How To Download Gate Response Sheet [Extra Quality]
Vinnie Marlborough
The GATE 2023 examination was held on 4, 5, 11, and 12 February 2023 in eight sessions. Candidates may submit their contests on the answer keys provided for a very limited time period against a payment. They will be allowed to raise objections against the GATE 2023 answer key between February 22 to 25. Candidates can use the GATE 2023 response sheet and answer key to estimate their probable marks before the results are declared.
According to the schedule, the GATE 2023 response sheet will be released tomorrow and will be uploaded on the candidate portal on the official website. The response sheet includes the answers marked by the candidates for all the sections. With the help of the response sheets, candidates will be able to check their overall marks obtain in the Gate examination.
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The Indian Institute of Technology (IIT) Bombay has released the response sheet of GATE 2021. Candidates will have to log in to the official website gate.iitb.ac.in with their credentials in order to download the response sheet.
Candidates will be able to download the IIT Kanpur GATE 2023 response sheet from the website - gate.iitkgp.ac.in. To download the GATE 2023 response sheet, candidates will have to use their IIT Kanpur GATE exam enrollment ID and password.
As per the schedule, the response sheet will be uploaded on the candidate portal. The GATE 2023 response sheet contains the answers marked by the candidates for all the sections. With the help of the response sheet and answer key, candidates can calculate their possible marks in the exam.
GATE 2023 response sheet for the GATE Mechanical, CS, PH, CY, MT, ECE, EE, CE, MN, BT, ST, CH, XE, XH, XL, MN, and more is released on February 15. Candidates can download the same from the link given below.
GATE 2023 Response Sheet- IIT Kanpur released the response sheet of GATE on February 15, 2023, on the official website gate.iitk.ac.in. When the response sheet is released, candidates receive a notification on their registered mobile numbers regarding the declaration of the official response sheet for GATE 2023. In order to download the GATE 2023 response sheet, candidates must use GATE 2023 login credentials - enrolment/email ID and password. GOAPS 2023 link has been given on this page for downloading the GATE 2023 response sheet.
The response sheet of GATE 2023 constitutes the responses filled in by the candidates in their answer papers. Using the official GATE answer key and response sheet 2023, candidates can foretell their possible marks in the GATE 2023 entrance exam. Candidates who have appeared for the GATE 2023 entrance exam will be able to download the GATE 2023 response sheet for future purposes. Candidates looking for the GATE 2023 response sheet for computer science (CSE), electrical engineering (EE), electronics & communication (ECE), chemistry (CY), chemical engineering (CH), civil engineering (CE), mechanical engineering,(ME), etc can access them since it is released.
A growing number of two-dimensional superconductors are being discovered in the family of exfoliated van der Waals materials. Due to small sample volume, the superfluid response of these materials has not been characterized. Here, we use a local magnetic probe to directly measure this key property of the tunable, gate-induced superconducting state in MoS2. We find that the backgate changes the transition temperature non-monotonically whereas the superfluid stiffness at low temperature and the normal state conductivity monotonically increase. In some devices, we find direct signatures in agreement with a Berezinskii-Kosterlitz-Thouless transition, whereas in others we find a broadened onset of the superfluid response. We show that the observed behavior is consistent with disorder playing an important role in determining the properties of superconducting MoS2. Our work demonstrates that magnetic property measurements are within reach for superconducting devices based on exfoliated sheets and reveals that the superfluid response significantly deviates from simple BCS-like behavior.
