understand the results. The inclusion of a transport level or a mobility edge is the new feature of simulations. The flicker noise is well reproduced, and the maximum is argued to arise from space-charge effects.



  3. Nagamalleswararao Dasari, P Mandal, A Sundaresan and N S Vidhyadhiraja, Weak ferromagnetism and magnetization reversal in YFe1-xCrxO3, Europhysics Letters 99, 17008 (2012). ,

    Commentary: YFe1-xCrxO3  is an unusual system. It is a solid solution of the Yttrium orthoferrite and orthochromite materials. The end points (YFeO3 and YCrO3) are boring canted anti-ferromagnets with a monotonic temperature dependent magnetization. The alloy, however, shows rich and unexpected behaviour such as magnetization reversal and compensation point(s). It turns out that the origin of such surprising behaviour is a three-way Dzyaloshinskii-Moriya interaction between Fe-Fe, Cr-Cr and Fe-Cr. Given that the first two are in the same direction, but the third is opposite, the whole range of experimental behaviour can be accounted for, in a quantitative way, using a simple minimalist theoretical approach. Read on.



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