A growing family of atomically thin superconductors is realized by mechanically exfoliated sheets of van der Waals (vdW) materials. These include two-dimensional (2D) superconductors based on bulk superconducting materials such as NbSe29,10, NbS211, and TaS212, as well as 2D superconductors that are induced by electrostatic gating such as MoS213, WS214,15, MoTe216, WTe217,18, twisted bilayer graphene19, and ABC stacked trilayer graphene20. A variety of superconducting phenomena have been observed in atomically thin vdW superconductors, such as robustness against large in-plane magnetic fields21,22,23, superconductivity in the vicinity of correlated electronic states19,20, a dramatically enhanced Tc in the monolayer limit12,16, and unusual symmetry breaking in the superconducting state24. A detailed study of the transport properties of NbSe2 with varying thickness has shown that dissipationless transport is highly fragile to temperature, applied magnetic field and the employed bias current25 further highlighting the need for directly probing the phase coherence of the superconducting state in vdW materials. However, due to the typically small sample size, only a few measurements beyond electronic transport which directly probe the superconducting state below Tc are available26,27, and no characterization of the magnetic response has been reported for any atomically thin vdW superconductor.
\(T_c^R\) and \(T_c^\chi \) both have a non-monotonic dependence on VBG for device A and B, which is also directly visible in the data in Fig. 2. In device B, the superconducting transition broadens as VBG decreases, which is reflected in the growing difference between the two temperatures. In contrast to the non-monotonic dependencies of \(T_c^R\) and \(T_c^\chi \), the superfluid response increases monotonically with increasing VBG doping, whereas the normal-state resistance decreases.
To highlight how the temperature dependence of χ evolves as a function of VBG, we normalize the superfluid response versus temperature curves in Fig. 4. The vertical axis is scaled by the superfluid response at 0.9 and 0.55 \(T_c^\chi \) for device A and B, respectively. The horizontal axis is scaled by \(T_c^\chi \). For device A, the curves collapse. Conversely, in device B, the curves differ in the range of 0.7 to 1.0 \(T_c^\chi \).
For device A, the deviation of the superfluid response from Eq. (2) is likely caused by phase fluctuations. That is, the kink in χ(T) results from a BKT jump in ρs(T) slightly broadened by the interplay of finite-size and disorder effects. Although device B does not show a similarly clear feature, it is likely that similar effects are at play. For a given system size, within the disorder-modified BKT paradigm we expect that stronger disorder (i.e., decreasing VBG) will cause the superfluid response to become more shallow close to Tc38, which is what we observe. This behavior is also consistent with the generally stronger disorder in device B compared to device A as indicated by the normal-state carrier mobility. Therefore, our data suggest that MoS2 represents a crossover system, where the superfluid stiffness near Tc is governed by phase fluctuations, but a clear signature of a BKT transition may or may not be present depending on doping and other parameters.
In conclusion, we report the first characterization of the superfluid response of an atomically thin van der Waals superconductor using a local probe that provides sufficient sensitivity to the small sample volume typical in this material family. We find that the superfluid stiffness monotonically increases at low temperatures as the backgate is tuned, even when the critical temperature decreases. Our analysis suggests that our devices are in the dirty limit of superconductivity in which the superfluid stiffness responds to changes in device resistivity. This demonstrates that disorder plays an important role even in crystalline 2D superconductors. Further, we observe direct signatures of a BKT transition in one device, whereas, in another, the universal jump is replaced by a broad region of suppressed superfluid response close to Tc. This demonstrates that a clear BKT transition is not ubiquitous in these systems, but can be substantially obscured by disorder. In the present work, our 4 K base temperature prevented characterizing χ at a small fraction of Tc. Future work extending to lower temperatures will be sensitive to the presence of nodes in the superconducting gap, which would be a sign of an unconventional order parameter26,39,40,41.
We found that a common failure mode of the experiments was delamination of the ionic liquid at low temperatures causing catastrophic damage to the device. These events were often correlated with temperature changes at a finite backgate voltage. Therefore, we adopted the following procedure for our measurement: slow warming and cooling rates of
The SQUID signal exhibits a small non-zero phase with respect to the field coil drive even far away from a sample. This is likely due to a small parasitic impedance in the electronics and wiring. This effect is negligible on the in-phase response from a superconducting sample. However, its effect on the out-of-phase response can be substantial, because that part is small or zero. Therefore, we characterized the phase shift with the SQUID far away from the sample at all frequencies and rotated the collected data to correct this effect. After this rotation, no out-of-phase response was observed in the data reported in this work.
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